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TJ4203GQ-X.X Datasheet(PDF) 8 Page - HTC Korea TAEJIN Technology Co. |
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TJ4203GQ-X.X Datasheet(HTML) 8 Page - HTC Korea TAEJIN Technology Co. |
8 / 10 page 300mA Ultra Low Dropout Linear Regulator TJ4203 Apr. 2011 – Rev.1.0 8/10 HTC where TJ is the junction temperature, TC is the case temperature, TA is the ambient temperature, PD is the total power dissipation of the device, θCA is the thermal resistance of case-to-ambient, θJC is the thermal resistance of junction-to-case, and θJA is the thermal resistance of junction to ambient. The total power dissipation of the device is given by: PD = PIN – POUT = (VIN X IIN)–(VOUT X IOUT) = (VIN X (IOUT+IGND)) – (VOUT X IOUT) = (VIN - VOUT) X IOUT + VIN X IGND where IGND is the operating ground current of the device which is specified at the Electrical Characteristics. The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the application, and the maximum allowable junction temperature (TJmax): TRmax = TJmax – TAmax The maximum allowable value for junction-to-ambient thermal resistance, θJA, can be calculated using the formula: θJA = TRmax / PD |
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