U6433B_05 ATMEL [ATMEL Corporation], U6433B_05 Datasheet - Page 5

• Manufacturer Part Number: U6433B_05
• Description: Flasher, 18-m Shunt, Frequency Doubling Disabling
• Manufacturer: ATMEL [ATMEL Corporation]

3.6.2
3.7
4. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point pin 1.
5. Thermal Resistance
4810B–AUTO–10/05
Parameters
Supply voltage, pins 2 and 6
Surge forward current
t
t
t
Output current, pin 3
Power dissipation
T
T
Junction temperature
Ambient temperature range
Storage temperature range
Parameters
Junction ambient SO8
p
p
p
amb
amb
= 0.1 ms, pins 2 and 6
= 300 ms, pins 2 and 6
= 300 ms, pin 8
= 95°C, SO8
= 60°C, SO8
Pin 8, Start Input
Control Signal Threshold 2 (8-mV Comparator K4)
A voltage drop between 49 mV to 8 mV at R
doubling mode.
If the voltage drop decreases to a value below V
This can be achieved either with a switch which bypasses the shunt resistor (for example, a spe-
cial hazard warning switch) or with a small lamp load.
The arrangement of the supply connections to pins 2 and 6 must ensure that, on the connection
PCB, the layer resistance from V
Flasher operation starts with a lamp load of P
Start condition for flashing: the voltage at pin 8 has to be below the K3 threshold (flasher switch
closed).
Humidity and dirt may decrease the resistance between 49a and GND. If this leakage resistance
is > 5 k , the IC is still kept in its off condition. In this case the voltage at pin 8 is between the
thresholds of comparators K2 and K3.
During the bright phase the voltage at pin 8 is above the K2 threshold; during the dark phase it is
below the K3 threshold.
For proper start conditions, a minimum lamp wattage of 1W is required.
Symbol
Symbol
R
T
I
T
P
FSM
V
I
amb
T
thJA
stg
O
tot
S
j
S
to pin 6 is lower than the resistance to pin 2.
L
3
shunt resistor lets the flasher work in frequency
R3MAX
1W.
–40 to +105
–55 to +150
Value
Value
30.0
= 8 mV, frequency doubling is disabled.
340
560
150
160
1.5
1.0
0.3
18
U6433B
Unit
Unit
K/W
mW
mW
mA
°C
°C
°C
V
A
A
A
5