U6046B / U6047B

TELEFUNKEN Semiconductors

Rev. A2, 03-Feb-97

1 (11)

Rear Window Heating Timer

Description

The window heating timers are bipolar integrated

circuits. Due to time controlled functions, they reduce the

current consumptions of high loads i.e., heating resistors.

An ON-relay can be switched off after a preset delay time.

The relay time can be interrupted manually, whereas a

retrigger function is not provided.

Features

D Delay time range: 3.7 s to 20 h

D RC oscillator determines switching characteristics

D Relay driver with Z-diode

D Debounced input for toggle switch

D Two debounced inputs: ON and OFF

D Load-dump protection

D RF interference protected

D Protection according to ISO/TR7637-1 (VDE 0839)

D U6047B: Inputs switched to ground

Ordering Information

Extended Type Number

Package

Remarks

U6046B, U6047B

DIP8

U6046B–FP, U6047B–FP

SO8

Block Diagram

Stabilization

Power-on reset

Load-dump detection

Debouncing

Monoflop

Relay control

output

Oscillator

Frequency divider

ON

OFF

TOGGLE

GND

OSC

94 8747

6

7

8

3

4

5

1

2

510

W

47

mF

Figure 1. Block diagram with external circuit