Microchip SR087DB1 Handleiding

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Supertex inc.

Supertex inc.

www.supertex.com

SR087DB1

Doc.# DSDB-SR087DB1

A032014

Board Layout and Connection Diagram

Inductorless Switching Off-line

Power Supply Demoboard

Specications

Parameter Value

AC Input (VIN): 90 to 270VAC

45Hz to 65Hz

Output voltages:

VOUT (no load)

VREG

12.6V ± 8%1

5.0V ± 5%

Output current, max:

IREG

IOUT + IREG

120VAC

60mA

100mA

230VAC

60mA

60mA

Efciency, typ.2 (full load):52%44%

Standby power, typ. (no load):62mW 200mW

Introduction:

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 rectied 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 charges up on

the rising edge of a sine wave, reasonable efciencies can

be obtained without the use of magnetics.

Instructions on page 2 and 3 describe how the demoboard

may be modied to better suit applications that are not satis-

ed by the board as provided. For a full description of the

SR087, see the SR087 datasheet.

Notes:

1. Adjustable from 9.0V to 50V.

2. Referenced to V

OUT.

+

D1

Z1

F1 C2

R5

Q1

R2

R3

R4 C3

~ ~

R1

R7

C4

R6 C1

C5

R8

-

WARNING!!!

Do not connect earth-grounded loads

or test instruments. Doing so will short

the AC line, resulting in damage to the

instrument, load, and/or the SR087 circuit.

Uese floating instruments or high voltag

differential probes. Do not use a

transformer on the AC line.

WARNING!!!

No galvanic isolation.

Dangerous voltages are

present when connect to

the AC line.

VIN

90 - 270VAC

50/60Hz

VOUT

(12.6V)

VREG (5.0V)

ENABLE

GND

Terminal blocks J1 and J2 may be removed by pulling straight up.

J1

J2

Supertex SR087DB1

Warning! No galvanic isolation.

Dangerous voltages are present.

Do not connect grounded loads

or test equipment. Do not use

a transformer on the AC line.

VIN

EN

GND

VREG

VOUT

IC1

Product specificaties