OM5428 datasheet(4/16 Pages) ETC1

Part #	OM5428

Description	General purpose triggering circuit

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4 / 16 page

2002 Nov 08

4

Integrated Electronic Solutions, Hendon, South Australia

Data Sheet

General purpose triggering circuit

OM5428

5

PINNING INFORMATION

5.1

Pinning layout

5.2

Pin description

OM5428

1

2

3

4

5

6

7

89

10

11

12

13

14

15

16

PW

XOUT

DIFFEN

QC+

QC

-

IC

-

IC+

SDIS

FLY

SAW

TRIG

RMNS

AMPIN

V

EE

XDIS

CC

Fig.1 Pin configuration

SYMBOL

DESCRIPTION

PW

1

pulse width control input

XOUT

2

zero-crossing detector output

DIFFEN

3

difference amplifier enable output

QC+

4

comparator non-inverting output

IC+

5

comparator non-inverting input

IC

−

6

comparator inverting input

QC

−

7

comparator inverting output

SDIS

8

triac gate sense disable input

AMPIN

9

output stage input

TRIG

10

output stage output

VEE

11

negative supply

VCC

12

positive supply

RMNS

13

external power resistor

SAW

14

sawtooth generator trigger input

FLY

15

sawtooth generator output

XDIS

16

zero crossing detector disable input

6

BLOCK DIAGRAM

OM5428

11

13

16

1

12

2

7

3

SUPPLY

ZERO-

CROSSING

DETECTOR

zero-crossing

detector output

enable input

pulse width

control input

negative

supply

external mains

resistor (Rs)

supply

common

56

14

8

9

10

15

4

comparator non-

inverting output

comparator

inverting input

comparator non-

inverting input

comparator

inverting output

DIFFERENCE

AMPLIFIER

SAWTOOTH

GENERATOR

OUTPUT

AMPLIFIER

sawtooth

generator

output

output stage

output

output stage

input

sawtooth

generator

input

gate sense

inhibiting input

external

resistor

XDIS

QC

-

QC+

FLY

VCC

RMNS

VEE

PW

XOUT

DIFFEN

IC+

IC

-

SAW

SDIS

AMPIN

TRIG

REGULATOR

v

GATE

SENSE

RESET

pull down on

pin IC-

pull up on

pin IC+

output

amplifier

inhibit

gate

sense

ready from

regulator

cc

pull up

on pin

SAW

output

amplifier

reset

(Rz)

Fig.2 Block diagram of the OM5428

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