SR036 Supertex Inc, SR036 Datasheet - Page 7

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

Applications Information, continued
The circuit shown in Figure 6 uses the SR037 to supply a
regulated 5.0V for the logic control circuitry. A 5.1V Zener diode
is used in parallel with the 5.0V relay coil to ensure that the relay
coil’s maximum operating voltage is not exceeded. The Zener
The circuit shown in Figure 7 uses the SR036 or SR037 to drive
12 high efficient red LEDs from a 120V AC line. The average LED
current is approximately 20mA.
©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
Figure 6: Driving 5V Relay Coils with Zener Diode Clamp
Figure 7: Driving LEDs from 120VAC
120VAC
240VAC
120VAC
or
Fuse
Fuse
VN2460N8
HV
IN
TN2425N8
HV
Gate
SR037
IN
SR036 or
GND
Gate
SR037
Source
GND
V
OUT
7
Source
5.0V
V
OUT
diode also acts as the catch diode when the coil is switched to the
off state. An external series resistor is used to limit the amount
of Zener current.
1µF
220µF
Unregulated Voltage
Unregulated Voltage
1µF
220µF
Control
Circuit
Logic
V
REG
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: [phone] • FAX: [phone]
Vz
5.1V
330Ω
5V Coil
Relay
330Ω
www.supertex.com
SR036/SR037
06/13/02rev.12