BP5728 Datasheet, PDF (1/4 Pages) Rohm – Isolated AC/DC Converter

Data Sheet
100-200VAC Input/12W Output
Isolated AC/DC Converter
BP5728
Absolute Maximum Ratings
Dimensions (Unit : mm)
Parameter
Symbol
Limits
Unit
6pin Input Voltage
VD
800
V
2pin Input Voltage
VFB
−0.2 to +6
V
3pin Input Voltage
VDD
24
V
3pin Input Current
IDD
8
mA
Allowable Loss
PD
0.64
W
Max Surface Temperature
Tcmax
105
°C
Operating Temperature Range
Topr
−25 to +80
°C
Storage Temperature Range
Tstg
−25 to +105
°C
Electrical Characteristics
(VDD=15V, Vd=15V,IFB=0.1mA,SW1=R1,Ta=25°C, unless otherwise specified)
Parameter
Symbol Min.
Typ.
Max.
Unit
Conditions
Input voltage
VDD
8.9
12
20
V−
Output frequency
fo
59
65
71
kHz IFB=0.5mA
Turn on voltage
VDD on 15.5
16.5
17.5
V
VDD=0→17.5V
Turn off voltage
VDD off
7.7
8.3
8.9
V
VDD=17.5→0V
Maximum Duty
Duty MAX 68
75
82
%
IFB=0.5mA
Zero-Duty IFB
Ioz
0.85
1.15
1.45
mA IFB=0→1.55mA
Parameter
Over drain current
protection
Symbol VDD
10V
Idocp
15V
20V
Min.
Typ.
Max.
Unit Conditions
217
247
281
VD=0→15V
269
302
338
mA SW1=R2
314
349
388
18.8MAX.
9.9MAX.
MARKING SIDE
3.25MAX.
12 3
0.5±0.1
1.3±0.2
2.54±0.2
2.54X5=12.7TYP.
6
5.55MAX.
0.25±0.05
4.35MAX.
Derating Curve
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-30
Derating curve
Tsmax=105°C
Operation range
-10 10 30 50 70 90
Ambient Templature Ta / °C
Conversion Efficiency
(In case of 12V output)
Application Circuit (In case of 12V output)
F1
Be sure to use fuse for safety.
12V/0.5A(100V )
FL1
DB
R1
T1 D4
12V/1A(200V )
ZNR1
C1
C2
Vo
C4
AC80 to 154V(100V )
C3
R2 R3
NP
NS
C7
AC154V to 286V(200V )
6
F2
D2
D3
GND
3
2
1
C5
ND
IC1
R4
R6
NPion. ^{Terminal name}
Terminal function
1 COM Common terminal at primary side
C13
R7
2
FB
Feed back terminal
90
80
70
60
50
40
30
20
10
0
0
Conversion efficiency
(Vi=311V, Ta=25°C)
200
400
600
800
Output current / mA
1000
Load regulation
(In case of 12V output)
Output charasteristic
(Vi=311V, Ta=25°C)
Operating Principle
1.When turned on
R5
C12 R9
PC1
IC2
R8
3
VDD
Power supply terminal for internal drive
6
VD
Drain terminal for built-in FET
: C5 is charged by R2 when the power is on, and the switching starts
14
12
10
8
6
4
2
0
0
500
1000
1500
2000
when the voltage at VDD pin reaches the voltage threshold (17.5V max.)
Output current / mA
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).
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 : Shunt regulator
FL1 : Noise reduction filter
R1 : Resistor
R2 : Resistor
R3 : Resistor
R4 : Resistor
R5 : Resistor
R6 : Resistor
R7 : Resistor
R8 : Resistor
R9 : Resistor
PC1 : Photo coupler
T1 : Switching transformer
ZNR1 : 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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2010.01 - Rev.A