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TC1070VCT Folha de dados(PDF) 5 Page - TelCom Semiconductor, Inc |
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TC1070VCT Folha de dados(HTML) 5 Page - TelCom Semiconductor, Inc |
5 / 12 page TC1070 5 PRELIMINARY INFORMATION TC1070-01 6/13/97 50mA ADJUSTABLE CMOS LDO WITH SHUTDOWN Equation 2 can be used in conjunction with Equation 3 to ensure regulator thermal operation is within limits. For example: Given: VIN MAX = 3.0V ±10% VOUT MIN = 2.7V ±0.5V ILOAD = 40mA TAMAX = 55°C Find: 1. Actual power dissipation 2. Maximum allowable dissipation Actual power dissipation: PD ≈ (VINMAX – VOUTMIN)ILOADMAX = [(3.0 x 1.05) – (2.7 x .995)]40 x 10–3 = 18.5mW Maximum allowable power dissipation: PD MAX = (TJMAX – TAMAX) θJA = (125 – 55) 220 = 318mW In this example, the TC1070 dissipates a maximum of only 60mW; far below the allowable limit of 318mW. In a similar manner, Equation 2 and Equation 3 can be used to calculate maximum current and/or input voltage limits. Layout Considerations The primary path of heat conduction out of the package is via the package leads. Therefore, layouts having a ground plane, wide traces at the pads, and wide power supply bus lines combine to lower θJA and therefore increase the maximum allowable power dissipation limit. |
Nº de peça semelhante - TC1070VCT |
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Descrição semelhante - TC1070VCT |
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