u6084b ATMEL Corporation, u6084b Datasheet - Page 6

• Manufacturer Part Number: u6084b
• Description: U6084b Pwm Power Control With Automatic Duty-cycle Reduction
• Manufacturer: ATMEL Corporation

3.11
3.11.1
3.11.2
6
Pin 16 – Supply Voltage, V
U6084B
Undervoltage Detection
Overvoltage Detection
In the event of voltages of approximately V
latch for short-circuit detection is reset.
A hysteresis ensures that the FET is switched on again at approximately V
• Stage 1
• Stage 2
– If overvoltages of V
– If V
and switched on again at V
The gate of the external transistor remains at the potential of the IC ground, thus
producing voltage sharing between the FET and lamps in the event of overvoltage
pulses (for example, load dump). The short-circuit protection is not in operation. At
V
Batt
Batt
< 23V, the overvoltage detection stage 2 is switched off.
> 28.5V (typically), the voltage limitation of the IC is reduced from 26V to 20V.
s
or V
Batt
Batt
> 20V (typically) occur, the external transistor is switched off
Batt
< 18.5V (hysteresis).
Batt
< 5.0V, the external FET is switched off and the
Batt
5.4V.
4677C–AUTO–09/05