Max.
鈭?/div>
Unit
V
V
V
mA
mV
mV
mVpp
%
Conditions
Note 2:Io=1000mA
DC, Io=1000mA *1
See derating curve
Vi=113V to 195VDC
Io=1000mA
Io=50mA to 1000mA
*2
Derating Curve
Output Power (W)
12
6
Operation Range
-30-20-10 0 10 20 30 40 50 60 70 80 90
Ambient Temperature Ta(
擄C
)
Switching Frequency fsw(kHz)
*1: The operation starting voltage is between 15.5 and 17.5 V.
*2: Pulsating noise is not included.
Switching Frequency
100
80
60
40
20
0
0
200
400
600
800
1000
Sample Application Circuit
Vi(+) R5
AC100V
ZNR
F1
Vi(-)
Use a fuse for safety
C5
D7
+
Pin
No.
D1
+
Terminal
name
Vo
Terminal function
Secondary 12V output
voltage control terminal.
Insert a 1000碌F output
smoothing capacitor before the
GND for use.
Secondary 12V output GND
terminal.
Primary input negative
terminal.
Internal circuit power terminal.
Start-up terminal. Connect to
Vi (+) through an external
resistor (1.5M鈩?.
NC pin.
Drain terminal for the buiit-in
FET.
T1
R1
C2
D2
D3
+
3
1
9
1
Vo1:12V/850mA
C1
GND1
Vo2:18V/100mA
GND2
1
C4
C7
R2
D5
6
7
+
2
6
7
8
9
11
GND
Vin(-)
VDD
Vs
NC
VD
C3
4
5
C6
Output Current Io(mA)
8
7
11
2
1
Conversion Efficiency
Conversion Efficiency
畏
(%)
100
90
80
70
60
50
40
30
20
10
0
0
BP5718A12
6
Verify proper operation under actual conditions
before use. In particular, confirm that
the load current does not exceed the maximum
rating.
500
1000
Output Current Io(mA)
External Component Settings
C1: Output Capacitor
C2:
C3:
C4:
C5:
C6:
C7:
D1:
D2:
1000碌F/35V low-impedance
capacitor for power supply
Noise Reduction Capacitor 2200pF/400V
V
DD
Capacitor
10碌F/50V low-impedance
capacitor for power supply
Input Capacitor
100碌F/250V
Noise Reduction Capacitor (optional)
Output Capacitor
100碌F/35V low-impedance
Noise Reduction Capacitor (optional)
Rectifier Diode
60V/6A
Rectifier Diode
1kV/1A
80V/0.1A
100V/1A
800V/1A
100k鈩β?%, 3W, 300VDC or
higher ruted voltage
R2: Resistor 2
1.5M鈩β?%, 0.25W, 300VDC or
higher ruted voltage.
R5: Noise Reduction Resistor (optional)
T1: Switching Transformer
F1: Fuse
Use a fuse for safety
ZNR: Varistor
A varistor is required in order to
protect against lightning surges and
static electricity.
D3:
D5:
D7:
R1:
Rectifier Diode
Rectifier Diode
Diode Bridge
Resistor 1
Load Regulation
Output Voltage Vo(V)
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
0
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 2200碌F is recommended, with a rise time of 10ms or less.
The capacitance of C3 should be 10碌F, since an excessively small value will result in malfunction. The activation time is defined as: t(sec)=R2
脳
C3
脳
ln[1-17/(VI-30碌A(chǔ)
脳
R2)], where VI is the
DC voltage after smoothing.
The resistance of R2 should be 1.5M鈩? 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 V
DD
exceeds 20V. In order to reset the input capacitor C4 must be discharged and the power turned back on.
1
2
3
