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ICE2A0565G Datasheet(PDF) 12 Page - Infineon Technologies AG |
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ICE2A0565G Datasheet(HTML) 12 Page - Infineon Technologies AG |
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12 / 37 page  Version 2.8 12 30 Aug 2011 CoolSET™-F2 Functional Description Figure 11 PWM Controlling 3.3 Soft-Start Figure 12 Soft-Start Phase The Soft-Start is realized by the internal pull-up resistor RSoft-Start and the external Capacitor CSoft-Start (see Figure 5). The Soft-Start voltage VSoftS is generated by charging the external capacitor CSoft-Start by the internal pull-up resistor RSoft-Start. The Soft-Start-Comparator compares the voltage at pin SoftS at the negative input with the ramp signal of the PWM-OP at the positive input. When Soft-Start voltage VSoftS is less than Feedback voltage VFB the Soft-Start-Comparator limits the pulse width by resetting the PWM-Latch (see Figure 12). In addition to Start-Up, Soft-Start is also activated at each restart attempt during Auto Restart. By means of the above mentioned CSoft-Start the Soft- Start can be defined by the user. The Soft-Start is finished when VSoftS exceeds 5.3V. At that time the Protection Unit is activated by Comparator C4 and senses the FB by Comparator C3 wether the voltage is below 4.8V which means that the voltage on the secondary side of the SMPS is settled. The internal Zener Diode at SoftS has a clamp voltage of 5.6V to prevent the internal circuit from saturation (see Figure 13). Figure 13 Activation of Protection Unit The Start-Up time TStart-Up within the converter output voltage VOUT is settled must be shorter than the Soft- Start Phase TSoft-Start (see Figure 14). By means of Soft-Start there is an effective minimization of current and voltage stresses on the integrated CoolMOS™, the clamp circuit and the output overshoot and prevents saturation of the transformer during Start-Up. x3.65 PWM OP Improved Current Mode PWM Comparator Isense Soft-Start Comparator 6.5V PWM-Latch 0.8V FB Optocoupler R FB t 5.3V V SoftS Gate Driver t T Soft-Start 5.6V 6.5V R FB 6.5V Power-Up Reset C4 5.3V C3 4.8V R Soft-Start FB R S Q Q Error-Latch R S Q Q PWM-Latch G2 Clock Gate Driver 5.6V SoftS CSoft Start – T Soft Start – RSoft Start – 1.69 ´ ------------------------------------- = |
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