L9610C datasheet(9/12 Pages) STMICROELECTRONICS

Part #	L9610C

Description	PWM POWER MOS CONTROLLER

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Figure 5 : Application Circuit.

The sensing resistor RS and timing capacitor Ct

should be dimensioned according to :

VSi

RS =

2Inom (@Vs=14 V)

2 x limitation time

Ct =

In normal conditions (VCC = 14 V, maximum bright-

ness) the voltage drop across the sense resistor

must be 50 mV. The current limiter intervenes

attwice the nominal current, Inom.

The timing capacitor Ct (Vct =3.5 V) must be chosen

so that the delay before intervention is twice the du-

ration of the current limitation at power-on.

The optimal value of the oscillator frequency, taking

tolerances into account, must be slightly higher than

the frequency at which lamp flicker is noticable (min

60 Hz).

The switching times are a compromise between

possible EMI and switching power losses. The rec-

ommended value for Cs is 47pF.

L9610C - L9611C

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L9610C Datasheet(PDF) 9 Page - STMicroelectronics