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SR086 fiches techniques PDF

Supertex Inc - Adjustable Off-Line Inductorless Switching Regulator

Numéro de référence SR086
Description Adjustable Off-Line Inductorless Switching Regulator
Fabricant Supertex Inc 
Logo Supertex Inc 





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SR086 fiche technique
Supertex inc.
SR086
Adjustable Off-Line
Inductorless Switching Regulator
Features
Efficient operation without magnetics
No high voltage capacitors
Adjustable main output voltage (9.0 to 50V)
Additional 3.3V internal regulator
Up to 100mA combined output current
Single BOM for 120VAC/230VAC
Built-in soft start
Less than 200mW standby power
Applications
White goods
Household appliances
Lighting controls
Circuit breakers
Keep-alive supplies
General Description
The Supertex SR086 is an inductorless switching regulator designed
to operate directly from a rectified AC line. The operating principle is
to turn on a pass transistor when the rectified AC is below the output
voltage, and to turn it off when the output voltage reaches a specific
level. A linear regulator supplied by VOUT provides an additional fixed
3.3V output. Efficiencies of around 55% may be realized for loads
up to 1.0W in 120VAC applications, with around 50% efficiencies for
loads up to 800mW in 230VAC applications.
A logic-level enable input allows the SR086 to be disabled – useful
when it is employed as a keep-alive power supply.
WARNING! Galvanic isolation is not provided. Dangerous
voltages are present when connected to the AC line. It is the
responsibility of the designer employing the SR086 to ensure
adequate safeguards are in place to protect the end user from
electrical shock.
The circuits shown in this datasheet are not guaranteed to meet
surge and conducted EMI requirements. The effectiveness of these
circuits may vary with a particular application. The designer should
conduct tests to ascertain compliance with applicable standards and
regulations.
Typical Application Circuit
90 to
270VAC
50/60Hz
1.25A
275V
50A
1.0kV
1.0A STGD5NB120SZ
390kΩ
1.1MΩ
100nF
1.0µF
470µF
Enable
GATE VGD VOUT
VIN FB
SR086
EN VREG
GND
3.3V
@60mA
100nF
VOUT
9.0 - 50VDC
@100mA - IREG
R1 = R2
VOUT - 1
1.25V
R122.4kΩ
Doc.# DSFP-SR086
D080613
Supertex inc.
www.supertex.com

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