SR036 Supertex Inc, SR036 Datasheet - Page 5

• Manufacturer Part Number: SR036
• Description: Inductorless / Dual Output Off-Line Regulators
• Manufacturer: Supertex Inc

Applications Information, continued
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
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
Figure 2: Example Circuit with Enable Control
Figure 3: Generating Two Regulated Voltages
120VAC
240VAC
or
120VAC
240VAC
or
Fuse
Fuse
ON/OFF
VN2460N8
HV
IN
Gate
SR036
GND
Source
5
TN2106K1
V
1KΩ
OUT
output current is typically 40mA. The TN2106K1 in series with a
1KΩ resistor can be added for applications requiring an enable
control.
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.
VN2460N8
HV
220µF
1µF
IN
or SR037
Gate
SR036
GND
10KΩ
Source
Vz
5.6V
V
2N3904
OUT
220µF
1µF
1MΩ
I
(
OUT
I
UNREG +
1µF
V
V
typical 40mA
UNREG
REG
I
REG)
V
V
out1
SR036/SR037
out2
=5.0V
=3.3V