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ICE2AS01 Fiches technique(PDF) 9 Page - Infineon Technologies AG |
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ICE2AS01 Fiches technique(HTML) 9 Page - Infineon Technologies AG |
9 / 24 page Version 2.0 9 1 Feb 2002 ICE2AS01/G ICE2BS01/G Functional Description Figure 8 PWM Controlling 3.3 Soft-Start Figure 9 Soft-Start Phase The Soft-Start is realized by the internal pullup resistor R Soft-Start and the external Capacitor C Soft-Start (see Figure 2). The Soft-Start voltage V SoftS is generated by charging the external capacitor C Soft-Start by the internal pullup resistor R Soft-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 V SoftS is less than Feedback voltage V FB the Soft-Start-Comparator limits the pulse width by reseting the PWM-Latch (see Figure 9). In addition to Start-Up, Soft-Start is also activated at each restart attempt during Auto Restart. By means of the above mentioned C Soft-Start the Soft-Start can be defined by the user. The Soft-Start is finished when V SoftS 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 with breaktrough voltage of 5.6V is to prevent the internal circuit from saturation (see Figure 10). Figure 10 Activation of Protection Unit The Start-Up time T Start-Up within the converter output voltage V OUT is settled must be shorter than the Soft- Start Phase T Soft-Start (see Figure 11). By means of Soft-Start there is an effective minimization of current and voltage stresses on the external Power Switch, the clamp circuit and the output overshoot and prevents saturation of the transformer during Start-Up. x3 .6 5 PW M O P Im proved Current M ode P W M C om para tor Is ense S o ft-S ta rt C o m p ara to r 6.5V PW M -L atch 0.8V FB O ptocoupler R FB t 5.3V V SoftS Ga te D rive r t T S oft-S tart 5.6V 6.5 V R FB 6.5V P o we r-Up R e s e t C4 5.3 V C3 4.8 V R S o ft-S ta rt FB R S Q Q Erro r-La tc h R S Q Q P W M -Latc h G2 Clo c k Ga te Driv e r 5.6V SoftS 69 , 1 × = − − − Start Soft Start Soft Start Soft R T C |
Numéro de pièce similaire - ICE2AS01 |
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Description similaire - ICE2AS01 |
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