User’s Guide
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.
V
IN
= 24V, V
OUT
= 5V, Unless otherwise specified.
Parameter
Input Voltage
Output Voltage
Output Current Range
Operating Frequency
Maximum Efficiency
13.8
400
77.5
Min
Typ
24.0
5.0
1000
Max
Units
V
V
mA
kHz
%
I
O
= 1000mA
R4=3.9kΩ, R5=80.6kΩ
Maximum Output Power：5W
Conditions
Evaluation Board
PCB size: 70mm×50mm×1.6mm
Figure 1. BD7F100HFN-EVK-002 Evaluation Board
Top View
Figure 2. BD7F100HFN-EVK-002 Evaluation Board
Bottom View
© 2017 ROHM Co., Ltd.
1/5
No. 60UG032E Rev.001
OCT.2017
BD7F100HFN-EVK-002
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.
User’s Guide
(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.
+
DC Voltmeter 1
V
+
V
DC Voltmeter 2
-
+
DC Power
-
-
Load
-
+
Figure 3. Connection Diagram
© 2017 ROHM Co., Ltd.
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No. 60UG032E Rev.001
OCT.2017
BD7F100HFN-EVK-002
Circuit Diagram
V
IN
= 24V, V
OUT
= 5V
SDX/EN
D3
VIN
R1
+
CN1
-
R2
C7
GND
4,5
U1
1
2
3
4
AGND
SDX/EN
COMP
FIN
REF
VIN
SW
PGND
FB
8
7
6
5
R5
C8
R6
D1
6,7
R7
C3
C1
C2
D2
C5
User’s Guide
VOUT+
T1
9,10
1,2
+
CN2
D4
-
VOUT-
C4
R3
R4
C6
9
Figure 4. BD7F100HFN-EVK-002 Circuit Diagram
Bill of Materials
No.
C1
C2
C3
C4
C5
C6
C7
C8
D1
D2
D3
D4
R1
R2
R3
R4
R5
R6
R7
T1
U1
1μF
4.7μF
-
-
1000pF
-
47μF
-
RB160MM-40
TFZ20B
RB160MM-40
-
1MΩ
120kΩ
-
3.9kΩ
80.6kΩ
1kΩ
330Ω
63μH
BD7F100HFN
Value
Description
Capacitor, Chip, 50V, X7R
Capacitor, Chip, 50V, X7R
Notinstalled
Notinstalled
Capacitor, Chip, 50V, CH
Notinstalled
Capacitor, Chip, 10V, X7R
Notinstalled
Diode, Schottky
2012
3216
-
-
1608
-
3225
-
3516
Size
Part Number / Series
Manufactuer
GRM21BR71H105KA12L MURATA
GRM31CR71H475KA12L MURATA
-
-
GRM1882C1H102JA01
-
GRM32ER71A476KE15
-
RB160MM-40
TFZ20B
RB160MM-40
-
MCR01MZPF1004
MCR01MZPF1203
-
MCR01MZPF3901
MCR01MZPF8062
MCR10EZPF1001
MCR03EZPFX3300
CEP1311D-2405051R
BD7F100HFN
-
-
MURATA
-
MURATA
-
ROHM
ROHM
ROHM
-
ROHM
ROHM
-
ROHM
ROHM
ROHM
ROHM
sumida
ROHM
Diode, Zener, Vz=18.63〜19.59V 2514
Diode, Schottky
Notinstalled
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Short
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/8W, 1%
Resistor, Chip, 1/10W, 1%
Transformer, Np:Ns=3:1, ±20%
I.C. BD7F100HFN
3516
-
1005
1005
-
1005
1005
2012
1608
13.5 x 20.0 x 12.5mm
HSON8
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3/5
No. 60UG032E Rev.001
OCT.2017
BD7F100HFN-EVK-002
Layout
User’s Guide
Figure 5. Top Silk Screen and Layout
(Top View)
Figure 6 . Bottom Silk Screen and Layout
(Top View)
Figure 7. Top Side Layout
(Top View)
Figure 8. Middle Layer1 Layout
(Top View)
Figure 9. Middle Layer2 Layout
(Top View)
Figure 10. Bottom Side Layer Layout
(Top View)
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4/5
No. 60UG032E Rev.001
OCT.2017
BD7F100HFN-EVK-002
Reference Application Data
V
IN
= 24V, V
OUT
= 5V
90
80
70
60
50
40
30
20
10
0
User’s Guide
Efficiency[%]
0.0
0.2
0.4
0.6
0.8
1.0
I
OUT
[A]
Figure 11. Efficiency vs Load Current
5.5
5.4
5.3
5.2
V
OUT
[V]
5.1
5.0
4.9
4.8
4.7
4.6
4.5
0.0
0.2
0.4
0.6
0.8
1.0
I
OUT
[A]
Figure 12. Load Regulation
© 2017 ROHM Co., Ltd.
5/5
No. 60UG032E Rev.001
OCT.2017
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