KA3903 FAIRCHILD [Fairchild Semiconductor], KA3903 Datasheet - Page 11

• Manufacturer Part Number: KA3903
• Description: Power Window Motor Control IC
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

FAN8903(KA3903)
Power Supply
For the reasons of interference protection and surge immunity, all circuit should be provided with a RC circuit for a current
limitation in the event of overvoltage and for buffering in the event of voltage dips at Vref.
Suggested dimensioning; Rin=180 , Cin=47 F, as shown in the typical applications.
There ia a 18.6V zener diode between V
and GND.
CC
Load Dump Protection
The load dump protection withstands up to 70V (refer to the typical application-I) with a decay time.
In this case, the power dissipation of the FAN8903 takes please at three parts; V
, OUT1 and OUT2.
CC
But in the typical application-II, the supply voltage of the relay is limited the internal zener diode voltage.
The power dissipation of the output stage is not on count. So the FAN8903 can withstand up to 100V load dump with =
200ms.
1. REVERSE BATTERY VOLTAGE PROTECTION
In case of the reverse battery, the FAN8903 is modeled with a diode. Due to the external impedance at pin #16, the FAN8903
is protected against reverse battery voltage for one minute (or continuously).
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