Microchip SR087 Manual

Microchip Ikke kategoriseret SR087

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 2017 Microchip Technology Inc. DS20005544A-page 1

SR086/SR087

Features

• Efficient Operation without Magnetics

• No High-voltage Capacitors

• Adjustable Main Output Voltage (9V to 50V)

• Additional Internal Linear Regulator:

- 3.3V for SR086

- 5V for SR087

• Up to 100 mA Combined Output Current

• Single BOM for 120 VAC/230 VAC

• Built-in Soft Start

• Less than 200 mW Standby Power

Applications

• White Goods

• Household Appliances

• Lighting Controls

• Circuit Breakers

• Keep-alive Supplies

General Description

The SR086/SR087 are inductorless switching

regulators 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. The ICs feature an adjustable

main output voltage of 9V to 50V and an additional

fixed output of 3.3V for SR086 and 5V for SR087.

Efficiencies of around 55% may be realized for loads

up to 1W in 120 VAC applications and about 50%

efficiencies for loads up to 800 mW in 230 VAC

applications.

A logic-level enable input allows the SR086/SR087 to

be disabled—useful when they are employed as

keep-alive power supplies.

Package Type

Backside on the SOIC package is at ground potential and may be connected to

ground or left unconnected. See Table 2-1 for pin information.

8-lead SOIC

(with Heat Slug)

(Top view)

VIN

GND

VREG

GATE

VGD

VOUT

VFB

Heat Slug

WARNING

Galvanic isolation is not provided. Dangerous voltages are present when connected to the AC line. It is

the responsibility of the designer using the SR086/SR087 to ensure that adequate security measures are

in place to protect the end user from electrical shock.

The circuits shown in this data sheet are not guaranteed to meet surge and conducted EMI

requirements. The effectiveness of these circuits may vary with a particular application. The designer

must conduct tests to ascertain compliance with applicable standards and regulations.

Adjustable Offline Inductorless Switching Regulators

SR086/SR087

DS20005544A-page 2  2017 Microchip Technology Inc.

Functional Block Diagram

1.0kV

1.0A

275V

50A

90 to

270VAC

50/60Hz

RGD

1.1MΩ

STGD5NB120SZ

VOUT - 1

1.25V

RFB(HI) = RFB(LO)

3.3V

CREG

100nF

GND

VREG

VOUTVGDGATEVIN

1.25A

9.0 - 50VDC

SR086

FB(LO)

12.4kΩ

100nF

COUT

470μF

RPD

390kΩ COUT1

1.0μF

Upper circuitry

Lower circuitry

Level

Translator

1.25V

REG

13V

s





1.0kV

1.0A

275V

50A

90 to

270VAC

50/60Hz

RGD

1.1MΩ

STGD5NB120SZ

VOUT - 1

1.25V

RFB(HI) = RFB(LO)

5.0V

CREG

100nF

GND

VREG

VOUTVGDGATEVIN

1.25A

9.0 - 50VDC

SR087 RFB(LO)

12.4kΩ

CGD

100nF

COUT

470μF

RPD

390kΩ COUT 1

1.0μF

Upper circuitry

Lower circuitry

Level

Translator

1.25V

REG

13V

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	SR087

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