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Ground-wire Breakage Protection
1. Description
The U6084B is a PWM-IC with bipolar technology 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 constant
brightness, the preselected duty cycle can be reduced automatically as a function of
the supply voltage.
PWM Power
Control with
Automatic
Duty-cycle
Reduction
U6084B
Figure 1-1.
Block Diagram with External Circuit
C
5
16
9
Short circuit
latch monitoring
5
RC oscillator
6
Charge 13
pump
PWM
Logic
3
Control input
Output
C
3
47 nF
14
11
Current monitoring
+ short circuit detection
12
R
sh
V
Batt
V
S
C
1
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C
2
Duty cycle
range
0-100%
Duty cycle
reduction
4
Voltage
monitoring
1
Enable/
disable
2
150
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R
3
Ground
.
Rev. 4677C鈥揂UTO鈥?9/05
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