Microchip SR087DB1 Manual

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Side 1/4

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

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.

F1 C2

R4 C3

~ ~

R6 C1

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.

U ese 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.

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

GND

VREG

VOUT

IC1

SR087DB1

Supertex inc.

www.supertex.com

Doc.# DSDB-SR087DB1

A032014

Schematic

VGDVIN GATE VOUT

GND

VREG

VOUT

12.6VDC

VIN

90 to 270VAC

50/60Hz

100nF

1.0µF

20kΩ

1.0kV, 1.0A

275V

50A

1.25A

STGD5NB120SZ

SR087

optional EMI

supressor

GND

do not

connect to

earth

ground!

VIN

200kΩ

200kΩ R3

510kΩ

0Ω

not installed

470µF

100nF

VREG

5.0VDC

12.4kΩ

113kΩ

VIN - Connect to a 120/230VAC line. The AC input is pro-

tected by a 275V metal oxide varistor (MOV) and a 1.25A

slow-blow fuse.

Do not use a transformer on the input line. The high induc-

tance creates inductive kickback, which can overload the

MOV.

The SR087DB1 will not operate from uninterruptible power

supplies having a square wave output. This type of output is

usually referred to as “modied sine wave”.

GND - Circuit common. Since galvanic isolation is not pro-

vided, connecting this point to an earth-grounded instrument,

(such as an oscilloscope), will short the AC line, resulting in

circuit and/or instrument damage.

Also note that GND may be at a higher potential with respect

to earth ground, even if the AC is switched off. Use cau-

tion!

VOUT - The main output. No-load output voltage is 12.6V.

Because the VOUT storage capacitor (C3) recharges twice

per input cycle, this output will have a certain amount of

100/120Hz ripple, depending upon the load. The SR087

regulates the peak output voltage, not the average, thus the

average voltage will decrease under load.

VOUT is adjustable from 9.0 to 50V. See the modications

section on page 3. A source-only external voltage may be

applied to this output.

Do not connect earth-grounded loads or instruments!

VREG - The regulated output, 5.0V nominal output voltage.

VREG

is the output of a linear regulator internal to the SR087,

which in turn is supplied by VOUT. Thus any load on VREG is ef-

fectively a load on VOUT

. VREG requires at least 4.0V of head-

room to operate. Being a linear regulator, the SR087 will dis-

sipate power as IREG

is increased, up to 460mW at 60mA.

Enable - A logic low (<0.2V) enables Q 1

switching. A logic

high (>0.75 • VREG) disables Q1, shutting down VOUT and thus

VREG

. However, if an external voltage is applied to VOUT when

disabled, VREG will continue to function and provide a 5.0V

output.

The input has 20kΩ pull-down. If unused, Enable should be

left unconnected or connected to ground.

Connections:

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	SR087DB1

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