BD7F100HFN-EVK-001

Switching Regulator Series Isolated DC/DC Converter BD7F100HFN Evaluation Board BD7F100HFN-EVK-001 General Description BD7F100HFN-EVK-001 Evaluation Board outputs 5.0V voltage from 24V input using IC BD7F100HFN, an isolated DC/DC converter. It supplies 800mA output current at maximum. Performance specifications (The values listed here are representative values, which does not assure the characteristics.) Unless otherwise is specified: VIN = 24V, VOUT = 5.0V Parameter Min Typ Max Units Input voltage range 24 V Output voltage 5.0 V Output current range 13.8 800 mA Conditions R4=3.9kΩ, R5=80.6kΩ Maximum Output Power:4W Input ripple voltage 80 mVpp IO = 500mA Output ripple voltage 80 mVpp IO = 500mA Output rise time 6 ms Operating frequency 400 kHz Maximum efficiency 76.7 % www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. 1/11 IO = 800mA 2016.6.3 Rev.001 BD7F100HFN-EVK-001 Operation Procedures 1. Required equipment (1) DC power supply for 24V, 0.5A (2) 800mA load at maximum (3) DC voltmeter 2. Connect the equipment. (1) Preset DC voltage to 24V and power supply output to OFF. (2) Set load below 800mA to disable load. (3) Connect the power supply positive terminal to VIN + terminal, and the negative terminal to GND - terminal, using a pair of wires. (4) Connect the load positive terminal to VOUT + terminal, and the negative terminal to GND - terminal, using a pair of wires. (5) To measure input voltage, connect the DC voltmeter 1 positive terminal to TP1, and the negative terminal to TP2. (6) To measure output voltage, connect the DC voltmeter 2 positive terminal to TP4, and the negative terminal to TP3. (7) Turn ON DC voltage output. (8) Check that the DC voltmeter 2 reads 5.0V. (9) Enable load. + DC voltmeter 1 V + - V DC voltmeter 2 + - DC power supply Load + - Figure 1. Connection Diagram www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 2/11 2016.6.3 Rev.001 BD7F100HFN-EVK-001 Setting Enable Voltage As an IC operating condition, it is required to operate the converter with duty of 50% or less when the input power supply is either ON or OFF. If duty exceeds 50%, a phenomenon such as overshoot or overboosting happens. To avoid this, the condition of following formula must be satisfied: 𝑉𝐷𝐼𝑆𝐴𝐵𝐿𝐸 > 𝑁𝑃 × (𝑉𝑂𝑈𝑇 + 𝑉𝐹 ) 𝑁𝑆 VDISABLE: Stopping voltage Np: Number of turns of transformer on the primary side Ns: Number of turns of transformer on the secondary side Vout: Output voltage Vf: Forward voltage of output diode on the secondary side To satisfy the input OFF voltage condition, put resistors R1 and R2 between the input and ground for the division and connect SDX/EN terminal. This will enable start/stop with arbitrary input voltage. The threshold at the time of SDX/EN terminal rise is set to 2.0V (Typ). At fall time, 0.2V (Typ) hysteresis voltage is applied. VENABLE VDISABLE VIN 2V 1.8V SDX/EN VOUT Starting voltage can be set using the following formula: 𝑉𝐸𝑁𝐴𝐵𝐿𝐸 = 2.0𝑉 × (𝑅1 + 𝑅2) 𝑅2 Stopping voltage can be set using the following formula: 𝑉𝐷𝐼𝑆𝐴𝐵𝐿𝐸 = 1.8𝑉 × (𝑅1 + 𝑅2) 𝑅2 * Example 24V input: Connect R1=1MΩ and R2=120kΩ. Starting voltage: 18.7V (Typ) Stopping voltage: 16.9V (Typ) www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 3/11 2016.6.3 Rev.001 BD7F100HFN-EVK-001 Circuit Diagram VIN = 24V, VOUT = 5.0V SDX/EN VIN(TP1) D3 3,4 + D1 C3 CN1 C2 C1 T1 7,8 VOUT+(TP4) R1 C5 + - CN2 D4 R2 C7 2 3 AGND VIN SDX/EN SW COMP REF PGND FB D2 8 R3 - R6 VOUT-(TP3) 7 6 R5 5 C8 9 4 U1 BD7F100HFN FIN 1 R7 5,6 1,2 GND(TP2) R4 C4 Figure 2. BD7F100HFN-EVK-001 Circuit Diagram Parts List No. Value Description Size Part Number / Series Manufacture C1 1μF Capacitor, Chip, 50V, X7R 2012 GRM21BR71H105KA12 MURATA C2 C3 C4 C5 C6 C7 C8 D1 4.7μF 1000pF 47μF EDZV20B Capacitor, Chip, 50V, X7R Capacitor, Chip, 50V, CH Capacitor, Chip, 10V, X7R Diode, Zener 3216 1608 3225 1608 GRM31CR71H475KA12 GRM1882C1H102JA01 GRM32ER71A476KE15 EDZV20B MURATA MURATA MURATA ROHM D2 RB160SS-40 Diode, Schottky 2512 RB160SS-40 ROHM D3 RB160M-40 Diode, Schottky 3516 RB160M-40 ROHM D4 VDZ6.2B Diode, Zener 1406 VDZ6.2B ROHM R1 1MΩ Resistor, Chip, 1/10W, 1% 1608 MCR03EZPF1004 ROHM R2 R3 R4 R5 R6 R7 T1 120kΩ 0Ω 3.9kΩ 80.6kΩ 2kΩ 1kΩ 63μH Resistor, Chip, 1/10W, 1% Resistor, Chip, 1/10W, 1% Resistor, Chip, 1/10W, 1% Resistor, Chip, 1/10W, 1% Resistor, Chip, 1/8W, 1% Resistor, Chip, 1/10W, 1% Transformer, Np:Ns=3:1, ±20% 1608 1608 1608 1608 2012 1608 10.0 x 10.0 x 11.5mm MCR03EZPF1203 MCR03EZPJ000 MCR03EZPF3901 MCR03EZPF8062 MCR10EZHF2001 MCR03EZPF1001 CEP911B-2405051R ROHM ROHM ROHM ROHM ROHM ROHM sumida U1 BD7F100HFN I.C. BD7F100HFN HSON8 BD7F100HFN ROHM www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 4/11 2016.6.3 Rev.001 BD7F100HFN-EVK-001 PCB Layout Figure 3. Top Silk Screen (Top view) Figure 4. Top Silk Screen and Layout www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 5/11 (Top view) 2016.6.3 Rev.001 BD7F100HFN-EVK-001 PCB Layout Figure 5. Top Layout (Top view) Figure 6. L2 Layout (Top view) www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 6/11 2016.6.3 Rev.001 BD7F100HFN-EVK-001 PCB Layout Figure 7. L3 Layout (Top view) Figure 8. Bottom Layout (Top view) www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 7/11 2016.6.3 Rev.001 BD7F100HFN-EVK-001 5.5 Limitation with SW terminal voltage 50V (Max) Limitation with current limit 1A (Min) 5.4 5.3 5.2 LOAD REG 5.1 5 4.9 4.8 4.7 4.6 4.5 0 0.2 0.4 0.6 0.8 OUT_CURRENT (A) Figure 10. Load Regulation Figure 9. Maximum Output Power VIN = 24V VOUT = 5.0V VOUT (AC):100mV/div IOUT: 500mA/div IOUT: 300mA→800mA→300mA Time scale 200us/div Figure 11. Load Transient Characteristics www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 8/11 2016.6.3 Rev.001 BD7F100HFN-EVK-001 IOUT = 100mA VIN (AC) 50mV/div Time scale 2us/div IOUT = 500mA VIN (AC) 50mV/div Time scale 2us/div IOUT = 800mA VIN (AC) 50mV/div Figure 12. Input Voltage Ripple Waveform VIN = 24V, VO = 5.0V Time scale 2us/div IOUT = 100mA VOUT (AC) 50mV/div Time scale 2us/div IOUT = 500mA VOUT (AC) 50mV/div Time scale 2us/div IOUT = 800mA VOUT (AC) 50mV/div Time scale 2us/div Figure 13. Output Voltage Ripple Waveform VIN = 24V, VOUT = 5.0V www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 9/11 2016.6.3 Rev.001 BD7F100HFN-EVK-001 EN 2V/div VIN 10V/div VOUT 2V/div Time scale 50ms/div Figure 14. Startup VIN = 24V, VOUT = 5.0V, IOUT =100mA Time scale 50ms/div Figure 15. Power Down VIN = 24V, VOUT = 5.0V, IOUT = 100mA EN 2V/div VIN 10V/div VOUT 2V/div Time scale 50ms/div Figure 16. Startup VIN = 24V, VOUT = 5.0V, IOUT =500mA Time scale 50ms/div Figure 17. Power Down VIN = 24V, VOUT = 5.0V, IOUT = 500mA EN 2V/div VIN 10V/div VOUT 2V/div Time scale 50ms/div Figure 18. Startup VIN = 24V, VOUT = 5.0V, IOUT =800mA www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 10/11 Time scale 50ms/div Figure 19. Power Down VIN = 24V, VOUT = 5.0V, IOUT = 800mA 2016.6.3 Rev.001 BD7F100HFN-EVK-001 T1:41.8˚C D1:55.2˚C D3:49.1˚C U1:42.6˚C R6:62.5˚C Figure 20. Parts Temperature VIN = 24V, VO = 5.0V, IO =800mA 90 80 Efficiency (%) 70 60 50 40 30 20 10 0 0 0.2 0.4 0.6 0.8 OUT_CURRENT (A) Figure 21. Efficiency VIN = 24V, VO = 5.0V www.rohm.co.jp © 2016 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 11/11 2016.6.3 Rev.001 Notice Notes 1) The information contained herein is subject to change without notice. 2) Before you use our Products, please contact our sales representative and verify the latest specifications : 3) Although ROHM is continuously working to improve product reliability and quality, semiconductors can break down and malfunction due to various factors. Therefore, in order to prevent personal injury or fire arising from failure, please take safety measures such as complying with the derating characteristics, implementing redundant and fire prevention designs, and utilizing backups and fail-safe procedures. ROHM shall have no responsibility for any damages arising out of the use of our Poducts beyond the rating specified by ROHM. 4) Examples of application circuits, circuit constants and any other information contained herein are provided only to illustrate the standard usage and operations of the Products. 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