U6083B_05 ATMEL [ATMEL Corporation], U6083B_05 Datasheet - Page 7

• Manufacturer Part Number: U6083B_05
• Description: PWM Power Control IC with Interference Suppression
• Manufacturer: ATMEL [ATMEL Corporation]

3.6
3.7
3.7.1
4770B–AUTO–09/05
Interference Suppression
Pins 5 and Pin 6, Short-circuit Protection and Current Sensing
Short-circuit Detection and Time Delay, t
Figure 3-1.
The lamp current is monitored by means of an external shunt resistor. If the lamp current
exceeds the threshold for the short-circuit detection circuit (V
switched over to 100% and the capacitor C
external FET again is switched off after the cut-off threshold (V
FET again is possible after a power-on reset only. The current source, I
capacitor C
The time delay, t
t
With C
t
t
d
d
d
• “On-board” radio reception according to VDE 0879 part 3/4.81
• Test conditions referring to
• Application circuit according to
• Load: nine 4W lamps in parallel
• Duty cycle = 18%
• V
• f
= C
= 100 nF
= 104 ms
Osc
Batt
5
5
= 100 Hz
= 12V
= 100 nF and V
V
T5
5
is not charged by parasitic currents.
/(I
10.4V/(13 µA – 3 µA)
Voltage Spectrum of On-board Radio Reception
ch
d
– I
, is calculated as follows:
dis
)
T5
= 10.4V, I
d
Figure 3-1
Figure 1-1 on page 2
ch
=13 µA, I
5
is charged by a current source of I
dis
= 3 µA, the time delay is as follows:
or
Figure 7-1 on page 11
T5
T2
) is reached. Switching on the
90 mV), the duty cycle is
dis
, ensures that the
U6083B
ch
– I
dis
. The
7