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ICE3BR4765JZ Datasheet(PDF) 11 Page - Infineon Technologies AG |
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ICE3BR4765JZ Datasheet(HTML) 11 Page - Infineon Technologies AG |
11 / 32 page ICE3BR4765JZ Functional Description Version 2.1 11 30 Aug 2011 3.4 Startup Phase Figure 9 Soft Start In the Startup Phase, the IC provides a Soft Start period to control the primary current by means of a duty cycle limitation. The Soft Start function is a built-in function and it is controlled by an internal counter. . Figure 10 Soft Start Phase When the VVCC exceeds the on-threshold voltage, the IC starts the Soft Start mode (see Figure 10). The function is realized by an internal Soft Start resistor, an current sink and a counter. And the amplitude of the current sink is controlled by the counter (see Figure 11). Figure 11 Soft Start Circuit After the IC is switched on, the VSFOFTS voltage is controlled such that the voltage is increased step- wisely (32 steps) with the increase of the counts. The Soft Start counter would send a signal to the current sink control in every 600us such that the current sink decrease gradually and the duty ratio of the gate drive increases gradually. The Soft Start will be finished in 20ms (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 S o ft - S ta r t C o m p a r a to r S o ft S ta r t & G 7 C 7 G a te D r iv e r 0 .6 7 V x 3 .3 P W M O P C S S o ft S ta r t c o u n te r S o ft S ta r t S o ftS V SoftS V SoftS2 V SoftS1 5V R SoftS Soft Start Counter I 2I 4I SoftS 8I 32I t VSOFTS32 VSoftS Gate Driver t TSoft-Start |
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