Data Sheet
100-200VAC Input/12W Output
Isolated AC/DC Converter
BP5728
Absolute Maximum Ratings
Parameter
6pin Input Voltage
2pin Input Voltage
3pin Input Voltage
3pin Input Current
Allowable Loss
Max Surface Temperature
Operating Temperature Range
Storage Temperature Range
Dimensions (Unit : mm)
Limits
800
−0.2
to
+6
24
8
0.64
105
−25
to +80
−25
to +105
Symbol
V
D
V
FB
V
DD
I
DD
P
D
Tcmax
Topr
Tstg
Unit
V
V
V
mA
W
°C
°C
°C
18.8MAX.
9.9MAX.
19.5MAX.
MARKING SIDE
4.0±1.0
1
2
3
0.5±0.1
1.3±0.2
6
0.25±0.05
5.55MAX.
4.35MAX.
3.25MAX.
2.54±0.2
Electrical Characteristics
Parameter
Input voltage
Output frequency
Turn on voltage
Turn off voltage
Maximum Duty
Zero-Duty I
FB
Parameter
Over drain current
protection
Symbol
V
DD
fo
V
DD
on
V
DD
off
Duty MAX
Ioz
Symbol
Idocp
2.54X5=12.7TYP.
(V
DD
=15V, Vd=15V,I
FB
=0.1mA,SW1=R1,Ta=25°C, unless otherwise specified)
Min.
8.9
59
15.5
7.7
68
0.85
V
DD
10V
15V
20V
Typ.
12
65
16.5
8.3
75
1.15
Min.
217
269
314
Max.
20
71
17.5
8.9
82
1.45
Typ.
247
302
349
Unit
V
kHz
V
V
%
mA
Max.
281
338
388
Conditions
Derating Curve
Derating curve
0.8
0.7
−
I
FB
=0.5mA
V
DD
=0→17.5V
V
DD
=17.5→0V
I
FB
=0.5mA
I
FB
=0→1.55mA
Unit
mA
Conditions
V
D
=0→15V
SW1=R2
Allowable loss / W
0.6
0.5
0.4
0.3
0.2
0.1
0
-30
-10
10
30
Tsmax=105
°
C
Operation range
50
70
90
Ambient Templature Ta /
°
C
Conversion Efficiency
(In case of 12V output)
Conversion efficiency
(Vi=311V, Ta=25
°
C)
Application Circuit (In case of 12V output)
Conversion efficiency / %
F1
90
80
70
60
50
40
30
20
10
0
0
200
400
600
800
1000
Be sure to use fuse for safety.
FL1
DB
C2
C3
R1
+
C4
NP
D2
F2
3
2
1
NS
T1
D4
C1
12V/0.5A(100V )
12V/1A(200V )
Vo
+
C7
GND
ZNR1
R2
R3
AC80 to 154V(100V )
AC154V to 286V(200V )
BP5728
6
D3
Output current / mA
IC1
C5
ND
C13
R5
IC2
R4
R6
Pin
No. Terminal name
1
COM
FB
V
DD
V
D
2
3
6
Terminal function
Common terminal at primary side
Feed back terminal
Drain terminal for built-in FET
Power supply terminal for internal drive
Load regulation
(In case of 12V output)
Output charasteristic
(Vi=311V, Ta=25
°
C)
+
R7
C12 R9
PC1
R8
Operating Principle
1.When turned on
: C5 is charged by R2 when the power is on, and the switching starts
0
500
1000
1500
Output current / mA
when the voltage at V
DD
pin reaches the voltage threshold (17.5V max.)
2.During operation
: Vdd is supplied via Nd and FB current flows to PC1 once Vo exceeds the threshold voltage. Once PC1
turns ON a current Ioz flows through the transistor.
Also, FB current runs to Pin 2 of BP5728 when Vo exceeds the designed voltage and the constant voltage control is executed.
3.In overcurrent conditions : The input current will increase if the output power increases, and the overcurrent protection circuit will turn
ON once the Drain current exceeds the specified value (Idocp).
14
12
10
8
6
4
2
0
Output voltage / V
External Component Specifications
C1,C2 : Noise reduction capacitors
C3 : Input smoothing capacitor
C4 : Noise reduction capacitor
C5 : Vdd smoothing capacitor
C7 : Output capacitor
C12 : Phase compensation capacitor
C13 : Noise reduction capacitor
D2 : Rectifier diode
D3 : Rectifier diode
D4 : Rectifier diode
DB : Diode bridge
F1.F2 : Fuse
IC1 : BP5728
Rated at 300VAC or higher
0.1 to 0.22µF
22µF / 450V
2200pF / 1kV
10µF / 50V
470µF / 35V low impedance
0.1µF / 50V
2200pF / AC250V
FRD 800V / 0.5A
80V / 0.1A
SBD 90V / 3A
800V / 1A
Use for safety
BP5728
IC2 :
FL1 :
R1 :
R2 :
R3 :
R4 :
R5 :
R6 :
R7 :
R8 :
R9 :
PC1 :
T1 :
ZNR1 :
Shunt regulator
Noise reduction filter
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Photo coupler
Switching transformer
Varistor
Vref=2.495V
Use if necessary
0Ω
750kΩ 0.5W / 600V
200kΩ / 3W
51Ω / 0.125W
1kΩ / 0.1W
15kΩ / 0.1W
3kΩ / 0.1W
4.7kΩ / 0.1W
1kΩ / 0.1W
PC817
SRW25ES-47V015(TDK)
A varistor is required to protect against
lightning surges and static electricity.
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©2010 ROHM Co., Ltd. All rights reserved.
1/1
2010.01 - Rev.A
MARKING SIDE
2000
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