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TC1303B-BH2EUNTR 数据表(PDF) 21 Page - Microchip Technology |
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TC1303B-BH2EUNTR 数据表(HTML) 21 Page - Microchip Technology |
21 / 30 page © 2005 Microchip Technology Inc. DS21949A-page 21 TC1303B 5.8 Design Example VOUT1 =2.0V @ 500 mA VOUT2 =3.3V @ 300 mA VIN =5V±10% L = 4.7µH Calculate PWM mode inductor ripple current Nominal Duty Cycle = 2.0V/5.0V = 40% P-channel Switch-on time = 0.40 x 1/(2 MHz) = 200 ns VL =(VIN-VOUT1)= 3V ΔIL =(VL/L) x TON =128 mA Peak inductor current: IL(PK) =IOUT1+1/2ΔIL = 564 mA Switcher power loss: Use efficiency estimate for 1.8V from Figure 2-7 Efficiency = 84%, PDISS1 = 171 mW Resistor Divider: RTOP = 200 kΩ RBOT = 133 kΩ LDO Output: PDISS2 =(VIN(MAX) – VOUT2(MIN))x IOUT2(MAX) PDISS2 = (5.5V – (0.975) x 3.3V) x 300 mA PDISS2 = 684.8 mW Total Dissipation = 171 mW + 685 mW = 856 mW Junction Temp Rise and Maximum Ambient Operating Temperature Calculations 10-Pin MSOP (4-Layer Board with internal Planes) R θJA =113° C/Watt Junction Temp. Rise = 856 mW x 113° C/Watt = 96.7°C Max. Ambient Temperature = 125°C - 96.7°C Max. Ambient Temperature = 28.3°C 10-Pin DFN R θJA = 41° C/Watt (4-Layer Board with internal planes and 2 vias) Junction Temp. Rise = 856 mW x 41° C/Watt = 35.1°C Max. Ambient Temperature = 125°C - 35.1°C Max. Ambient Temperature = 89.9°C This is above the 85°C max. ambient temperature. |
类似零件编号 - TC1303B-BH2EUNTR |
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类似说明 - TC1303B-BH2EUNTR |
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