SR03 Datasheet, PDF (1/18 Pages) Supertex, Inc – Inductorless, Dual Output Off-Line Regulators

SR036/S_SR_R0₀3₃7₆
SR037
Inductorless, Dual Output Off-Line Regulators
Features
General Description
❑ Accepts peak input voltages up to 700V
The Supertex SR036 and SR037 are inductorless, dual output
❑ Operates directly off of rectified 120V AC or 230V AC
off-line controllers, providing up to 1.0W of output power. They
❑ Integrated linear regulator
❑ Minimal power dissipation
❑ No high voltage capacitors required
Not ^{Recommended ❑ Notransformersorinductorsrequired}
❑ Up to 1.0W output power
Applications
❑ 3.3V or 5.0V power supplies
Designs! ^{❑ SMPShousekeepingpowersupplies}
❑ White goods
❑ Appliances
❑ Small off-line low voltage power supplies
❑ Lighting controls
do not require any transformers, inductors, or high voltage
input capacitors. The input voltage, HV_IN, is designed to
operate from an unfiltered full wave rectified 120V or 230V AC
line. It is designed to control an external N-channel MOSFET
or IGBT. When HV_IN is less than 45V, the external transistor is
turned-on allowing it to charge an external capacitor connected
to V_SOURCE. An unregulated DC voltage will develop on V_SOURCE.
Once HV_IN is above 45V, the transistor is turned off. The
maximum gate voltage for the external transistor 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.
For ^{New SR03x Typical Application Circuit}
GN2470
1.0µF
~18V Unregulated
470µF
120VAC
or
230VAC
HVIN
SR036
or SR037
VSOURCE
VOUT
SR036: V_OUT = 3.3V Regulated
SR037: V_OUT = 5.0V Regulated
1.0µF
B092005
B092005
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