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TSM007 Datasheet(PDF) 6 Page - STMicroelectronics |
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TSM007 Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 12 page  TSM007 Functional Description 6/12 Soft start A capacitor from the SS pin to GND provides the soft start function. The capacitor starts to charge when VIN reaches the UVLO threshold and Vref is good.The soft start block enables the IC to start with a progessive PWM duty cycle. The soft start period is set by the external capacitor Css. The soft start comparator drives the output driver low when the SS pin voltage is greater than the CT pin voltage minus one VF voltage.. Tss = Cssx(Vthct-VF)/Iiss Let’s assume Tss = 50ms ==> Css = TssxIiss/(Vthct-VF) ==> Css = 210nF Brown out A voltage proportionnal to the Bulk capacitor voltage is applied to the BRNOUT pin. When this pin signal is less than 2.5V, the IC is disabled: SS and CT pins go low, Vref is disabled and the IC goes to standby mode. All bias currents are switched off. The 2.5V voltage at the negative input of comparator Comp_Brown out is still active. When Brown out voltage goes higher than 2.5V, Vref is enabled again. A startup period is started, and then a soft start occurs.. Let’s assume BRNOUT acts for Vfiltered = 200V R2 = 15K Ω R1 = R2(Vfiltered - UVLO) / UVLO When BRNOUT is bellow 2.5V IR2 = Vfiltered(R1+R2) When BRNOUT is above 2.5V IR2 = Ibr + Vfiltered(R1+R2) BRNOUT = R2x(Ibr + Vfiltered(R1+R2)) R1 = 1185K Ω R2 = 167µA When BRNOUT is above 2.5V IR2 = 237µA BRNOUT = 3.55V Vref Idss 4mA Iiss 10µA Css SS Comp_SS VF CT CT Comp_osc 1.4V_3.0V Out Out R S Q !Q Cs_latch SS VCT-VF Tss = Soft start period Out 2.4V 0.8V Iiss=10µA Iiss Vref 1mA 400µA CT CT Comp_osc 1.4V_3.0V Out Out Vcc UVLO Vref Vref_Status R S Q !Q Startup Latch Comp_brown out Ibr = 50µA Vin 2.50V Brown out R1 R2 filtered Ibr Brown out 2.5V Ibr=50µA |
Similar Part No. - TSM007 |
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Similar Description - TSM007 |
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