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ICE3GS03LJG Datasheet(PDF) 11 Page - Infineon Technologies AG |
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ICE3GS03LJG Datasheet(HTML) 11 Page - Infineon Technologies AG |
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11 / 25 page  F3 PWM controller ICE3GS03LJG Functional Description Version 2.0 11 1 Nov 2010 decrease gradually and the duty ratio of the gate drive increases gradually. The Soft Start will be finished in 10ms (tSoft-Start) after the IC is switched on. At the end of the Soft Start period, the current sink is switched off. Figure 12 Gate drive signal under Soft-Start Phase Within the soft start period, the duty cycle is increasing from zero to maximum gradually (see Figure 12). Figure 13 Start Up Phase In addition to Start-Up, Soft-Start is also activated at each restart attempt during Auto Restart. The Start-Up time tStart-Up before the converter output voltage VOUT is settled, must be shorter than the Soft- Start Phase tSoft-Start (see Figure 13). By means of Soft-Start there is an effective minimization of current and voltage stresses on the external power MOSFET, the clamp circuit and the output overshoot and it helps to prevent saturation of the transformer during Start-Up. 3.5 PWM Section Figure 14 PWM Section Block 3.5.1 Oscillator The oscillator generates a fixed frequency of 130kHz with frequency jittering of ±4% (which is ±5.2kHz) at a jittering period of 4ms. A capacitor, a current source and a current sink which determine the frequency are integrated. The charging and discharging current of the implemented oscillator capacitor are internally trimmed, in order to achieve a very accurate switching frequency. The ratio of controlled charge to discharge current is adjusted to reach a maximum duty cycle limitation of Dmax=0.75. Once the Soft Start period is over and when the IC goes into normal operating mode, the switching frequency of the clock is varied by the control signal from the Soft t VSOFTS32 VSoftS Gate Driver t tSoft-Start t t VSoftS t VSOFTS32 4.2V tSoft-Start VOUT VFB VOUT tStart-Up Oscillator Duty Cycle max Gate Driver 0.75 Clock & G9 1 G8 PWM Section FF1 R S Q Soft Start Comparator PWM Comparator Current Limiting Frequency Jitter Soft Start Block Gate |
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