sr086 Supertex, Inc., sr086 Datasheet

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sr086

Manufacturer Part Number
sr086
Description
Adjustable Off-line Inductorless Switching Regulator
Manufacturer
Supertex, Inc.
Datasheet
Features
Applications
Typical Application Circuit
Effi cient 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
White goods
Household appliances
Lighting controls
Circuit breakers
Keep-alive supplies
Inductorless Switching Regulator
Adjustable Off-Line
General Description
The Supertex SR086 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
3.3V output. Effi ciencies of around 55% may be realized for loads
up to 1.0W in 120VAC applications, with around 50% effi ciencies 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.
OUT
provides an additional fi xed
SR086

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sr086 Summary of contents

Page 1

... Effi ciencies of around 55% may be realized for loads up to 1.0W in 120VAC applications, with around 50% effi ciencies 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 ...

Page 2

... SOIC w/ Heat Slug (SG) (top view Year Sealed YYWW WW = Week Sealed L = Lot Number “Green” Packaging 8-Lead SOIC w/ Heat Slug (SG) Typ Max Units Conditions - 50 V --- - - µA --- - - V --- Max Units Conditions 60 µA --- 400 µ 9.0 - 50V OUT 15 V --- 15 V --- 0.5 V --- 1.31 V --- - mV --- 500 nA --- 3.0 V --- SR086 ...

Page 3

... V load regulation I REG REG V Gate - V diode drop Referenced to V OUT. Block Diagram Min Typ 1 9 3.125 3.300 - SR086 Max Units Conditions 15 V --- - V --- 0.75 V --- REG 1.0 µ 1.0nF Gate 600 1.0nF Gate 450 1.0nF V = 1.5V Gate FB 3.465 1.0mA, V LOAD OUT 0mA < ...

Page 4

... SR086 Timing 4 SR086 ...

Page 5

... Output Voltage* V may be adjusted in the range 50V*‚ by changing OUT feedback resistor R according to the following equation. 5 Leave R at 12.4kΩ or less - it assures a minimum 100µA 6 load required for the proper operation of the SR086. Change R and R according to the and C with appropriate voltage ratings ...

Page 6

... I must be sized for the RMS current, not the average current. For a 1.0W load and 120VAC the RMS current is 700mA and for a 0.5W load at 230VAC it is 360mA Load Total load on the SR086 is the total load current drawn from V (I OUT OUT ...

Page 7

... TVS or MOV device. Since the recommended IGBT is rated at 1.2kV and the SR086 never sees the full input voltage, the bridge rectifi er becomes the limiting element when selecting an MOV. If using a 1.0kV bridge, an MOV having a clamping voltage of < ...

Page 8

... This dimension is not specifi the original JEDEC drawing. The value listed is for reference only. Drawings are not to scale. (The package drawing(s) in this data sheet may not refl ect the most current specifi cations. For the latest package outline information go to http://www.supertex.com/packaging.html.) Doc.# DSFP-SR086 A012808 D1 8 ...

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