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TDA21201-P7 数据表(PDF) 7 Page - Infineon Technologies AG |
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TDA21201-P7 数据表(HTML) 7 Page - Infineon Technologies AG |
7 / 15 page Preliminary Data Sheet TDA21201 Page 7 Apr-29, 2002 being fully On at a VCC level slightly greater than the threshold. Bootstrapping Turning on and off the High side MOSFET is done internally by the Driver. The TDA21201 does not require any external bootstrap components such as a capacitor or diode. Just apply GND, Vcc = 12 V, and the PWM signal of the Controller to it and the Integrated Switch will operate. Input filter / Output filter / Converter Stability The Integrated Switch TDA21201 is a new solution to implement the power semiconductor components in a DC/DC converter. It offers many advantages to the user. However, the basic behavior with respect to the voltages, the currents and the timing remains unchanged. Therefore, any of the rules and procedures applied to design DC/DC converters using discrete MOSFETs and Drivers apply in the same way to converters using the Integrated Switch – except the worries regarding dead time control, lowest impedance in the AC loop, elevated driver temperatures etc. Current sense Any of the commonly used current sense techniques are supported by the Integrated Switch. For Low side sensing measure the voltage drop across the GND pins and the OUT pin (or the tab when using the SMD version) during the Low side switch’s On-time (Vin = Low). The High side MOSFET is sensed across the Vcc and the OUT pin (or the tab when using the SMD version) of the Integrated Switch during its On-time (Vin = High). Inductor sensing is implemented outside of the integrated switch the usual way. Resistor sensing using a separate resistor in the Input capacitor à High side MOSFET (Vcc pin) path is possible but not recommended. This current sense approach introduces ample stray inductance in the AC current loop (+terminal of the input capacitor à High side MOSFET à Low side MOSFET à GND à -terminal of the input capacitor). This results in a very noisy Vcc line especially during the switching period and a non-optimized switching behavior of the Integrated Switch. This in turn, increases the switching losses and the device temperature and lowers the efficiency. Output current scalability The converter output current can be chosen in a wide range by selecting the appropriate number of phases. At a given number of phases the current per phase (= current per TDA21201) and in turn the overall converter output current is set by application requirements, e.g. the switching frequency, and by environmental conditions, e.g. ambient temperature and the thermal resistance of the TDA21201 to ambient. As a reference, one TDA21201 generates roughly 3.2 W @ 15 A RMS and 250 kHz (VCC = 12 V, VO = 1.6 V). This amount of loss can be dissipated by the SMD version of the Integrated Switch on a regular motherboard using proper thermal design techniques. Greater phase currents result in higher losses; and higher switching |
类似零件编号 - TDA21201-P7 |
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类似说明 - TDA21201-P7 |
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