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Pulse-width Modulation up to 2 kHz Clock Frequency
Protection against Short-circuit, Load-dump Overvoltage and Reverse V
S
Duty-cycle 0 to 100% Continuously
Output Stage for Power MOSFET
Interference and Damage Protection According to VDE 0839 and ISO/TR 7637/1
Charge-pump Noise Suppressed
Ground-wire Breakage Protection
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.
Figure 1.
Block Diagram with External Circuit
C
5
16
9
Short circuit
latch monitoring
5
RC oscillator
6
C
1
PWM
Charge 13
pump
Logic
3
Control input
Output
C
3
47 nF
14
11
Current monitoring
+ short circuit detection
12
R
sh
V
Batt
PWM Power
Control with
Automatic
Duty-cycle
Reduction
U6084B
V
S
47 k鈩?/div>
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. 4677B鈥揂UTO鈥?2/04
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