SR087DB1 Supertex, SR087DB1 Datasheet

SR087DB1

Manufacturer Part Number

SR087DB1

Description

Power Management IC Development Tools ADJUSTABLE OFF-LINE INDUCTORLESS SWITCHING REGULATOR DEMOBOARD

Manufacturer

Supertex

Type

AC/DC Convertersr

Datasheet

1.SR087DB1.pdf (4 pages)

Specifications of SR087DB1

Product

Power Management Modules

Tool Is For Evaluation Of

SR087

Input Voltage

90 V to 270 V

Output Voltage

5 V, 12.6 V

Factory Pack Quantity

Current page: 1 of 4
Download datasheet (317Kb)

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 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 charges up on

the rising edge of a sine wave, reasonable efﬁciencies can

be obtained without the use of magnetics.

Instructions on page 2 and 3 describe how the demoboard

may be modiﬁed to better suit applications that are not satis-

ﬁed by the board as provided. For a full description of the

SR087, see the SR087 datasheet.

Board Layout and Connection Diagram

Connections:

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 “modiﬁed sine wave”.

90 - 270VAC

instrument, load, and/or the SR087 circuit.

Use floating instruments or high voltage

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

the AC line, resulting in damage to the

or test instruments. Doing so will short

50/60Hz

Do not connect earth-grounded loads

differential probes. Do not use a

Supertex inc.

transformer on the AC line.

WARNING!!!

Inductorless Switching Off-line

●

Power Supply Demoboard

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.

1235 Bordeaux Drive, Sunnyvale, CA 94089

~ ~

Notes:

GND -

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.

tion!

Speciﬁcations

Parameter

AC Input (V

Output voltages:

Output current, max:

Efﬁciency, typ.

Standby power, typ. (no load):

1. Adjustable from 9.0V to 50V.

2. Referenced to V

REG

OUT

REG

+ I

IC1

(no load)

Circuit common. Since galvanic isolation is not pro-

REG

●

Tel: 408-222-8888

(full load):

OUT

GND

OUT

REG

●

www.supertex.com

WARNING!!!

No galvanic isolation.

Dangerous voltages are

present when connect to

the AC line.

120VAC

100mA

62mW

60mA

52%

SR087DB1

90 to 270VAC

45Hz to 65Hz

ENABLE

GND

12.6V ± 8%

OUT

REG

5.0V ± 5%

230VAC

200mW

(12.6V)

Use cau-

(5.0V)

60mA

44%

Value

Related parts for SR087DB1

SR087DB1 Summary of contents

Page 1

... Inductorless Switching Off-line 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 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 ...

Page 2

... GATE VIN IC1 EN SR086 20kΩ GND 3 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 2 SR087DB1 A logic low (<0.2V) enables Q switching. A logic 1 ) disables Q , shutting down V REG 1 will continue to function and provide a 5.0V REG 1.0µF 470µ optional EMI ...

Page 3

... For 120VAC-only applications they may be omitted (replaced with shorts), with R Conducted EMI As supplied, the SR087DB1 meets 47CFR Part 15 Class B and CISPR 14-1 requirements for conducted emissions at EQ. 1 combined load currents (I higher load currents network (R before the IGBT gate to slow down the falling edge ...

Page 4

... Supertex inc. 4 SR087DB1 Manufacturer’s Part Package Manufacturer 5x20mm any 14mm any - any 1206 any 1206 any 0805 any 0805 any 0805 ...

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