ILA1185A

unless other noted.)

Characteristics

Symbol

Min

Typ

Мax

Unit

Positive Feedback

Programming pin voltage related to Pin 1

Transfer Function Gain

Pin 8 Output Internal Impedance

A

A

-

1.0

-

-

-

1.25

75

36

120

-

1.5

-

-

-

V

k

Ω

Trigger Pulse Generator

Output Pulse Width

Output Pulse Repetition Period

t

60

-

-

-

-40

-

-

55

420

-

80

4.0

-

-4

+40

mA

µA

µs

µs

µA

PIN FUNCTION DESCRIPTION

Pin

No.

Function

Description

1

This pin is the negative supply for the chip and clamped at -8.6 V by an internal zener.

2

Gate Trigger Pulse

This pin supplies - 1.0V triac trigger pulse at twice the line frequency.

3

NC

Not connected.

4

Ramp Generator

The value of the capacitor at this pin determines the slope of the ramp.

5

NC

Not connected.

6

Current Sense

This pin senses if the triac is on, and if so, will disable the gate trigger pulse.

7

Voltage Sense

The internal timing of the chip is set by the frequency of the voltage at this pin

8

Integration Capacitor

This pin is the output of the feedback and the variation in voltage is averaged out by

the capacitor.

9

Feedback Input

The change in load current is detected by the change in voltage across R9.

10

Current Program

The bias current for the circuit is determined by the resistor value at this pin.

11

NC

Not connected.

12

Phase Angle Set

The voltage at this pin sets the no-toad firing angle.

13

Soft-Start

14

Ground

3