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Supertex Inc - Inductorless / Dual Output Off-Line Regulators

Numéro de référence SR036
Description Inductorless / Dual Output Off-Line Regulators
Fabricant Supertex Inc 
Logo Supertex  Inc 





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SR036 fiche technique
SR036/SR037
SR036
SR037
Demo Kit
Available
Inductorless, Dual Output Off-Line Regulators
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
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,
HVIN, is designed to operate from an unfiltered full wave
rectified 120V or 240V AC line. It is designed to control an
external N-channel MOSFET. When HVIN is between VGS(th) to
40V, where VGS(th) is the threshold voltage of the external
MOSFET, the external N-channel MOSFET is turned on allowing
it to charge an external capacitor connected to VSOURCE. An
unregulated DC voltage will develop on VSOURCE. Once HVIN is
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.
SR03x Typical Application Circuit
120VAC
or
240VAC
~18V Unregulated
100µF
SR036
or SR037
VSOURCE
VOUT
SR036: VOUT=3.3V Regulated
SR037: VOUT=5.0V Regulated
1.0µF
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 prod1ucts, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.

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