sr087 Supertex, Inc., sr087 Datasheet

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sr087

Manufacturer Part Number
sr087
Description
Adjustable Off-line Inductorless Switching Regulator
Manufacturer
Supertex, Inc.
Datasheet

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sr087SG-G
Manufacturer:
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Supertex inc.
Features
Applications
Typical Application Circuit
50/60HZ
270VAC
90VAC
Supertex inc.
Effi cient operation without magnetics
No high voltage capacitors
Adjustable main output voltage (9V to 50V)
Additional 3.3V or 5V internal regulator
Up to 100mA combined output current
Single BOM for 120VAC/230VAC
Built-in soft start
Less than 200mW standby power
White goods
Household appliances
Lighting controls
Circuit breakers
Keep-alive supplies
to
1.25A
275V
50A
·
1235 Bordeaux Drive, Sunnyvale, CA 94089
Inductorless Switching Regulator
390k
1.0kV
1A
Enable
Adjustable Off-Line
STGD5NB120SZ
1.1M
V
EN
GATE
IN
1
SR08x
General Description
The Supertex SR08x is an inductorless switching regulator
designed to operate directly from a rectifi ed AC line. The
operating principle is to turn on a pass transistor when the
rectifi ed AC is below the output voltage, and to turn it off when
the output voltage reaches a specifi c level. A linear regulator
supplied by V
(SR086) or 5V output (SR087). Effi ciencies of around 55%
may be realized for loads up to 1W in 120VAC applications,
with around 50% effi ciencies for loads up to 800mW in 230VAC
applications.
A logic-level enable input allows the SR08x to be disabled
– useful when the SR08x 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 SR08x
to ensure adequate safeguards are in place to protect the
end user from electrical shock.
·
GND
V
Tel: (408) 222-8888
GD
100nF
V
V
OUT
REG
OUT
FB
provides an additional fi xed 3.3V output
·
1 F
FAX: (408) 222-4895
100nF
3.3V or 5V
@ 60mA
470 F
SR086/SR087
9-50VDC
@ 100mA - I
V
OUT
Initial Release
·
www.supertex.com
12.4k
R
R
= R
2
1
2
1.25V
V
REG
OUT
NR040306
-
1

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sr087 Summary of contents

Page 1

... AC is below the output voltage, and to turn it off when the output voltage reaches a specifi c level. A linear regulator supplied by V (SR086 output (SR087). Effi ciencies of around 55% may be realized for loads 120VAC applications, with around 50% effi ciencies for loads up to 800mW in 230VAC applications ...

Page 2

... Ordering Options Package Options Device (V ) REG 8-Lead SOIC SR086 (3.3V) SR086SG-G SR087 (5.0V) SR087SG-G -G indicates package is RoHS compliant (‘Green’) Absolute Maximum Ratings Parameter Output Voltage (V ) OUT Feedback Voltage ( Enable Voltage ( Operating Junction Temperature Absolute Maximum Ratings are those values beyond which damage to the device may occur ...

Page 3

... STGD5NB120SZ 390k GD 1.1M V GATE IN 13V Upper circuitry level powered translator GD OUT Lower circuitry powered by V GND OUT EN SR08x 3 SR086/SR087 Units Conditions nA --- V --- V --- - V --- V --- REG µ 1nF GATE 1nF GATE 1nF V = 1.5V GATE 1mA ...

Page 4

... V +V OUT TRIP(ON) Pass Transistor OUT Pass Transistor is Pass Transistor is on but on and conducting not conducting since the input voltage is lower than the output voltage 4 SR086/SR087 not to scale Pass Transistor is turned off once V OUT reaches the trip point NR040306 ...

Page 5

... Due to feedback hysteresis, ripple cannot be reduced below 4%. V RIPPLE requires at least 4V of headroom. Therefore, V REG must not fall below 9V for the SR087, or below 7.3V for the SR086 − cos ...

Page 6

... V LOAD OUT UPS The SR08x will not operate from uninterruptable power supplies having a square wave output. This type of output is usually referred to as ‘modifi ed sine wave’ OUT REG 6 SR086/SR087 2 R, the fuse must be RMS . RMS . OUT (I REG REG + I REG ...

Page 7

... 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. ©2006 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP - SR086_SR087 NR040306 0.1535 ...

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