Transcript
ADP1853-EVALZ User Guide UG-431
One Technology Way P.O. Box 9106 Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 www.analog.com
Evaluation Board for the ADP1853 Step-Down DC-to-DC Controller FEATURES
ADP1853 DEVICE DESCRIPTION
Input voltage range: 9 V to 15 V Output voltage: 3.3 V Output current: up to 20 A Switching frequency: 300 kHz Operates in PWM or PSM Designed for evaluation of the ADP1853 functionality Flexible and easy to re-configure and modify
The ADP1853 is a step-down switching controller with integrated drivers for N-channel synchronous power MOSFETs. The switching frequency of the ADP1853 can be synchronized to an external clock signal applied to the SYNC input. The ADP1853 has a clock output, CLKOUT, which can be used for synchronizing other controllers. The CLKOUT frequency is the same as the switching and it is 180° out of phase.
EVALUATION BOARD DESCRIPTION
In addition, the boost diode is integrated into the ADP1853, thus lowering the overall system cost and component count. The ADP1853 can be set to operate in pulse skip, high efficiency mode (PSM) under light load, or in PWM continuous conduction mode.
This document describes the design, operation, and test results of the ADP1853-EVALZ. The input voltage range for this evaluation board is 9 V to 15 V, and the regulated output voltage VOUT is set to 3.3 V with the maximum output current up to 20 A. The switching frequency (fSW) of 300 kHz is set to achieve high efficiency.
The ADP1853 includes externally adjustable soft start, output overvoltage protection, externally programmable current limit, power good, tracking function, and a programmable oscillator frequency that ranges from 200 kHz to 1.5 MHz. The ADP1853 has the reference voltage accuracy of ±1% from −40°C to +125°C junction temperature. This controller can be powered from a 2.75 V to 20 V supply and is available in a 20-lead 4 mm × 4 mm LFCSP package.
ADP1853 EVALUATION BOARD VIN+ TERMINAL
GND TERMINAL
VOUT+ TERMINAL
Figure 1.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 12
10831-001
ADP1853
UG-431
ADP1853-EVALZ User Guide
TABLE OF CONTENTS Features .............................................................................................. 1
Output Capacitors .........................................................................3
Evaluation Board Description......................................................... 1
MOSFET Selection ........................................................................3
ADP1853 Device Description ......................................................... 1
Test Results .........................................................................................4
ADP1853 Evaluation Board ............................................................ 1
Evaluation Board Operating Instruction .......................................5
Revision History ............................................................................... 2
Other Information About the Evaluation Board PCB Layout ....6
Component Design .......................................................................... 3
Evaluation Board Schematics and Artwork ...................................7
ADIsimPower Design Tool ......................................................... 3
Ordering Information .................................................................... 10
Inductor Selection ........................................................................ 3
Bill of Materials ........................................................................... 10
Input Capacitors ........................................................................... 3
REVISION HISTORY 6/12—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADP1853-EVALZ User Guide
UG-431
COMPONENT DESIGN ADIsimPower DESIGN TOOL
OUTPUT CAPACITORS
The ADP1853 is supported by the ADIsimPower™ design tool set. ADIsimPower is a collection of tools that produce complete power designs optimized to a specific design goal. The tools allow the user to generate a full schematic, bill of materials, and calculate performance in minutes. ADIsimPower can optimize designs for cost, area, efficiency, and parts count while taking into consideration the operating conditions and limitations of the IC and all real external components. The ADIsimPower tool can be found at www.analog.com/ADIsimPower and the user can request an unpopulated board through the tool.
A combination of a 330 µF POSCAP™ polymer capacitor and a 22 µF MLCC is selected for the output rail. Polymer capacitors have low ESR and high current ripple rating. Connecting polymer capacitors and MLCCs in parallel is very effective in reducing voltage ripple.
For information about selecting power components and calculating component values, see also the ADP1853 data sheet.
INDUCTOR SELECTION The selected inductor is a Coilcraft SER1412-102ME with 1 µH inductance, and 32 A saturation current. This shielded inductor with a flat wire windings core provides exceptionally low DCR of 1.3 mΩ (typical).
INPUT CAPACITORS
MOSFET SELECTION For low output or low duty cycle, select a high-side MOSFET with fast rise and fall times and with low input capacitance to minimize charging and switching power loss. As for the synchronous rectifier (low-side MOSFET), select a MOSFET with low RDSON because it conducts current most of the time during the switching cycle and contributes larger portion in the conductive losses than the high-side MOSFET. For the high-side MOSFET, the BSC052N03LS from Infineon in the PG-TDSON-8 package is selected. This part has low input capacitance (770 pF typical) and fast transition times (typical turn-on delay is 2.4 ns). For the low-side MOSFET, the BSC090NS from Infineon, with the RDSON of 3.5 mΩ (maximum at VGS of 4.5 V) is selected.
Because of the low ESR and high input current rating of a multilayer ceramic capacitor (MLCC), a 10 µF MLCC is selected as the input capacitor close to the high-side power MOSFET. In addition, a 150 µF bulk OS-CON™ capacitor (aluminum solid capacitor with conductive polymer) from Sanyo is chosen for filtering out any unwanted low frequency noise from the input power supply.
Rev. 0 | Page 3 of 12
UG-431
ADP1853-EVALZ User Guide
TEST RESULTS TA = 25°C. 100
DH
90 80 3
EFFICIENCY (%)
70
DL
60 1
50
VOUT_AC
40 2
30
CLKOUT 20 PULSE SKIP FORCED PWM 1
10
4
100
LOAD (A)
10831-002
0 0.1
CH1 5V BW CH2 100mV CH3 10V BW CH4 5V BW
B
W
M10µs A CH4
625MS/s 1.6ns/pt 2.6V
10831-005
10
Figure 5. Switching Waveforms, Light Load of 0.5 A, fOSC = 300 kHz, Pulse Skip Enabled, SYNC Low
Figure 2. Efficiency, VIN = 12 V, VOUT = 3.3 V, fOSC = 300 kHz
0.05 SYNC
0.04 1
LINE REGULATION (%)
0.03 0.02
SW
0.01
3
0 CLKOUT
–0.01 –0.02
4
VOUT_AC
–0.03 2
9
10
11
12
13
14
15
INPUT VOLTAGE (V)
CH1 5V BW CH2 200mV CH3 10V BW CH4 5V BW
Figure 3. Line Regulation, VOUT = 3.3 V, fSW = 300 kHz, 20 A Load
B
W
M2µs 1.25GS/s IT 40.0ps/pt A CH1 2.9V
10831-006
–0.05
10831-003
–0.04
Figure 6. Switching Waveforms, 20 A Load, fSYNC = 300 kHz
0.4
LOAD CURRENT
0
–0.2
4
VOUT_AC
2
–0.6 0
5
10
15
20
LOAD CURRENT (A)
Figure 4. Load Regulation, VIN = 12 V, VOUT = 3.3 V, fSW = 300 kHz
CH2 200mV BW CH4 5A Ω BW
M100µs 125MS/s A CH4 14.4A
8.0ns/pt
Figure 7. VOUT Transient Response, 20 A to 10 A Load Step
Rev. 0 | Page 4 of 12
10831-007
–0.4
10831-004
LOAD REGULATION (%)
0.2
ADP1853-EVALZ User Guide
UG-431
EVALUATION BOARD OPERATING INSTRUCTION 1. 2. 3.
Connect Jumper JP2 (EN) with a shunt to the low position (disabled) Connect Jumper JP1 (FRQ) with a shunt to the low position for 300 kHz operation. Connect Jumper JP5 (SYNC) with a shunt to the high position for PWM operation or to the low position for pulse skip operation at light load.
4. 5.
Connect a power supply to the board input terminals VIN+ and GND and apply 12 V. Connect Jumper JP2 (EN) to the high position to enable the ADP1853.
Table 1. Jumper Description Jumper JP1
Description FRQ
Default Factory Setting Low
JP2 JP5
EN SYNC
Low Low
Function Connect shunt low for 300 kHz or high for 600 kHz switching frequency operation. The ADP1853-EVALZ is configured for operation at 300 kHz. Connect JP1 low. Connect shunt high to enable the ADP1853 or low to disable it. Connect shunt high for PWM or low for pulse skip operation. For synchronization, remove the shunt from JP5 and apply an external clock to the TP12 SYNC.
Table 2. Performance Summary (TA = 25°C) Parameter VIN fSW VOUT IOUT VOUT Ripple, DC Load VOUT Deviation upon Step Load Release
Condition 9 V to 15 V Switching frequency, 300 kHz 3.3 V 0 A to 20 A 90 mV at 20 A load 5% with 10 A step load
Rev. 0 | Page 5 of 12
UG-431
ADP1853-EVALZ User Guide
OTHER INFORMATION ABOUT THE EVALUATION BOARD PCB LAYOUT As seen in Figure 1, the layout of this evaluation board is not optimized for the smallest PCB area. It is laid out in such a way that any of the components can be desoldered and replaced easily with different components by using a hand soldering iron so that the user can modify the existing design without acquiring a new PCB layout. The physical size of the compensation components is 0603, which is selected for its ease of hand soldering when reworking the board is needed. The size of these components can be smaller in an actual design. Note that there are extra place holders for the output filter capacitors, high-side and low-side MOSFETs, and the input ceramic decoupling capacitor. The user can remove, add, or change any of these
power components, including the inductor, to achieve a particular design objective. The track function, where TRK is pulled up to VCCO through a 100 kΩ resistor (R4), is not used on this evaluation board. If a tracking function is needed, the user can remove the resistor, R4, and place a resistor divider (R8/R9) to configure the desired tracking function. To study the precision enable function, remove the shunt for JP2 and apply an external voltage to TP2 EN. To program higher UVLO threshold, place the required resistor divider (R3/R5). See Figure 8, the evaluation board schematic, for more information.
Rev. 0 | Page 6 of 12
T4
1
1
VOUT+
TURRET
1 2 3 4
TURRET
T3
20
R14
TP8
T10 TURRET
T9 TURRET
150uF/20V
+ C1
1
NP
C8
20K
R18
R13
NP
1
R21 4.42K
3
T2 2
TP6
R15
JP2 2 Way Link
1
VIN+
1
1
C10
37.4K
C6
NP
R5
NP
R3
1
27pF
C9
0.1UF
TP5
0
R10
1
VCC
680pF
2
TP16
VCC
1
AGND
COMP
FB
SS
EN
TP3
R1 NP
CLKOUT
SYNC
TP12
5
4
3
2
1
100K
R4
TP15
EN
NP
R9
R8 NP
JP5 2 Way Link
TP18
fsw = 300KHz
3 1
JP1
2
2 Way Link
VIN+
R6 232K
1 2 3 4
1
1UF
C23
TP1
R29
1.0uF
C20
VCC
2
NP
R23
0
DL
R25
R16
DH
R7 NP
R20 22K
0
NP
0.1UF
VIN+
SW
C7
R19
22PF
C15
2
R12 0
R26
ADP1853ACPZ-R7
PAD
11
12
13
14
15
TP13
U1
DL
CS
SW
DH
BST
PGOOD
1
TP2
R11 1.87K
TP10
NP G S3 S2 S1
Q1
NP
D4 D3 D2 D1
G S3 S2 S1
D4 D3 D2 D1
Q3 BSC0902NS
TP11
R24 0.003/ 2W
TP9 1
VIN+
3 1
1 20 TRK SYNC 6
18
FREQ
19 RAMP VIN 8
17 9
CLKOUT 7
PGOOD VCCO
16 ILIM PGND 10
1
T1
1
1
1
Vin = 9V to 15V
1
Rev. 0 | Page 7 of 12 C4
G S3 S2 S1
G S3 S2 S1
VIN+
D4 D3 D2 D1
TP14
Q4 NP
C5 10uF/25V
D4 D3 D2 D1
Q2 BSC052N03LS
1
Figure 8. Evaluation Board Schematic
1.0uH
1500pF
C19
R17 2
L1
22uF/10V
C16
JP8
NP
C17
NP
+ C18
AGND
330uF
+ C12
VOUT+
VOUT+
1
1 2 3 4
1
1 2 3 4
T6
T8 TURRET
T7
TURRET
T5
VOUT = 3.3V 20A
10831-008
VCC
ADP1853-EVALZ User Guide UG-431
EVALUATION BOARD SCHEMATICS AND ARTWORK
ADP1853-EVALZ User Guide
10831-009
UG-431
10831-010
Figure 9. Top Layer with Silkscreen
Figure 10. Second Layer (AGND Plane)
Rev. 0 | Page 8 of 12
UG-431
10831-011
ADP1853-EVALZ User Guide
10831-012
Figure 11. Third Layer (VIN, VCCO, VOUT, and PGND)
Figure 12. Bottom Layer
Rev. 0 | Page 9 of 12
UG-431
ADP1853-EVALZ User Guide
ORDERING INFORMATION BILL OF MATERIALS Table 3. Qty 1 2 1 2 1 1 1 1 1 1 1 1 1 2 3 1 1 1 1 1 1 9 1 1 4 1 3 1 1 1 1 1 1 15 4 6 1 3 4 4
Reference Designator C1 C4 C5 C6, C7 C8 C9 C10 C12 C15 C16 C17 C18 C19 C20, C23 JP1, JP2, JP5 JP8 L1 Q1 Q2 Q3 Q4 R1, R3, R5, R7, R8, R9, R13, R16, R23 R4 R6 R10, R19, R25, R26 R11 R12, R17, R29 R14 R15 R18 R20 R21 R24 TP1, TP2, TP3, TP5, TP6, TP8, TP9, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP18 T1, T3, T5, T7 T2, T4, T6, T8, T9, T10 U1
Description OS-CON 150 µF 20 V Open Capacitor ceramic 10 µF 25 V 10% X7R 1210 Capacitor ceramic 0.1 µF 25 V 10% X7R 0603 Open Capacitor ceramic 680 pF X7R 0603 Capacitor ceramic 27 pF C0G/NP0 0603 POSCAP 330 µF 6.3 V 15 mΩ Capacitor ceramic 22 pF C0G/ NP0 0603 Capacitor ceramic 22 µF 10 V X5R 1210 Open Open Capacitor ceramic 1500 pF X7R 0603 Capacitor ceramic 1 µF 25 V X7R 0603 Jumper, Header 3, 0.100' Solder bridge Inductor 1.0 µH 1.3 mΩ, ISAT = 32 A, IRMS = 37 A Open N MOSFET, 30 V, 5.2 mΩ N MOSFET, 30 V, 2.6 mΩ Open Open
Manufacturer Sanyo
Part No. 20SEP150M
Murata Murata
GRM32DR71E106KA12 GRM188R71E104KA01D
Murata Murata Sanyo Murata Murata
GRM188R71H681KA01D GRM1885C1H270JA01D 6TPE330MFL GRM1885C1H220JA01D GRM32ER61A226KE20L
Murata Murata Samtec
GRM188R71H152KA01D GRM188R71E105KA12D TSW-150-07-G-S
Coilcraft
SER1412-102ME
Infineon Infineon
BSC052N03LS BSC0902NS
Resistor 100 kΩ 1/10W 5% 0603 Resistor 232 kΩ 1% Resistor 0 Ω Resistor 1.87 kΩ 1% Resistor 2.0 Ω 1% Resistor 20 Ω Resistor 37.4 kΩ 1% Resistor 20 kΩ 1% Resistor 22 kΩ 1% Resistor 4.42 kΩ 1% Resistor.003 Ω 2 W 1% 2512 SMD Test points, header 0.100"
Vishay Vishay Vishay Vishay Vishay Vishay Vishay Vishay Vishay Vishay ROHM Samtec
CRCW0603100KFKEA CRCW0603232KFKEA CRCW06030000Z0EA CRCW06031K87FKEA CRCW0602R00FKEA CRCW060320R0FKEA CRCW060337K4FKEA CRCW060320K0FKEA CRCW060322K0FKEA CRCW06034K42FKEA PMR100HZPFV3L00 TSW-150-07-G-S
Terminal screw vertical PC MNT TURRET170 Device under test, 20LD LFCSP Shunt Standoff HEX .500/4 NYL Screw NYL slot
Keystone Electronics Corp. Keystone Electronics Corp. Analog Devices Samtec Keystone Electronics Corp. Richco
8191K-ND 1502-1 ADP1853ACPZ-R7 SNT-100-BK-G 1902C NSS-4-6-01
Rev. 0 | Page 10 of 12
ADP1853-EVALZ User Guide
UG-431
NOTES
Rev. 0 | Page 11 of 12
UG-431
ADP1853-EVALZ User Guide
NOTES
ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. ©2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG10831-0-6/12(0)
Rev. 0 | Page 12 of 12
