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TOP225YN 数据手册 - Power Integrations（帕沃英蒂格盛）
制造商:
Power Integrations（帕沃英蒂格盛）
分类:
AC-DC转换器
封装:
TO-220-3
描述:
POWER INTEGRATIONS TOP225YN 芯片, PWM开关
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TOP225YN数据手册
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Rev. G 08/16
6
TOP221-227
www.power.com
Figure 7. Schematic Diagram of a 4 W TOPSwitch-II Standby Power Supply using an 8 lead PDIP.
Application Examples
Following are just two of the many possible TOPSwitch
implementations. Refer to the Data Book and Design Guide
for additional examples.
4 W Standby Supply using 8 Lead PDIP
Figure 7 shows a 4 W standby supply. This supply is used
in appliances where certain standby functions (e.g. real time
clock, remote control port) must be kept active even while
the main power supply is turned off.
The 5 V secondary is used to supply the standby function
and the 12 V non-isolated output is used to supply power
for the PWM controller of the main power supply and other
primary side functions.
For this application the input rectifiers and input filter are
sized for the main supply and are not shown. The input DC
rail may vary from 100 V to 380 V DC which corresponds to
the full universal AC input range. The TOP221 is packaged in
an 8 pin power DIP package.
The output voltage (5 V) is directly sensed by the Zener
diode (VR1) and the optocoupler (U2). The output voltage is
determined by the sum of the Zener voltage and the volt-
age drop across the LED of the optocoupler (the voltage
drop across R1 is negligible). The output transistor of the
optocoupler drives the CONTROL pin of the TOP221. C5
bypasses the CONTROL pin and provides control loop com-
pensation and sets the auto-restart frequency.
The transformer’s leakage inductance voltage spikes are
snubbed by R3 and C1 through diode D1. The bias winding
is rectified and filtered by D3 and C4 providing a non-isolat-
ed 12 V output which is also used to bias the collector of the
optocoupler’s output transistor. The isolated 5 V output wind-
ing is rectified by D2 and filtered by C2, L1 and C3.
Wide-Range
DC Input
D
S
C
CONTROL
PI-2115-040401
+
-
R3
47 kΩ
D1
UF4005
C1
2.2 nF
1 kV
D2
UF5401
TOP221P
L1
3.3 µH
D3
1N4148
C4
100 µF
16 V
U2
PC817A
R1
10 Ω
C3
100 µF
10 V
+5 V
C5
47 µF
10 V
C2
330 µF
10 V
U1
R2
100 Ω
VR1
TOPSwitch-II
T1
RTN
+
-
12 V Non-Isolated
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