Transcript
Ordering number : EN6507B
STK672-080-E Thick-Film Hybrid IC
Unipolar Constant-current Chopper (external excitation PWM) Circuit with Built-in Microstepping Controller
http://onsemi.com
Stepping Motor Driver (sine wave drive) Output Current 2.8A (no heat sink*) Overview The STK672-080-E is a stepping motor driver hybrid IC that uses power MOSFETs in the output stage. It includes a built-in microstepping controller and is based on a unipolar constant-current PWM system. The STK672-080-E supports application simplification and standardization by providing a built-in 4 phase distribution stepping motor controller. It supports five excitation methods: 2 phase, 1-2 phase, W1-2 phase, 2W1-2 phase, and 4W1-2 phase excitations, and can provide control of the basic stepping angle of the stepping motor divided into 1/16 step units. It also allows the motor speed to be controlled with only a clock signal. The use of this hybrid IC allows designers to implement systems that provide high motor torques, low vibration levels, low noise, fast response, and high-efficiency drive. This product is provided in a smaller package than earlier STK672-050-E for easier mounting in end products.
Applications • Facsimile stepping motor drive (send and receive) • Paper feed and optical system stepping motor drive in copiers • Laser printer drum drive • Printer carriage stepping motor drive • X-Y plotter pen drive • Other stepping motor applications
Note*: Conditions: VCC1 = 24V, IOH = 2.0A, 2W1-2 excitation mode.
Semiconductor Components Industries, LLC, 2013 June, 2013
61108HKIM/52004TN(OT)/22002TN(OT) No.6507-1/18
STK672-080-E Features • Can implement stepping motor drive systems simply by providing a DC power supply and a clock pulse generator. • One of five drive types can be selected with the drive mode settings (M1, M2, and M3) 1) 2 phase excitation drive 2) 1-2 phase excitation drive 3) W1-2 phase excitation drive 4) 2W1-2 phase excitation drive 5) 4W1-2 phase excitation drive • Phase retention even if excitation is switched. • Provides the MOI phase origin monitor pin. • The CLK input counter block can be selected to be one of the following by the high/low setting of the M3 input pin. 1) Rising edge only 2) Both rising and falling edges • The CLK input pin includes built-in malfunction prevention circuits for external pulse noise. • ENABLE and RESET pins provided. These are Schmitt trigger inputs with built-in 20kΩ (typical) pull-up resistors. • No noise generation due to the difference between the A and B phase time constants during motor hold since external excitation is used. • Microstepping operation supported even for small motor currents, since the reference voltage Vref can be set to any value between 0V and 1/2VCC2. • External excitation PWM drive allows a wide operating supply voltage range (VCC1 = 10 to 45V) to be used. • Current detection resistor (0.15Ω) built-in the hybrid IC itself. • Power MOSFETs adopted for low drive loss. • Provides a motor output drive current of IOH = 2.8A. (at Tc = 105°C)
Specifications Absolute Maximum Ratings at Ta = 25°C Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage 1
VCC1 max
No signal
52
V
Maximum supply voltage 2
VCC2 max
No signal
-0.3 to +7.0
V
VIN max
Logic input pins
-0.3 to +7.0
V
Output current
IOH max
0.5s, 1 pulse, with VCC1 applied
Repeated avalanche capacity
Ear max
Allowable power dissipation
Pd max
Operating IC substrate temperature
Tc max
Junction temperature
Tj max
Storage temperature
Tstg
Input voltage
θc-a = 0
3.3
A
30
mJ
8
W
105
°C
150
°C
-40 to +125
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Allowable Operating Ranges at Ta = 25°C Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage 1
VCC1
With signals applied
10 to 45
V
Supply voltage 2
VCC2
With signals applied
5 ± 5%
V
0 to VCC2
V
100 (min)
V
2.8
A
3
A
Input voltage
VIH
Phase driver withstand voltage
VDSS
Tr1, 2, 3, and 4 (the A, A, B, and B outputs)
Output current 1
IOH1
Tc = 105°C, CLK ≥ 200Hz
Output current 2
IOH2
Tc = 80°C, CLK ≥ 200Hz
No.6507-2/18
STK672-080-E Electrical Characteristics at Tc = 25°C, VCC1 = 24V, VCC2 = 5V Parameters
Symbols
Rating
Conditions min
Control supply current
ICC
Output saturation voltage
Vsat
Average output current
Ioave
FET diode forward voltage
Vdf
Pin 6, with ENABLE pin held low. RL = 12Ω Load: R = 3.5Ω / L = 3.8mH For each phase
unit
typ
0.445
If = 1A
max 2.1
14
mA
0.65
1
V
0.5
0.56
A
1
1.5
V
[Control Inputs] Input voltage
Input current
VIH
Except for the Vref pin
VIL
Except for the Vref pin
1
V
IIH
Except for the Vref pin
0
1
10
μA
IIL
Except for the Vref pin
125
250
510
μA
2.5
V
415
545
μA
0.4
V
4
V
[Vref Input Pin] Input voltage
VI
Pin 7
Input current
II
Pin 7, 2.5V input
330
VOH
I = –3mA, pins MOI
2.4
VOL
I = +3mA, pins MOI
2W1-2, W1-2, 1-2
Vref
θ = 1/8
100
%
2W1-2, W1-2
Vref
θ = 2/8
92
%
2W1-2
Vref
θ = 3/8
83
%
2W1-2, W1-2, 1-2
Vref
θ = 4/8
71
%
2W1-2
Vref
θ = 5/8
55
%
2W1-2, W1-2
Vref
θ = 6/8
40
%
2W1-2
Vref
θ = 7/8
2
Vref
0
[Control Outputs] Output voltage
V
[Current Distribution Ratio (A·B)]
PWM frequency
fc
37
21
%
100
%
47
57
kHz
Note: A constant-voltage power supply must be used. The design target value is shown for the current distribution ratio.
Package Dimensions unit:mm (typ) 4186 46.6 8.5
12.7
3.6
2.0 14 2.0=28
0.5
4.0
15
1
(6.6)
1.0
25.5
41.2
0.4 2.9
No.6507-3/18
9
M2
ENABLE 15
MOI 14
RESET 13
M3 12
CLOCK 11
CWB 10
8
M1
RC oscillator
Excitation state monitor
Rise/fall detection and switching
Excitation mode control
Reference clock generation
Phase advance counter
PWM control
Phase excitation drive signal generation
Pseudo-sine wave generator
–
+
–
+
SUB
7
6
Current distribution ratio switching
Vref
VCC2 5
A 4
AB 3
B 2
BB
1
PG
STK672-080-E
Internal Block Diagram
A13256
No.6507-4/18
STK672-080-E Test Circuit Diagrams Vsat
Vdf VCC2
VCC1 6
6 Start 11
5 4 3
8
2
9
RL
A
5
AB
4
B
3
BB
2
STK672-080-E
Vref=2.5V
A AB B BB
STK672-080-E
7 V
V
VCC2 13
+
1
1 A A13257 A13258
IIH, IIL
Ioave, ICC, fc VCC1 VCC2
VCC2
A M1 M2 M3 IIH
CLK A
CWB
IIL
RESET ENABLE A 2.5V
Vref
b a
a
6
6
b
Start
8
11
5
8
4
SW1
A
9 12
9 11
3 STK672-080-E
10 13 14
AB B
SW2
STK672-080-E Vref
7
ENABLE
15
2
BB VCC1
SW3
15 7
+
fc
13 1
1
A13259
A
A13260
For Ioave measurement: Set switch SW1 to the b position, provide the Vref input and switch over switch SW2. For fc measurement: Set SW1 to the a position, set Vref to 0V, and switch over switch SW3. For ICC measurement: Set the ENABLE input to the low level.
No.6507-5/18
STK672-080-E Power-on Reset The application must perform a power-on reset operation when VCC2 power is first applied to this hybrid IC. Application circuit that used 2W1-2 phase excitation (microstepping operation) mode.
VCC2=5V
6 5 14 8 VCC2=5V
14 9
3
12 14
2
Two-phase stepping motor
AB B
+
BB
15
ENABLE VF 0.3V
4
A
11
CLK RESET +
100μF or higher
VCC1=10V to 45V
SG
STK672-080-E 1
PG
13
CBW
10
MOI
14
VCC2=5V We recommend a value of about 100Ω for Ro2 to minimize the influence of the Vref pin internal impedance, which is 6kΩ RoX: Input impedance: 6kΩ ±30%
Ro1 Simple power on reset circuit (This circuit cannot be used for power supply voltage drop detection.)
7
RoX
Vref Ro2
A13261
Setting the Motor Current The motor current IOH is set by the Vref voltage on the hybrid IC pin 7. The following formula gives the relationship between IOH and Vref. RoX = (Ro2 × 6kΩ) ÷ (Ro2 + 6kΩ) Vref = VCC2 × RoX ÷ (Ro1 + RoX)
(1) (2)
1 × Vref (3) K Rs K: 4.7 (Voltage divider ratio), Rs: 0.15Ω (This is the hybrid IC's internal current detection resistor. It has a tolerance of ±3%.)
IOH =
Applications can use motor currents from the current (0.05 to 0.1A) set by the duty of the frequency set by the oscillator up to the limit of the allowable operating range, IOH = 2.8A Ioave
IOL
IOH
0A Motor current waveform
A13262
Function Table M2 M1 M3
0
0
1
1
0
1
0
1
Phase switching clock edge timing
1
2 phase excitation
1-2 phase excitation
W1-2 phase excitation
2W1-2 phase excitation
Rising edge only
0
1-2 phase excitation
W1-2 phase excitation
2W1-2 phase excitation
4W1-2 phase excitation
Rising and falling edges
Forward
Reverse
ENABLE
Motor current is cut off when low
0
1
RESET
Active low
CWB
No.6507-6/18
STK672-080-E Functional Description External Excitation Chopper Drive Block Description VCC1
IOFF
Enable φA (control signal)
ION
Current divider
L2
L1
Vref
A=1
CR oscillator
Divider
800kHz 45kHz S
Q Latch circuit
D1 MOSFET
R
–
Noise filter
+
AND
Rs A13263
Driver Block Basic Circuit Structure Since this hybrid IC adopts an external excitation method, no external oscillator circuit is required. When a high level is input to φA in the basic driver block circuit shown in the figure and the MOSFET is turned on, the comparator + input will go low and the comparator output will go low. Since a set signal with the PWM period will be input, the Q output will go high, and the MOSFET will be turned on as its initial value. The current ION flowing in the MOSFET passes through L1 and generates a potential difference in Rs. Then, when the Rs potential and the Vref potential become the same, the comparator output will invert, and the reset signal Q output will invert to the low level. Then, the MOSFET will be turned off and the energy stored in L1 will be induced in L2 and the current IOFF will be regenerated to the power supply. This state will be maintained until the time when an input to the latch circuit set pin occurs. In this manner, the Q output is turned off and on repeatedly by the reset and set signals, thus implementing constant current control. The resistor and capacitor on the comparator input are spike removal circuit elements and synchronize with the PWM frequency. Since this hybrid IC uses a fixed frequency due to the external excitation method and at the same time also adopts a synchronized PWM technique, it can suppress the noise associated with holding a position when the motor is locked. Input Pin Functions Pin No.
Symbol
11
CLK
Phase switching clock
Function
Built-in pull-up resistor CMOS Schmitt trigger input
Pin circuit type
10
CWB
Rotation direction setting (CW/CCW)
Built-in pull-up resistor CMOS Schmitt trigger input
15
ENABLE
Output cutoff
Built-in pull-up resistor CMOS Schmitt trigger input
8, 9, 12
M1, M2, M3
Excitation mode setting
Built-in pull-up resistor CMOS Schmitt trigger input
13
RESET
System reset
Built-in pull-up resistor CMOS Schmitt trigger input
7
Vref
Current setting
Input impedance 6kΩ (typ.) ±30%
No.6507-7/18
STK672-080-E Input Signal Functions and Timing • CLK (phase switching clock) 1) Input frequency range: DC to 50kHz 2) Minimum pulse width: 10μs 3) Duty: 40 to 60% (However, the minimum pulse width takes precedence when M3 is high.) 4) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure 5) Built-in multi-stage noise rejection circuit 6) Function: - When M3 is high or open: The phase excited (driven) is advanced one step on each CLK rising edge. - When M3 is low: The phase is advanced one step by both rising and falling edges, for a total of two steps per cycle. CLK Input Acquisition Timing (M3 = Low) CLK input
System clock
Phase excitation counter clock
Excitation counter up/down
Control output timing
Control output switching timing A13264
• CWB (Method for setting the rotation direction) 1) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure 2) Function: - When CWB is low: The motor turns in the clockwise direction. - When CWB is high: The motor turns in the counterclockwise direction. 3) Notes: When M3 is low, the CWB input must not be changed for about 6.25μs before or after a rising or falling edge on the CLK input. • ENABLE (Controls the on/off state of the A, A, B, and B excitation drive outputs and selects either operating or hold as the internal state of this hybrid IC.) 1) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure 2) Function: - When ENABLE is high or open: Normal operating state - When ENABLE is low: This hybrid IC goes to the hold state and excitation drive output (motor current) is forcibly turned off. In this mode, the hybrid IC system clock is stopped and no inputs other than the reset input have any effect on the hybrid IC state.
No.6507-8/18
STK672-080-E • M1, M2, and M3 (Excitation mode and CLK input edge timing selection) 1) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure 2) Function: M2 M1 M3
0
0
1
1
0
1
0
1
Phase switching clock edge timing
1
2 phase excitation
1-2 phase excitation
W1-2 phase excitation
2W1-2 phase excitation
Rising edge only
0
1-2 phase excitation
W1-2 phase excitation
2W1-2 phase excitation
4W1-2 phase excitation
Rising and falling edges
3) Valid mode setting timing: Applications must not change the mode in the period 5μs before or after a CLK signal rising or falling edge. Mode Setting Acquisition Timing CLK input
System clock
Mode setting
M1 to M3
Mode switching clock
Mode switching timing
Hybrid IC internal setting state
Phase excitation clock
Excitation counter up/down A13265
• RESET (Resets all parts of the system.) 1) Pin circuit type: Built-in pull-up resistor (20kΩ, typical) CMOS Schmitt trigger structure 2) Function: - All circuit states are set to their initial values by setting the RESET pin low. (Note that the pulse width must be at least 10μs.) At this time, the A and B phases are set to their origin, regardless of the excitation mode. The output current goes to about 71% after the reset is released. 3) Notes: When power is first applied to this hybrid IC, Vref must be established by applying a reset. Applications must apply a power on reset when the VCC2 power supply is first applied. • Vref (Sets the current level used as the reference for constant-current detection.) 1) Pin circuit type: Analog input structure 2) Function: - Constant-current control can be applied to the motor excitation current at 100% of the rated current by applying a voltage less than the control system power supply voltage VCC2 minus 2.5V. - Applications can apply constant-current control proportional to the Vref voltage, with this value of 2.5V as the upper limit. Output Pin Functions Pin No.
Symbol
Function
Pin circuit type
14
MOI
Phase excitation origin monitor
Standard CMOS structure
Output Signal Functions and Timing • A, A, B, and B (Motor phase excitation outputs) 1) Function: - In the 4 phase and 2 phase excitation modes, a 3.75μs (typical) interval is set up between the A and A and B and B output signal transition times.
No.6507-9/18
STK672-080-E Phase States During Excitation Switching • Excitation phases before and after excitation mode switching 2W1-2 phase → 1-2 phase
2W1-2 phase → 2 phase A 0
3
28 27 25
28
B 24 8 B
5 8 B
12
20
12
16
9
11 12
20 17
19
A 0
4
28 26
6
28
4
B 24
B 24 8 B 12
29
4 28 0 4 24
18
14
18 16
2
3 5
25
8 B
8
23
10 12
A 0
B 9 11
19
14
13 17
15 A
1-2 phase → W1-2 phase
1-2 phase → 2 phase
7
21
A
A
1
30 0 2 28 4 26 6 24 22 8 20 10 18 12 16 14
B
16
31
27 6
20
12
W1-2 phase → 2W1-2 phase A
20 12 16
22
10
20
A 0
30
26
1-2 phase → 2W1-2 phase
A
A
30
2
1
29
4
28
B 24
A
W1-2 phase → 1-2 phase
2
28
20
A 30 31 0 1 2 3 29 4 28 5 27 30 0 2 26 6 28 4 25 26 7 6 B 24 24 8 8 B 22 10 23 20 9 12 18 16 14 22 10 11 21 12 20 13 19 18 17 161514
A
W1-2 phase → 2 phase
22
15
16
16 A
30
4
28 0 4 8 24
4
B 24 20
A
31
1
2W1-2 phase → W1-2 phase
28
4
20
12
5 0
26
28
B 8 B
20 22
6
4
25 B
12 16
B
B
8 20 12 16
10
9
21
12
20
28 0 4 24
18
16
13
14
17
A
A
A
2 phase → W1-2 phase
2 phase → 1-2 phase A 0
2 phase → 2W1-2 phase
A
A
30
29 5 6
B 24
28
4
20
12
B 8 B 22
28
4
20
12
28
4
20
12
B B
B
21 14
16 A
A
13 17 A
Excitation phase according to the first clock input pulse after changing the excitation mode setting (M1 and M2) Excitation phase immediately before setting the excitation mode A13266
No.6507-10/18
STK672-080-E • Excitation phases before and after excitation mode switching 2W1-2 phase → 1-2 phase
2W1-2 phase → 2 phase 31
A 0 28
2W1-2 phase → W1-2 phase
A 0 1
29
4 5
28
4
7
B 24
25 B 24
8 B
20
23
28 0 4 8 24 16
21 20 15
16
12 13
1716 A
A
A
W1-2 phase → 1-2 phase
W1-2 phase → 2 phase A 0
30
8 B 9
12
20
12
6
28
4
B 24 8 B
20 12 16
12
22
22
5
B 8 B 10
23
A 0
14
13 17
15 A
1-2 phase → 2W1-2 phase A
30
30
2
3
4 28
4
20
12
26 B 8 B 22
B 9 11
19
A
28
7
21
1-2 phase → W1-2 phase
1-2 phase → 2 phase
B 24
3
A
A
1
30 0 2 28 4 26 6 24 22 8 20 10 18 12 16 14
25 8
31
27
12 18 16
14
29 6
20 16
A 4
28 0 4 24
26 B 24
W1-2 phase → 2W1-2 phase
A 0 2
30 28
20
A 30 31 0 1 2 3 29 4 28 5 27 30 0 2 26 6 28 4 25 26 7 6 B 24 24 8 8 B 22 10 23 20 9 1816 1412 22 10 11 21 20 12 13 19 18 17 161514
20 16
27
6
28 0 4 24
28 0 4 24
B B
12
B
8 20 12 16
23
10
7
11
12
20
19
14
18
16 A
15 A
A 2 phase → W1-2 phase
2 phase →1-2 phase A 0
2 phase → 2W1-2 phase
A
A 2 3 27
B 24
26
4
28 20
12
B 8 B
28
4
20
12
B B 10
28
4
20
12
B 11
16 A
19
18 A
A A13267
No.6507-11/18
STK672-080-E Excitation Time and Timing Charts • CLK rising edge operation 2 Phase Excitation Timing Chart (M3 = 1)
1-2 Phase Excitation Timing Chart (M3 = 1) 1
M1 0
M1 0
M2 0
M2 0
1 M3 0
M3 0
1
CLK A A
CLK A A
B B
B B
MOSFET Gate Signal
RESET CWB
MOSFET Gate Signal
RESET CWB
MOI
100%
100%
71%
71%
Vref A 100% 71%
Comparator Reterence Voltage
Comparator Reterence Voltage
MOI
Vref A 100% 71%
Vref B
Vref B
W1-2 Phase Excitation Timing Chart (M3 = 1)
2W1-2 Phase Excitation Timing Chart (M3 = 1) 1
M1 0
M1 0
M2 0
1
M2 0
1
M3 0
1 1
M3 0
RESET CWB
CLK A A B B MOI
CLK MOSFET Gate Signal
MOSFET Gate Signal
RESET CWB
A A B B MOI
100% 92%
40%
Vref A 100% 92% 71% 40%
Vref B
Comparator Reterence Voltage
Comparator Reterence Voltage
71%
100% 92% 83% 71% 55% 40% 20%
Vref A 100% 92% 83% 71% 55% 40% 20%
Vref B A13268
No.6507-12/18
STK672-080-E • CLK rising and falling edge operation 1-2 Phase Excitation Timing Chart (M3 = 0)
W1-2 Phase Excitation Timing Chart (M3 = 0) 1
M1 0
M1 0
M2 0
M2 0
M3 0
M3 0
CLK A A B B
CLK A A B B
MOI
MOI
100%
100% 92%
71%
71%
Vref A 100% 71%
Comparator Reterence Voltage
Comparator Reterence Voltage
MOSFET Gate Signal
RESET CWB
MOSFET Gate Signal
RESET CWB
40%
Vref A 100% 92% 71% 40%
Vref B
Vref B
2W1-2 Phase Excitation Timing Chart (M3 = 0)
4W1-2 Phase Excitation Timing Chart (M3 = 0) 1
M1 0
M1 0
M2 0
1
M2 0
M3 0
M3 0
1
RESET CWB
CLK A A B B MOI
CLK
100% 92% 83% 71% 55% 40% 20%
Vref A
100% 92% 83% 71% 55% 40% 20%
Vref B
MOSFET Gate Signal
A A B B MOI
Comparator Reterence Voltage
Comparator Reterence Voltage
MOSFET Gate Signal
RESET CWB
97%100% 88% 92% 77% 83% 71% 66% 55% 48% 40% 31% 14% 20%
Vref A
97%100% 88% 92% 77% 83% 66% 71% 48% 55% 40% 31% 14% 20%
Vref B
A13269
No.6507-13/18
STK672-080-E Thermal Design The main elements internal to this hybrid IC with large average power losses are the current control devices, the regenerative current diodes, and the current detection resistor. Since sine wave drive is used, the average power loss during microstepping drive can be approximated by applying a waveform factor of 0.64 to the square wave loss during 2 phase excitation. The losses in the various excitation modes are as follows. 2 phase excitation
·fclock I Pd2EX = (Vsat+Vdf) · fclock · IOH · t2 + OH · (Vsat · t1+Vdf · t3) 2 2
1-2 phase excitation
Pd1-2EX = 0.64 · {(Vsat+Vdf) ·
·fclock I fclock · IOH · t2 + OH · (Vsat · t1+Vdf · t3)} 4 4 ·fclock I fclock ·IOH · t2 + OH · (Vsat · t1+Vdf · t3)} 8 8
W1-2 phase excitation PdW1-2EX = 0.64 · {(Vsat+Vdf) ·
·fclock I 2W1-2 phase excitation Pd2W1-2EX = 0.64 · {(Vsat+Vdf) · fclock ·IOH · t2 + OH · (Vsat · t1+Vdf · t3)} 16 16 4W1-2 phase excitation Pd4W1-2EX = 0.64 · {(Vsat+Vdf) ·
I OH ·fclock fclock ·IOH · t2 + · (Vsat · t1+Vdf · t3)} 16 16
Here, t1 and t3 can be determined from the same formulas for all excitation methods.
t1 =
VCC 1 + 0.35 t3 = − L · n ( ) R I OH ·R + VCC 1 + 0.35
−L · n (1 – R + 0.35 · IOH) R + 0.35 VCC 1
However, the formula for t2 differs with the excitation method. 2 phase excitation
t2 =
W1-2 phase excitation t2 =
2 fclock
– (t1+t3)
1-2 phase excitation
7 – t1 fclock
t2 =
2W1-2 phase excitation 4W1-2 phase excitation
3 fclock
t2 =
– t1
15 – t1 fclock
IOH
t3
t1
t2
A13270
Motor Phase Current Model Figure (2 Phase Excitation) fclock Vsat Vdf IOH t1 t2 t3
: CLK input frequency (Hz) : The voltage drop of the power MOSFET and the current detection resistor (V) : The voltage drop of the body diode and the current detection resistor (V) : Phase current peak value (A) : Phase current rise time (s) VCC1 : Supply voltage applied to the motor (V) : Constant-current operating time (s) L : Motor inductance (H) : Phase switching current regeneration time (s) R : Motor winding resistance (Ω)
No.6507-14/18
STK672-080-E Determine θc-a for the heat sink from the average power loss determined in the previous item. Tc max: Hybrid IC substrate temperature (°C) Tc max Ta θc-a = [°C/W] Ta: Application internal temperature (°C) Pd EX PdEX: Hybrid IC internal average loss (W) Determine θc-a from the above formula and then size S (in cm2) of the heat sink from the graphs shown below. The ambient temperature of the device will vary greatly according to the air flow conditions within the application. Therefore, always verify that the size of the heat sink is adequate to assure that the Hybrid IC back surface (the aluminum plate side) will never exceed a Tc max of 105°C, whatever the operating conditions are. θc-a - Pd
16
12
nt
8
40° C
60 °C 4
50°C
No. Fin 25.5 (°C/W)
0 0
2
4
6
10
12
14
16
2m mA l pl at e
10 7
(fla
5
t bl ack
3
(no
sur
Vertical standing type Natural convection air cooling sur f
fac
ace
fin ish )
e fi nis h
)
2
1.0 8
θc-a - S
2
Heat sink thermal resistance, θc-a - °C/W
θc-a= Tc max -- Ta (°C/W) Pd Tc max=105°C bie am ed nte ure ara rat Gu mpe te
Heat sink thermal resistance, θc-a - °C/W
20
No. Fin 25.5 (°C/W) 10
IC internal average power loss, Pd - W
2
3
5
7
100
2
3
5
Heat sink surface area, S - cm2
Next we determine the usage conditions with no heat sink by determining the allowable hybrid IC internal average loss from the thermal resistance of the hybrid IC substrate, namely 25.5°C/W. For a Tc max of 105°C at an ambient temperature of 50°C
PdEX = 105 - 50 = 2.15W 25.5
For a Tc max of 105°C at an ambient temperature of 40°C
PdEX = 105 - 40 = 2.54W 25.5
This hybrid IC can be used with no heat sink as long as it is used at operating conditions below the losses listed above. (See ΔTc – Pd curve in the graph on page 17.) The junction temperature, Tj, of each device can be determined from the loss Pds in each transistor and the thermal resistance θj-c. Tj = Tc + θj-c × Pds (°C) Here, we determine Pds, the loss for each transistor, by determining PdEX in each excitation mode. Pds = PdEX/4 The steady-state thermal resistance θj-c of a power MOSFET is 15.6°C/W.
No.6507-15/18
STK672-080-E fc - VCC2
53
51
51
PWM frequency, fc - kHz
53
49 47 45 43 41
47 45 43 41 39
37
37 4.5
5.0
5.5
1.2
0 =1 Tc
0.8
C 5° 5 =2 Tc
°C
0.6 0.4 0.2
0.5
1.0
1.5
2.0
2.5
3.0
Motor current, IOH - A
40
60
80
100
Substrate temperature, Tc - °C
120 ITF02415
Vdf - IOH
1.4
C 25° Tc=
1.2
°C 105 Tc=
1.0 0.8 0.6 0.4 0.2 0 0
3.5
0.5
1.0
1.5
2.0
2.5
Motor current, IOH - A
ITF02416
IOH - VCC1
2.5
20
1.6
1.4
1.0
0
ITF02414
Vsat - IOH
1.6
0 0
35
6.0
Supply voltage, VCC2 - V
Output saturation voltage, Vsat - V
49
39
35 4.0
fc - Tc
55
Internal diode forward voltage, Vdf - V
PWM frequency, fc - kHz
55
3.0 ITF02417
IOH - Tc
2.5
IOH=2 2.0
Motor current, IOH - A
Motor current, IOH - A
2.0
1.5
1.0
1.5
IOH=1A
1.0
0.5
0.5
Vref=0 0 0
10
20
30
40
Motor voltage, VCC1 - V
0
50
0
20
40
IVref - Vref
350
=2 Tc
300
C 5°
250 200 150 100 50 0 0
80
100
120 ITF02419
IVref - Tc
450
Reference voltage input current, IVref - μA
Reference voltage input current, IVref - μA
450 400
60
Substrate temperature, Tc - °C
ITF02418
Vref=2.5V
400 350
Vref=2V
300 250 200
Vref=1V
150 100 50 0
0.5
1.0
1.5
Reference voltage, Vref - V
2.0
2.5 ITF02420
0
20
40
60
80
Substrate temperature, Tc - °C
100
120 ITF02421
No.6507-16/18
STK672-080-E Vref - IOH
2.0
Reference voltage, Vref - V
Substrate temperature increase, ΔTc - °C
Test motor: PK264-02B VCC1=24V
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2
70 60 50 40 30 20 10 0
0 0
0.5
1.0
1.5
2.0
Motor current, IOH - V
0
2.5
0.5
1.0
1.5
2.0
2W1-2ex
Motor current, IOH - A
3.0
40
2ex
30
20
10
VCC1 : 24V Test motor : PK264-02B Motor current : IOH : 2-phase excitation: 1.5A 2W1-2 phase excitation: 2A With no heat sink
0 100
2
3
5 7 1k
2
3
Ho ld
2.5
CLK frequency, PPS - Hz
2
3
5 7 100k ITF02424
3.5
00Hz
mo de
2.0
1.5
1.0
Motor voltage: 24V Motor resistance (R): 0.4Ω Inductance (L): 1.2mH
0.5
5 7 10k
3.0
3.5
CLK ≥ 2 50
2.5
Hybrid IC internal average power dissipation, Pd - W ITF02423 Motor Current I OH Derating Curves vs. Operating Substrate Temperature Tc.
ITF02422
Substrate Temperature Rise Test
60
Substrate temprature increase, ΔTc - °C
ΔTc - Pd
80
0 0
20
40
60
80
100
Operating substrate temprature, Tc - °C
120 ITF02425
Notes • The current ranges shown above apply when the output voltage is not in the avalanche range. • The operating substrate temperature Tc values shown above are measured during motor operation. Since Tc varies with the ambient temperature Ta, the value of IOH, and whether IOH is continuous or intermittent, it must be measured in an actual operating system.
No.6507-17/18
STK672-080-E
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PS No.6507-18/18
