SR036/SR037
Applications Information, continued
VN2460N8
Fuse
VUNREG
220µF
120VAC
or
240VAC
1KΩ
IOUT typical 40mA
IUNREG
(
+ IREG)
Gate
Source
VOUT
HVIN
SR036
or SR037
VREG
1µF
GND
ON/OFF
TN2106K1
Figure 2: Example Circuit with Enable Control
Figure 2 is an example circuit using the SR036 or SR037 along
with a Supertex VN2460N8 MOSFET to generate an unregu-
lated voltage of approximately 18V and a regulated voltage of
3.3V for the SR036 or 5.0V for the SR037. The combined total
output current is typically 40mA. The TN2106K1 in series with a
1KΩ resistor can be added for applications requiring an enable
control.
VN2460N8
2N3904
Fuse
Vout1=5.0V
220µF
10KΩ
1MΩ
1µF
120VAC
or
240VAC
Vz
5.6V
Gate
Source
VOUT
HVIN
SR036
Vout2=3.3V
1µF
GND
Figure 3: Generating Two Regulated Voltages
For applications requiring two regulated voltages, an inexpen-
sive discrete linear regulator can be added to regulate the
unregulated output as show in Figure 3. The discrete linear
regulator consists of a Zener diode, a resistor and a bipolar
transistor. The regulated voltage, Vout1, is determined by the
Zener diode voltage minus the base-to-emitter voltage drop of
0.6V. Figure 3 uses a 5.6V Zener diode to obtain a 5.0V output.
Different Zener diode voltages can be used to obtain different
regulated output voltages.
5
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