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TDA21201 Datasheet(PDF) 5 Page - Infineon Technologies AG |
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TDA21201 Datasheet(HTML) 5 Page - Infineon Technologies AG |
5 / 15 page Preliminary Data Sheet TDA21201 Page 5 Apr-29, 2002 Designing a 12 V to sub-3.3 V converter using the TDA21201 General info To design a multi-phase converter with a 12 V input simply use in each phase just one TDA21201 instead of using a MOSFET driver, a high side MOSFET, bootstrap components, and one or more low side MOSFETs. The entire converter is completed by the input filter, the output filter and a multi-phase PWM IC. Input compatibility to standard PWM controllers / shut-down mode The Integrated Switch TDA21201 has a high impedance input pin ‘IN’ to be connected to PWM controller outputs ‘PWM1’, ‘PWM2’ etc. It sinks or sources only a fraction of a mA from the controller’s output. The TDA21201 is compatible to standard controller and driver signals in terms of the signal level (5 V TTL) and in terms of the ‘Low’/’High’ relationship (’Low’ turns the low side MOSFET on, ‘High` turns the High side MOSFET on). The TDA21201 can be shut down (the high side MOSFET and the low side MOSFET is turned off) by applying an input signal VIN = 1.2 ... 1.6 V for more than 1.5 µs typical. This way the TDA21201 reduces the power dissipation by saving the gate charges of both the high side and the low side MOSFET during no load conditions. The shutdown state is terminated when VIN moves into the ‘Low’ or ‘High’ threshold. Typical Application: 12 V à 1.x V N-Phase Converter using the TDA21201 PWM IC PWM 1 PWM 2 PWM N 12 V FET Driver 1 FET Driver N L1 LN 1...2 V C |
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