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SR087

Adjustable Off-line Inductorless Switching Regulator

Status: In Production

Features:

  • Efficient operation without magnetics
  • No high voltage capacitors
  • Adjustable main output voltage (9.0 to 50V)
  • Additional 5.0V internal regulator
  • Up to 100mA combined output current
  • Single BOM for 120VAC/230VAC
  • Built-in soft start
  • Less than 200mW standby power
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

SR087 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 5.0V 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 SR087 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 SR087 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.

Additional Features
  • Efficient operation without magnetics
  • No high voltage capacitors
  • Adjustable main output voltage (9.0 to 50V)
  • Additional 5.0V internal regulator
  • Up to 100mA combined output current
  • Single BOM for 120VAC/230VAC
  • Built-in soft start
  • Less than 200mW standby power
Parametrics
Name
Value
Vin (VAC)
80 - 285
Adj Vout(V)
9.0 - 50
Fixed Vout(V)
5
Iout Max (mA)
100
Load Regulation (%/mA)
0.017
Package
SOIC-8 w/HS

Documents

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703KB

Development Environment

  • Demo & Evaluation Boards
Demo & Evaluation Boards
SR087DB1 ???V Ind.Less Switching Pwr Supply
SR087DB1 ???V Ind.Less Switching Pwr Supply ( ADM00947 )

The Supertex SR087DB1 is an inductorless switching power supply intended for operation directly from a 120/230VAC line. Two outputs, 12.6V and 5.0V are provided. The operating principle is to turn on a pass transistor when the rectified AC input is below the output voltage, and to turn it off when the output storage capacitor is charged up to the regulation point. Since the output capacitor...

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Similar Devices

Product
Vin (VAC)
Adj Vout(V)
Fixed Vout(V)
Iout Max (mA)
Price 5K
80 - 285
9.0 - 50
3.3
100
$0.83
80 - 285
9.0 - 50
5
100
$0.83
80 - 285
6.0 - 28
6.0, 12, 24
60
$0.37

RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
SR087SG-G
0.078000
0.206061
8
SOIC
3.90mm(.150in)
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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