RD5 データシートの表示（PDF） - Power Integrations, Inc
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RD5
Power Integrations, Inc
RD5 Datasheet PDF : 12 Pages
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RD5
VR1
P6KE200
L2
19 mH
C6
0.1 µF
250 VAC
BR1
600 V
C1
47 µF
400 V
F1
J1 3.15 A
L
N
D1
UF4005
D TOPSwitch-II
CONTROL
C
S
U1
TOP224P
C5
47 µF
Figure 3. Schematic Diagram of the 12V RD5 Power Supply.
1
D2
7, 8 50SQ100
C2
560 µF
35 V
5, 6
2
4
T1 3
D3
1N4148
C4
0.1 µF
R3
6.8 Ω
C7
1 nF
250 VAC
Y1
L1
3.3 µH
C3
220 µF
35 V
+12V
RTN
R1
39 Ω
U2
PC817A
R2
150 Ω
VR2
1N5241B
11 V
PI-2053-041698
BR1
VR1
C1
D2
D1
C2
L1
L2
T1
C6
POWER
U1
R2
INTEGRATIONS
INC.
C4
J1 F1
RD5
Rev. A
C7
VR2
R1
J2
+
R3
S/N
C3
C5
D3 U2
COMPONENT SIDE SHOWN
Figure 4. Component Legend of the RD5.
PI-2059-062697
General Circuit Description
The RD5 is a low-cost, flyback switching power supply using
the TOP224P integrated circuit. The circuit shown in Figure 3
produces a 12 V, 20 W power supply that operates from 85 to
265 VAC input voltage. The 12 V output is directly sensed by
optocoupler U2 and Zener diode VR2. The output voltage is
determined by the Zener diode (VR2) voltage and the voltage
drops across the optocoupler (U2) LED and resistor R1. Other
output voltages are also possible by adjusting the transformer
turns ratios and value of Zener diode VR2.
AC power is rectified and filtered by BR1 and C1 to create the
high voltage DC bus applied to the primary winding of T1. The
other side of the transformer primary is driven by the integrated
high-voltage MOSFET within the TOP224. D1 and VR1
clamp the leading-edge voltage spike caused by transformer
leakage inductance to a safe value and reduce ringing. The
34 A
7/97
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