SR036 Supertex Inc, SR036 Datasheet

SR036

Manufacturer Part Number

SR036

Description

Inductorless / Dual Output Off-Line Regulators

Manufacturer

Supertex Inc

Datasheet

1.SR036.pdf (7 pages)

Current page: 1 of 7
Download datasheet (491Kb)

Features

❑ Accepts peak input voltages up to 700V

❑ Operates directly off of rectified 120V AC or 240V AC

❑ Integrated linear regulator

❑ Minimal power dissipation

❑ No high voltage capacitors required

❑ No transformers or inductors required

Applications

❑ 3.3V or 5.0V power supplies

❑ SMPS house keeping power supplies

❑ White goods

❑ Appliances

❑ Small off-line low voltage power supplies

❑ Lighting controls

SR03x Typical Application Circuit

06/13/02

Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability

indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to

workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the

Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.

120VAC

240VAC

Inductorless, Dual Output Off-Line Regulators

or SR037

SR036

General Description

The Supertex SR036 and SR037 are inductorless, dual output

off-line controllers. They do not require any transformers,

inductors, or high voltage input capacitors. The input voltage,

rectified 120V or 240V AC line. It is designed to control an

external N-channel MOSFET. When HV

40V, where V

MOSFET, the external N-channel MOSFET is turned on allowing

it to charge an external capacitor connected to V

unregulated DC voltage will develop on V

above 45V, the N-channel MOSFET is turned off. The maximum

gate voltage for the external MOSFET is 24V. The unregulated

voltage is approximately 18V. The SR036 also provides a

regulated 3.3V whereas the SR037 provides a regulated 5.0V.

WARNING!!! Galvanic isolation is not provided. Dangerous

voltages are present when connected to the AC line. It is

the responsibility of the designer to assure adequate

safeguards are in place to protect the end user from

electrical shock.

, is designed to operate from an unfiltered full wave

OUT

GS(th)

SOURCE

is the threshold voltage of the external

100µF

1.0µF

SR036: V

SR037: V

18V Unregulated

OUT

=3.3V Regulated

=5.0V Regulated

SOURCE

is between V

SR036

SR037

SR036/SR037

. Once HV

SOURCE

GS(th)

. An

Related parts for SR036

SR036 Summary of contents

Page 1

... DC voltage will develop on V above 45V, the N-channel MOSFET is turned off. The maximum gate voltage for the external MOSFET is 24V. The unregulated voltage is approximately 18V. The SR036 also provides a regulated 3.3V whereas the SR037 provides a regulated 5.0V. WARNING!!! Galvanic isolation is not provided. Dangerous voltages are present when connected to the AC line ...

Page 2

... SR036/SR037 Gate Source V OUT N ...

Page 3

... HV (off -40 - 110 Temperature (°C) Gate Voltage (V) IN Load Regulation (SR037) 5.05 5.00 4.95 4.90 Source=15V 25°C 4.85 4.80 Source=8V 4.75 25°C 4.70 4. (mA) OUT SR036/SR037 140 ...

Page 4

... The amount of decay is determined by the load and the value of C1. Since the switch only conducts with low voltages across it, power dissipation is minimized UNREG V REG Figure 1: Typical Waveforms Functional Block Diagram HV Gate REF Switch ON 4 SR036/SR037 Source Reg V OUT GND not to scale ...

Page 5

... Fuse 120VAC or 240VAC Figure 2: Example Circuit with Enable Control Figure 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 Fuse ...

Page 6

... 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 unregu- lated 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 ...

Page 7

... The Zener Fuse 120VAC Figure 7: Driving LEDs from 120VAC 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. ...

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