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PDF U6433B Data sheet ( Hoja de datos )
| Número de pieza | U6433B | |
| Descripción | Frequency Doubling Disabling | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Temperature and Voltage Compensated Frequency
• Warning Indication of Lamp Failure by Means of Frequency Doubling can be Disabled
• Voltage Dependence of the Car Indicator Lamps Compensated for Lamp Failure
• Relay Output with High Current Carrying Capacity and Low Saturation Voltage
• Minimum Lamp Load for Flasher Operation ≥ 1W
• Load-dump Protection
• Very Low Susceptibility to EMI
• Protection According to ISO/TR 7637/1 Level 4
1. Description
The design of the U6433B is similar to that of U6043B, both devices have the same
excellent EMC (Electro Magnetic Capability) and protection features. The U6433B
includes an additional 8-mV comparator and a logical connection with the frequency
doubling stage. This combination can be used for a hazard switch which bypasses the
external shunt resistor to disable the frequency doubling. This feature is especially
important with respect to the US automotive industry. During direction mode the
U6433B works like other flashers, that is, frequency doubling in the case of lamp
outage.www.DataSheet4U.com
Flasher, 18-mΩ
Shunt,
Frequency
Doubling
Disabling
U6433B
Rev. 4810B–AUTO–10/05
1 page  
U6433B
3.6.2
Control Signal Threshold 2 (8-mV Comparator K4)
A voltage drop between 49 mV to 8 mV at R3 shunt resistor lets the flasher work in frequency
doubling mode.
If the voltage drop decreases to a value below VR3MAX = 8 mV, frequency doubling is disabled.
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 VS to pin 6 is lower than the resistance to pin 2.
Flasher operation starts with a lamp load of PL ≥ 1W.
3.7 Pin 8, Start Input
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 kΩ, 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.
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.
Parameters
Symbol
Value
Unit
Supply voltage, pins 2 and 6
Surge forward current
tp = 0.1 ms, pins 2 and 6
tp = 300 ms, pins 2 and 6
tp = 300 ms, pin 8
Output current, pin 3
Power dissipation
Tamb = 95°C, SO8
Tamb = 60°C, SO8
Junction temperature
Ambient temperature range
Storage temperature range
VS
IFSM
IO
Ptot
Tj
Tamb
Tstg
18
1.5
1.0
30.0
0.3
340
560
150
–40 to +105
–55 to +150
V
A
A
mA
A
mW
mW
°C
°C
°C
5. Thermal Resistance
Parameters
Junction ambient SO8
Symbol
RthJA
Value
160
Unit
K/W
4810B–AUTO–10/05
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet U6433B.PDF ] | |
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