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TDA21201-S7 Datasheet(PDF) 11 Page - Infineon Technologies AG |
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TDA21201-S7 Datasheet(HTML) 11 Page - Infineon Technologies AG |
11 / 15 page Preliminary Data Sheet TDA21201 Page 11 Apr-29, 2002 Having the power dissipation Pd of the Integrated Switch, the required thermal resistance RthCA can be calculated. RthCA is the value of the heat sink attached to the TO-220 version of the Integrated Switch. RthCA is the “effective” thermal resistance (takes airflow etc. into account): Rthjc Pd TA Tj RthCA − − ≤ max _ Wherein: RthCA = Thermal resistance from the package’s metal backside (= lead frame) to ambient air that is required to operate the Integrated Switch under given load and environmental conditions without exceeding the maximum allowed junction temperature; in [°C/W] Tj_max = Maximum allowed junction temperature of the Integrated Switch; in [°C], use 110 °C for the SMD version of the Integrated Switch, use 125 °C for the TO-220 version of the Integrated Switch TA = The ambient temperature; in [°C], usually this is the maximum temperature of the surrounding air @ worst case, e.g. 55 °C Pd = The power loss generated in the Integrated Switch that needs to be dissipated through the heat sink à air (TO-220) or the PCB à air for thermal balance; in [W], use one of the two diagrams Pd vs. Iphase or Pd vs. f_sw to find the this value for your particular application Rthjc = Thermal resistance junction to case of the Integrated Switch; in [K/W], use ≤ 2 K/W (s. also pg. 3 and 4 “Thermal characteristic of the High side/Low side MOSFET” in this data sheet; the majority of the losses are generated within the MOSFETs, not in the driver) Efficiency of a DC/DC converter using the Integrated Switch TDA21201 The following measurements were performed on a 4-phase Evaluation Board. Phase 4 can be disabled so that the converter operates in a 3-phase mode. Boundary Conditions: Vcc = 12 V, Vo = 1.6 V, TDA21201 as SMD I 4-Phase Converter: Efficiency vs. Load current 65 70 75 80 85 90 95 0 20 40 60 80 Load Current [A] f_1 = 185 kHz f_2 = 305 kHz |
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