SR036MG データシートの表示（PDF） - Supertex Inc
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SR036MG Datasheet PDF : 19 Pages
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Applications Information, continued
SR036/SR037
120VA C
or
230VA C
Fuse
GN2470
Unregulated Voltage
220µF
1.0µF
1N4001
Gate Source
HVIN SR036
VOUT3.3V
GND
1.0µF
Logic
Control
Circuit
12V Coil
Relay
VN2110K1
Figure 4: Driving 12V Relay Coils
The circuit shown in Figure 4 uses the SR036 to supply a
regulated 3.3V for the logic control circuitry while the unregulated
voltage is used to drive a 12V relay coil. The operating voltage
for a 12V relay coil is typically very wide and can therefore
operate directly from the unregulated line.
120VAC
or
230VAC
Fuse
GN2470
Unregulated Voltage
220µF
1.0µF
1N4001
Gate Source
HVIN
VOUT 5.0V
SR037
Logic
Control
Circuit
GND
1.0µF
1KΩ
5V Coil
Relay
2N3904
100Ω
Figure 5: Driving 5V Relay Coils
The circuit shown in Figure 5 uses the SR037 to supply a
regulated 5.0V for the logic control circuitry while the unregulated
voltage is used to drive a 5.0V coil relay. To overcome the voltage
variation of the unregulated line, a bipolar transistor is used to
drive the coil with a constant current. The resistor value from the
emitter to ground sets the desired coil current. For an arbitrary
coil current of 40mA, the resistor value can be calculated as:
10
B092005
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