Rohm BD7F100HFN-LB User Manual
© 2017 ROHM Co., Ltd.
No. 60AP001E Rev.001
2017.4
© 2017 ROHM Co., Ltd.
No. 60UG032E Rev.002
NOV.2018
User’s Guide
Parameter
Min
Typ
Max
Units
Conditions
Input Voltage
24.0 V
Output Voltage
5.0 V
R4=3.9kΩ, R5=80.6kΩ
Output Current Range
13.8 1000
mA
Maximum Output Power：5W
Operating Frequency
400 kHz
Maximum Efficiency
77.5 %
IO = 1000mA
Switching Regulator Series
Isolated Flyback DC/DC Converter
BD7F100HFN-LB Evaluation Board
BD7F100HFN-EVK-002 (24V→5V, 1A)
BD7F100HFN-EVK-002 Evaluation board delivers an output 5 volts from an input 24 volts using BD7F100HFN-LB, Isolated Flyback DC/DC
converter integrated circuit, with output current rating of maximum 1A.
Performance specification
These are representative values, and it is not a guaranteed against the characteristics.
VIN = 24V, V
= 5V, Unless otherwise specified.
OUT
Evaluation Board
PCB size: 70mm×50mm×1.6mm
Figure 1. BD7F100HFN-EVK-002 Evaluation Board Figure 2. BD7F100HFN-EVK-002 Evaluation Board
Top View Bottom View
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User’s Guide
BD7F100HFN-EVK-002
© 2017 ROHM Co., Ltd.
No. 60UG032E Rev.002
NOV.2018
DC Voltmeter 1
DC Voltmeter 2
-
+
-
+
-
DC Power
+
-
Load
+
V
V
Operation Procedures
1. Necessary equipments
(1) DC power-supply of 24V / 0.5A
(2) Maximum 1A load
(3) DC voltmeter
2. Connecting the equipments
(1) DC power-supply presets to 24V and then the power output turns off.
(2) The maximum load should be set at 1A and over it will be disabled.
(3) Connect positive-terminal of power-supply to VIN terminal and negative-terminal to GND terminal with a pair of wires.
(4) Connect load’s positive-terminal to VOUT+ terminal and negative-terminal to VOUT-terminal with a pair of wires.
(5) Connect positive-terminal of DC voltmeter 1 to VIN and negative-terminal to GND for input-voltage measurement.
(6) Connect positive-terminal of DC voltmeter 2 to VOUT+ and negative-terminal to VOUT- for output-voltage measurement.
(7) DC power-supply output is turned ON.
(8) Check DC voltmeter 2 displays 5V.
(9) The load is enabled.
Figure 3. Connection Diagram
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User’s Guide
BD7F100HFN-EVK-002
© 2017 ROHM Co., Ltd.
No. 60UG032E Rev.002
NOV.2018
C6
C5
R6
D3
C7 R7 D4
GND
R1
R2
VOUT-
VOUT+
SDX/EN
C8
CN1
+
-
-
CN2
+
T1
4,5 1,2
6,7 9,10
U1
AGND
1
SDX/EN
2
COMP
3
REF
4
FIN
9
VIN
8
SW
7
PGND
6
FB
5
D1
D2
C3
C2C1
R4R3C4
R5
VIN
No. Value Description Size Part Number / Series Manufactuer
C1 1μF Capacitor, Chip, 50V, X7R 2012 GRM21BR71H105KA12L MURATA
C2 4.7μF Capacitor, Chip, 50V, X7R 3216 GRM31CR71H475KA12L MURATA
C3 - Notinstalled - - C4 - Notinstalled - - C5 1000pF Capacitor, Chip, 50V, CH 1608 GRM1882C1H102JA01 MURATA
C6 - Notinstalled - - C7 47μF Capacitor, Chip, 10V, X7R 3225 GRM32ER71A476KE15 MURATA
C8 - Notinstalled - - D1 RB160MM-40 Diode, Schottky 3516 RB160MM-40 ROHM
D2 TFZ20B Diode, Zener, Vz=18.63～19.59V 2514 TFZ20B ROHM
D3 RB160MM-40 Diode, Schottky 3516 RB160MM-40 ROHM
D4 - Notinstalled - - R1 1MΩ Resistor, Chip, 1/16W, 1% 1005 MCR01MZPF1004 ROHM
R2 120kΩ Resistor, Chip, 1/16W, 1% 1005 MCR01MZPF1203 ROHM
R3 - Short - - R4 3.9kΩ Resistor, Chip, 1/16W, 1% 1005 MCR01MZPF3901 ROHM
R5 80.6kΩ Resistor, Chip, 1/16W, 1% 1005 MCR01MZPF8062 ROHM
R6 1kΩ Resistor, Chip, 2/5W, 1% 2012 ESR10EZPF1001 ROHM
R7 330Ω Resistor, Chip, 1/10W, 1% 1608 MCR03EZPFX3300 ROHM
T1 63μH Transformer, Np:Ns=3:1, ±20% 13.5 x 20.0 x 12.5mm CEP1311D-2405051R sumida
U1 BD7F100HFN I.C. BD7F100HFN HSON8 BD7F100HFN ROHM
Circuit Diagram
VIN = 24V, V
OUT
= 5V
Figure 4. BD7F100HFN-EVK-002 Circuit Diagram
Bill of Materials
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