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U429B-FP

Driver For IR Transmitter Diodes (Current Sink)

Technology:

Bipolar

Features

D

D

D

D

D

Constant current for IR signal 320 mA

Undervoltage control with indicator driver

Constant current output for control LED 100 mA

Current stabilisation starts at V

CE

= 1 V

Control voltage V

4

= 2 to 13.2 V

Package:

SO8

D

Minimum driver current I

4

= 0.4 mA

D

Additional switching transistor I

C

= 20 mA

Figure 1. Block diagram

Pin Description

Pin

1

2

3

4

Symbol

Ground

V

O

V

I

V

I

Function

Negative supply terminal

Switching output

(standby/ operation)

Control input

(standby/ operation)

Signal input to drive the current

source

Pin

5

6

7

8

Symbol

V

S1

I

O

I

O

V

S2

Function

Positive supply voltage terminal

Undervoltage indicator output

(battery control)

IR diode output signal

Supply voltage for the control

stages of constant current outputs

TELEFUNKEN Semiconductors

Rev. A1, 27-Feb-96

1 (4)

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