DEMO MANUAL DC2543B LTC7820EUFD High Efficiency, Charge ... · 19 3 q3, q6, q7 xstr, n-channel...

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1 DEMO MANUAL DC2543B Rev. 0 DESCRIPTION LTC7820EUFD High Efficiency, Charge Pump DC/DC Converter Demonstration circuit 2543B is a high efficiency, high density, open loop charge pump (inductorless) DC/DC converter. This demo board is a voltage divider which achieves a 2:1 step-down ratio from an input voltage from 36V to 60V. The output voltage is a fixed ratio of half of the input voltage (V IN /2) and can supply a 10A load current. This demo board has the option to deliver a 20A maximum load with the addition of 15 chip capacitors. See Figure 8 and Figure 10 for the details. The DC2543B provides a very high efficiency solution of 98.7% when converting 48V IN to 24V OUT at 10A as shown in Figure 3. When configured for a 20A output, an effi- ciency of up to 98.4% is achievable for a 48V IN to 24V OUT at 20A as shown in Figure 8. The demo board features the LTC ® 7820, a fixed ratio high voltage high power switched capacitor/charge pump controller in a 4mm × 5mm QFN package. Please see LTC7820 data sheet for more detailed information. PERFORMANCE SUMMARY The DC2543B needs to be powered on with no load cur- rent or a very small load current (less than 50mA) with the default setup. Large load current can be applied after V O is established. The board offers a disconnect FET option which is controlled by the LTC7820 FAULT pin to disconnect the load during startup as shown in the schematic. Please refer to “Voltage Divider Prebalance Before Switching” section in the LTC7820 data sheet for more details regarding the startup of the voltage divider. The board also features some protection functions such as overcurrent and thermal shutdown to make it a reliable solution. Design files for this circuit board are available. Specifications are at T A = 25°C PARAMETER CONDITION VALUE Input Voltage Range 36V to 60V Output Voltage, V OUT V IN = 36 to 60V, I OUT = 0A to 10A V IN /2 Maximum Output Current, I OUT V IN = 36 to 60V, V OUT = V IN /2 10A Typical Efficiency V IN = 48V, V OUT = 24V, I OUT = 10A 98.7% Peak Efficiency V IN = 48V, V OUT = 24V 99% Switching Frequency 200kHz All registered trademarks and trademarks are the property of their respective owners. NOTE: DC2543B demo board includes a Schottky diode added across the output. This manual describes the demo board entitled “Demo Circuit 2543B.” The DC2543B replaces the DC2543A.

Transcript of DEMO MANUAL DC2543B LTC7820EUFD High Efficiency, Charge ... · 19 3 q3, q6, q7 xstr, n-channel...

Page 1: DEMO MANUAL DC2543B LTC7820EUFD High Efficiency, Charge ... · 19 3 q3, q6, q7 xstr, n-channel mosfet infineon bsc032n04ls 20 4 q9, q10, q11, q23 xstr, n-ch 40v 14a to-252 vishay

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DEMO MANUAL DC2543B

Rev. 0

DESCRIPTION

LTC7820EUFDHigh Efficiency, Charge Pump

DC/DC Converter

Demonstration circuit 2543B is a high efficiency, high density, open loop charge pump (inductorless) DC/DC converter. This demo board is a voltage divider which achieves a 2:1 step-down ratio from an input voltage from 36V to 60V. The output voltage is a fixed ratio of half of the input voltage (VIN/2) and can supply a 10A load current. This demo board has the option to deliver a 20A maximum load with the addition of 15 chip capacitors. See Figure 8 and Figure 10 for the details.

The DC2543B provides a very high efficiency solution of 98.7% when converting 48VIN to 24VOUT at 10A as shown in Figure 3. When configured for a 20A output, an effi-ciency of up to 98.4% is achievable for a 48VIN to 24VOUT at 20A as shown in Figure 8.

The demo board features the LTC®7820, a fixed ratio high voltage high power switched capacitor/charge pump controller in a 4mm × 5mm QFN package. Please see LTC7820 data sheet for more detailed information.

PERFORMANCE SUMMARY

The DC2543B needs to be powered on with no load cur-rent or a very small load current (less than 50mA) with the default setup. Large load current can be applied after VO is established. The board offers a disconnect FET option which is controlled by the LTC7820 FAULT pin to disconnect the load during startup as shown in the schematic. Please refer to “Voltage Divider Prebalance Before Switching” section in the LTC7820 data sheet for more details regarding the startup of the voltage divider. The board also features some protection functions such as overcurrent and thermal shutdown to make it a reliable solution.

Design files for this circuit board are available.

Specifications are at TA = 25°C

PARAMETER CONDITION VALUE

Input Voltage Range 36V to 60V

Output Voltage, VOUT VIN = 36 to 60V, IOUT = 0A to 10A VIN/2

Maximum Output Current, IOUT VIN = 36 to 60V, VOUT = VIN/2 10A

Typical Efficiency VIN = 48V, VOUT = 24V, IOUT = 10A 98.7%

Peak Efficiency VIN = 48V, VOUT = 24V 99%

Switching Frequency 200kHz

All registered trademarks and trademarks are the property of their respective owners.

NOTE: DC2543B demo board includes a Schottky diode added across the output. This manual describes the demo board entitled “Demo Circuit 2543B.” The DC2543B replaces the DC2543A.

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DEMO MANUAL DC2543B

Rev. 0

QUICK START PROCEDUREDemonstration circuit 2543B is easy to set up to evaluate the performance of the LTC7820. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below.

1. With power off, connect the input power supply to VIN (36V to 60V) and GND (input return).

2. Connect the output loads between VOUT and GND (Initial load: no load). Refer to Figure 1.

3. Connect the DVMs to the input and output.

4. Check the default jumper/switch position: SW1 (RUN): OFF; JP2 (BIAS): ON.

5. Turn on the input power supply and adjust voltage to 48V.

NOTE: Make sure that the input voltage does not exceed 60V.

6. Turn on the switches: SW1: ON.

7. Check for the proper output voltages from VO_SNS+ to

VO_SNS–.

8. Once the proper output voltage is established, adjust the loads within the operating range and measure the efficiency, output ripple voltage and other parameters.

9. After completing all tests, adjust the load to 0A, power off the input power supply.

Notes:

1. When measuring the output or input voltage ripple, do not use the long ground lead on the oscilloscope probe. See Figure 3 for the proper scope probe tech-nique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead.

2. When doing the load step test with the on-board dynamic load circuit, please make sure the load step-up pulse duty cycle does not exceed 2% and the pulse duration is less than 500µs so that the temperature of the MOSFETs Q9, Q23 in the dynamic load circuit stay in the safe region. Instead of using the on-board dynamic load circuit, an electric load can also be used for the load step test, which does not have the 2% maximum duty cycle limit for the load step.

3. It is recommended to set the electronic load in CR (con-stant resistance) mode for evaluation of the DC2543B board. Some electronic loads draw negative current in CC (constant current) mode when evaluating the output overcurrent protection feature of DC2543B, which can violate the absolute maximum voltage rating –0.3V for VLOW pin.

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DEMO MANUAL DC2543B

Rev. 0

QUICK START PROCEDURE

–+–+

+

VIN36V to 60V

+

+

–LOAD

DC2543B F01

+ –

VOUT GND

COUT

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Output Voltage Ripple

Note: It is recommended to set the electronic load in CR (constant resistance) mode for evaluation of the DC2543B board. Some electronic loads draw negative current in CC (constant current) mode when evaluating the output overcurrent protection feature of DC2543B, which can violate the absolute maximum voltage rating –0.3V for VLOW pin.

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DEMO MANUAL DC2543B

Rev. 0

QUICK START PROCEDURE

Figure 3. Efficiency vs Load Current at VIN = 48V, VOUT = 24V, fSW = 200kHz

OUTPUT LOAD CURRENT (A)0

90

EFFI

CIEN

CY (%

)

92

94

100

98

96

2 4 6 8 10

DC2543B F03

OUTPUT LOAD CURRENT (A)0

23.0

23.2

23.4

23.6

V OUT

(V)

23.8

24.0

24.6

24.4

24.2

2 4 6 8 10

DC2543B F04

Figure 4. Load Regulation for 10A Design at VIN = 48V, VOUT = 24V, fSW = 200kHz

Figure 5. Output Voltage Ripple at VIN = 48V, VOUT = 24V, IOUT = 10A, fSW = 200kHz

Figure 6. Load Step at VIN = 48V, VOUT = 24V2µs/DIV

VOUTRIPPLE

20MHz BW500mV/DIV

DC2543B F05

100µs/DIV

0A-5A-0ALOAD STEP

VOUT20MHz BW500mV/DIV

DC2543B F06

Figure 7. Thermal performance VIN = 48V, VOUT = 24V, IOUT = 10A, TA = 23°C, No Airflow

Q1 Q3

Q6 Q7

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DEMO MANUAL DC2543B

Rev. 0

QUICK START PROCEDURE

OUTPUT LOAD CURRENT (A)0

92

EFFI

CIEN

CY (%

)

93

94

100

98

96

95

99

97

2 6 10 144 8 12 16 18 20

DC2543B F08

OUTPUT LOAD CURRENT (A)0

23.0

V OUT

(V)

23.2

23.4

24.6

24.2

23.8

23.6

24.4

24.0

2 6 10 144 8 12 16 18 20

DC2543B F09

Figure 8. Efficiency vs Load Current at VIN = 48V, VOUT = 24V, fSW = 200kHz*

Figure 9. Load Regulation for 20A Design at VIN = 48V, VOUT = 24V, fSW = 200kHz*

Figure 10. Thermal performance at VIN = 48V, VOUT = 24V, IOUT = 20A TA = 23°C, No Airflow*

* Note: Additional C11, C12, C60, C61, C22-C25, C69-C72, C30, C31, and C36 (10µF/50V, MURATA GRM32ER71H106KA12L) are populated; RS1 is changed to 2.5mΩ (WSL20102L500FEB18) for this test.

Q1 Q3

Q6

Q7

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DEMO MANUAL DC2543B

Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 33µF 20% 80V ELEC PANASONIC EEHZA1K330P

2 8 C2, C3, C47, C49, C56, C57, C58, C59 CAP, 1210 2.2µF 10% 100V X7R MURATA GRM32DR72A225KA12

3 4 C4, C5, C15, C126 CAP, 0603 0.1µF 10% 100V X7R MURATA GRM188R72A104KA35D

4 2 C6, C7 CAP, 0805 4.7µF 10% 16V X7R MURATA GRM21BR71C475KA73K

5 1 C8 CAP, 0603 0.22µF 10% 25V X7R MURATA GRM188R71E224KA88D

6 2 C9, C26 CAP, 0603 0.47µF 10% 25V X7R MURATA GRM188R71E474KA12D

7 2 C17, C28 CAP, 0805 2.2µF 10% 50V X7R TDK C2012X7R1H225K125AC

8 11 C18, C19, C20, C21, C29, C66, C67 CAP, 1210 10µF 10% 50V X7R MURATA GRM32ER71H106KA12L

9 C68, C73, C74, C65

10 2 C27, C50 CAP, 0603 1µF 10% 50V X5R MURATA GRM188R61H105K

11 2 C52, C53 CAP, 1210 22µF 10% 25V X5R AVX 12103D226KAT2A

12 1 C54 CAP, 0603 47nF 10% 25V X7R AVX 06033C473KAT2A

13 1 C55 CAP, 0603 470pF 10% 50V X7R MURATA GRM188R71H471KA01D

14 3 D1, D2, D3 DIODE, SCHOTTKY CENTRAL SEMI. CMDSH-4E TR

15 1 D6* DIODE, SCHOTTKY ON SEMI, NRVTSAF5100E

16 2 D9, D10 DIODE, ZENER CENTRAL SEMI. CMHZ5236B TR

17 1 L2 IND, 68µH COILCRAFT., LPS6225-683MRB

18 1 Q1 XSTR, N-CHANNEL MOSFET INFINEON BSC027N06LS5

19 3 Q3, Q6, Q7 XSTR, N-CHANNEL MOSFET INFINEON BSC032N04LS

20 4 Q9, Q10, Q11, Q23 XSTR, N-CH 40V 14A TO-252 VISHAY SUD50N04-8M8P-4GE3

21 1 Q22 TRANSISTOR., SOT-23 FAIRCHILD., BSS123L

22 1 RS1 RES., CHIP, 0.005, 1%, 2010 VISHAY, WSL20105L000FEA

23 1 RS2 RES, 2010 0Ω JUMPER VISHAY WSL201000000ZEA9

24 2 R1, R7 RES, 0603 1kΩ 1% VISHAY CRCW06031K00FKEA

25 1 R2 RES, 0603 2.2Ω 5% YAGEO RC0603JR-072R2L

26 4 R5, R10, R24, R32 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA

27 4 R9, R13, R17, R28 RES, 0603 10kΩ 1% NIC NRC06F1002TRF

28 1 R16 RES, 0603 60.4kΩ 1% VISHAY CRCW060360K4FKEA

29 1 R18 RES, 0603 100kΩ 1% VISHAY CRCW0603100KFKEA

30 1 R26 RES, 0603 154kΩ 1% YAGEO RC0603FR-07154KL

31 1 R27 RES, 0603 20kΩ 5% VISHAY CRCW060320K0JNEA

32 1 R29 RES, 0603 80.6kΩ 1% YAGEO RC0603FR-0780K6L

33 1 R30 RES. 2010 1Ω 1% 1W IRC LRC-LR2010-01-1R00-F

34 1 R31 RES, 0603 100Ω 5% VISHAY CRCW0603100R0JNEA

35 1 U1 IC, LTC7820EUFD, QFN 4mm × 5mm ANALOG DEVICES, LTC7820EUFD#PBF

36 1 U2 IC, LTC3630AEMSE ANALOG DEVICES, LTC3630EMSE#PBF

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DEMO MANUAL DC2543B

Rev. 0

PARTS LISTAdditional Demo Board Circuit Components

1 0 C10-C14, C16, C33, C34, C35, C36, C60-C64, C51, C77

CAPACITOR, OPT

2 0 C30-C32, C22-C25, C69-C72, C127

3 0 Q2, Q4, Q5,Q8 OPT MOSFET, OPT

4 0 R6, R19, R2, R36, R8, R11, R12, R20, R34, R35, R60

RESISTOR, OPT

Hardware: For Demo Board Only

1 9 E1, E2, E6-E8, E10, E12, E14, E15 TURRET MILL-MAX 2501-2-00-80-00-00-07-0

2 1 JP2 HEADER, 3 PIN 2mm WURTH ELEKTRONIK 62000311121

3 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE, 575-4

4 2 J5, J6 CONN, BNC, 5 PINS CONNEX, 112404

5 1 SW1 SWITCH, SUBMINIATURE SLIDE C&K COMPONENTS, JS202011CQN

6 1 XJP2 SHUNT 2mm WURTH ELEKTRONIK 60800213421

7 4 STANDOFF STANDOFF, SNAP ON KEYSTONE 8833

*Note: D6 is for negative voltage clamping on VOUT of DC2543B board in output overcurrent test with electronic load. Some electronic loads draw negative current in CC mode when evaluating the output overcurrent protection feature of DC2543B, which can violate the absolute maximum voltage rating –0.3V for VLOW pin without D6 populated.

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DEMO MANUAL DC2543B

Rev. 0

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0805

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0

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S5

4

5678

3

12

R1 1k1%

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100

C31

R36

OPT

0805

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R20

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1%

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2010

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4

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3

12

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F

1210

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OOD

J1VI

N

C77

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C63

C30

OPT

C21

10uF

1210

Page 9: DEMO MANUAL DC2543B LTC7820EUFD High Efficiency, Charge ... · 19 3 q3, q6, q7 xstr, n-channel mosfet infineon bsc032n04ls 20 4 q9, q10, q11, q23 xstr, n-ch 40v 14a to-252 vishay

9

DEMO MANUAL DC2543B

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

SCHEMATIC DIAGRAM5 5

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Page 10: DEMO MANUAL DC2543B LTC7820EUFD High Efficiency, Charge ... · 19 3 q3, q6, q7 xstr, n-channel mosfet infineon bsc032n04ls 20 4 q9, q10, q11, q23 xstr, n-ch 40v 14a to-252 vishay

10

DEMO MANUAL DC2543B

Rev. 0

ANALOG DEVICES, INC. 2018

DC2543B 1018(0)www.analog.com

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.