L9610 데이터 시트보기 (PDF) - STMicroelectronics

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L9610

PWM POWER MOS CONTROLLER

STMicroelectronics 

Figure 5 : Application Circuit.

L9610C - L9611C

The sensing resistor RS and timing capacitor Ct

should be dimensioned according to :

RS =

VSi

2Inom (@Vs=14 V)

Ct =

2 x limitation time

KT

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.

9/12

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