BP5718A12_10 Datasheet, PDF (1/4 Pages) Rohm – Isolated AC/DC Converter

Data Sheet
100VAC Input/12VDC (1A) Output
Isolated AC/DC Converter
BP5718A12
Absolute Maximum Ratings
Parameter
Symbol
Limits
Unit
Conditions
Pin 11 input voltage
VD
500
V
Pin 7,8 input voltage
VDD
25
V
Pin 11 input Current
ID
500
mA
Pin 8 input Current
IDD
10
mA
Output power
Po
13
W
Withstand voltage
VI
2.5
kW
1 sec (between primary and secondary)
Maximum allowable
surface temperature
Tcmax
105
°C
Ambient temperature + module
self-heating Tcmax
Operating
temperature range
Topr −25 to +80
°C
Storage temperature
range
Tstg −40 to +105
°C
Electrical Characteristics
Parameter
Symbol Min.
Typ.
Max.
Pin 11 input voltage VD
−
−
350
Operating power
voltage (Pin 7)
VDD
8.8
12
20
Rated output voltage Vo
Rated output current Io
11.4 12.0 12.6
0
−
1000
Line regulation
∆ Vr
−
5
200
Load regulation
∆ VI
−
58
200
Output ripple voltage ∆γ
−
135
500
Power conversion
efficiency
η
75
83
−
*1: The operation starting voltage is between 15.5 and 17.5 V.
*2: Pulsating noise is not included.
Unit
V
V
V
mA
mV
mV
mVpp
%
Conditions
Io=1000mA
DC, Io=1000mA *1
Refer to derating curve
Vi=113V to 195VDC
Io=1000mA
Io=50mA to 1000mA
*2
Sample Application Circuit
Vi(+) R5
T1 D1
AC100V D7
ZNR
F1
C4 C7 R2
Vi(-)
Use a fuse for safety
87
39
R1
C2
C1
D2 1
D3
1
0 _D5
C3 ⁴
6
C6
57
C5
11
BP5718A12
6
External Component Settings
*C1: Output smoothing capacitor 1000µF/35V Low-impedance
type
C2: Noise reduction capacitor 2200pF/400V or higher
*C3: Output smoothing capacitor 10µF/50V Low-impedance
type
C4: Input smoothing capacitor 100µF/250V
C5: Noise reduction capacitor Use if necessary
C6: Output smoothing capacitor 100µF/35V Low-impedance
type
C7: Noise reduction capacitor Use if necessary
Limiting element voltage 250V or
higher 0.1 to 0.22µF
D1: Rectifier Diode
60V/6A
D2: Rectifier Diode
1kV/1A
*C1, C3, R2:Refer to directions
21
Vo1:12V/850mA
GND1
Vo2:18V/100mA
GND2
Pin Terminal
No. name
Terminal function
Secondary 12V output
voltage control terminal.
1
Vo Insert a 1000µF output
smoothing capacitor before the
GND for use.
2
GND
Secondary 12V output GND
terminal.
6
Vi(-)
Primary input negative
terminal.
7
VDD Internal circuit power terminal.
Start-up terminal. Connect to
8
Vs Vi (+) through an external
resistor (1.5MΩ).
9
NC NC pin.
11
VD
Drain terminal for the built-in
FET.
Verify proper operation under actual conditions
before use. In particular, confirm that the load
current does not exceed the maximum rating.
D3: Rectifier Diode
D5: Rectifier Diode
D7: Diode Bridge
R1: Resistor
*R2: Resistor
R5: Noise reduction resistor
T1: Switching Transformer
F1: Fuse
ZNR: Varistor
80V/0.1A
100V or higher /1A
800V/1A
100kΩ±5%, 3W
Limiting element voltage 300V or higher
1.5MΩ±5%, 0.25W
Limiting element voltage 300V or higher
Use if necessary
1W or higher 10 to 22Ω
Be sure to use this for safety.
A varistor is required to protect against
lightning surges and static electricity.
Dimensions (Unit : mm)
Derating Curve
12
6
Operation Range
-30-20-10 0 10 20 30 40 50 60 70 80 90
Ambient Temperature Ta(°C)
Switching Frequency
100
80
60
40
20
0
0
200 400 600 800 1000
Output Current Io(mA)
Conversion Efficiency
100
90
80
70
60
50
40
30
20
10
0
0
500
1000
Output Current Io(mA)
Load Regulation
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
0
Maximum
Io=1000mA
1000
2200
Output Current Io(mA)
Operation Notes
An excessively large capacitance at C1 may cause the output to become inactive. Therefore, a capacitance between 1000 and 2200µF is recommended, with a rise time of 10ms or
less.
The capacitance of C3 should be 10µF, since an excessively small value will result in malfunction. The activation time is defined as: t(sec)=R2�C3�ln[1-17/(VI-30µA�R2)], where VI
is the DC voltage after smoothing.
The resistance of R2 should be 1.5MΩ, since an excessively small value will result in malfunction.
Overcurrent (reset type) and overvoltage (latch type) protection circuits are built in, preventing damage from occurring due to unexpected conditions. The overvoltage protection
circuit shuts down operation once VDD exceeds 20V. In order to reset the input capacitor C4 must be discharged and the power turned back on.
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2010.01 - Rev.A