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TC1189 Datasheet(PDF) 8 Page - Microchip Technology |
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TC1189 Datasheet(HTML) 8 Page - Microchip Technology |
8 / 18 page TC1188/TC1189 DS21364C-page 8 2002-2012 Microchip Technology Inc. EXAMPLE 3-1: The previously defined power dissipation equations can be used to ensure that the regulator thermal operation is within limits. Given: VIN(MAX) = 3.0V +10% VOUT(MAX) = 2.7V - 2.5% ILOAD(MAX) = 40 MA TJ(MAX) = 125°C TA(MAX) = 55°C Find: 1. Actual power dissipation. 2. Maximum allowable dissipation. Actual power dissipation: Maximum allowable power dissipation: In this example, the TC1188/TC1189 dissipates a max- imum of 26.7 mW below the allowable limit of 318 mW. In a similar manner, the power dissipation equation, as a function of VIN, VOUT and ILOAD, along with the power dissipation equation, as a function of maximum junction temperature, maximum ambient temperature and junc- tion to air thermal resistance, can be used to calculate maximum current and/or maximum input voltage limits. 4.0 APPLICATIONS INFORMATION 4.1 Input Capacitor A 1 µF (or larger) capacitor is recommended to bypass the LDO input and lower input impedance for circuit stability when operating from batteries or high imped- ance sources. The input capacitor can be ceramic, tan- talum or aluminum electrolytic. For applications that require low noise and input power supply rejection, low effective series resistance (ESR) ceramic capacitors are recommended over higher ESR electrolytic capac- itors. Larger value input capacitors can be used to improve circuit performance. 4.2 Output Capacitor A 1 µF (minimum) capacitor is required from V OUT to ground to ensure circuit stability. The output capacitor should have an ESR greater than 0.1 ohms and less than 2 ohm. Tantalum or aluminum electrolytic capaci- tors are recommended. Since many aluminum electro- lytic capacitors freeze at approximately -30°C, solid tantalums are recommended for applications operating below 25°C. PD = VIN(MAX) - VOUT(MIN) x ILOAD(MAX) PD = ((3.0 * 1.1) - (2.7 * 0.975)) * 40 mA PD = 26.7 mWatts PD = (TJ(MAX) - TA(MAX))/JA PD(MAX) = (125 - 55) / 220 PD(MAX) = 318 mWatts. |
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Descripción similar - TC1189 |
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