U6084B
PWM Power Control with Automatic Duty Cycle Reduction
Description
The U6084B is a bipolar technology PWM-IC designed
for the control of an N-channel power MOSFET used as
a high-side switch. The IC is ideal for use in the brightness
control (dimming) of lamps such as, in dashboard
applications. For a constant brightness the preselected
duty cycle can be reduced automatically as a function of
the supply voltage.
Features
D
Pulse width modulation up to 2 kHz clock frequency
D
Protection against short circuit, load-dump
overvoltage and reverse V
S
D
Interference and damage protection according to
VDE 0839 and ISO/TR 7637/1.
D
Duty cycle 0 to 100 % continuously
D
Output stage for power MOSFET
D
Charge pump noise suppressed
D
Ground wire breakage protection
Ordering Information
Extended Type Number
U6084B–FP
Package
SO16
Remarks
Block Diagram
C
5
V
S
16
9
Short circuit
latch monitoring
5
6
C
1
47 k
W
3
C
2
Control input
RC oscillator
PWM
Logic
Output
14
Charge
pump
13
C
3
47 nF
11
Current monitoring
+ short circuit detection
12
R
sh
V
Batt
Duty cycle
range
0–100%
Duty cycle
reduction
4
C
6
Voltage
monitoring
1
Enable/
disable
2
95 9751
150
W
R
3
Ground
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A1, 14-Feb-97
1 (8)
TEMIC [ TEMIC SEMICONDUCTORS ]
