Datenblatt-Suchmaschine für elektronische Bauteile |
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TDA21201-S7 Datenblatt(PDF) 10 Page - Infineon Technologies AG |
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TDA21201-S7 Datenblatt(HTML) 10 Page - Infineon Technologies AG |
10 / 15 page Preliminary Data Sheet TDA21201 Page 10 Apr-29, 2002 driver or the MOSFETs, the zener diode becomes conducting and reduces the discharge speed of the High Side MOSFET´s gate within nanoseconds. This will reduce slightly the turn-off slew rate of the High Side MOSFET´s current (= di/dt). As a result the over voltage will be limited. Power loss in the Integrated Switch TDA21201 / Heat sink estimation The power loss in the Integrated Switch depends mainly on the current and the switching frequency. Other conditions that impact the power loss are increased junction temperature and the layout (e.g. very tight coupling of the input capacitor to the VCC and GND pins to reduce the PCB trace inductance). Using the above two diagrams the power loss (= the required power dissipation Pd for thermally stable operation) can be estimated based on a required phase current Iphase (= current in the Integrated Switch) an based on the switching frequency per phase f_sw (= frequency of the Integrated Switch in each phase). 1 2 3 4 5 6 100 150 200 250 300 350 400 450 f_sw / phase [kHz] Iphase =12 A Iphase =18 A 1 2 3 4 5 6 10 15 20 25 Iphase [A] f_sw = 100 kHz f_sw = 150 kHz f_sw = 200 kHz f_sw = 250 kHz f_sw = 300 kHz |
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