IRS2530DPBF Просмотр технического описания (PDF) - International Rectifier

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IRS2530DPBF

DIM8™ DIMMING BALLAST CONTROL IC

International Rectifier 

VVCO

4.0V

VVCOFLT+

IRS2530D(S)

0.85V

Freq

fmax

Preheat/Ignition Mode

Dim Mode

fmin

VLAMP

Lamp Ignites

VDIM

DC dim reference

AC lamp current

Figure 3, Preheat/Ignition/Dim Mode timing diagram.

The resonant output stage transitions to a series-L, parallel-RC circuit with the Q-value and operating point

determined by the user dim level (Figure 4). If the lamp does not ignite, the voltage on pin VCO continues to

increase and the frequency continues to decrease until the VCO voltage exceeds VVCOFLT+ (4.0V, typical) and

the IC enters Fault Mode and shuts down. The minimum frequency should be set below the high-Q

resonance frequency of the ballast output stage to ensure that the frequency ramps through resonance for

lamp ignition (Figure 4). The desired preheat time can be set by adjusting the slope of the VCO ramp with

the external capacitor, CPH.

www.irf.com

© 2008 International Rectifier

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