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| 型号： | TC1303B-CJ0EMFTR |
| 元件分类： | 稳压器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, 0.9 MM HEIGHT, PLASTIC, DFN-10 |
| 文件页数： | 21/38页 |
| 文件大小： | 756K |
| 代理商： | TC1303B-CJ0EMFTR |
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TC1303A/TC1303B/TC1303C/TC1304
DS21949C-page 28
2008 Microchip Technology Inc.
5.8
Design Example
VOUT1 = 2.0V @ 500 mA
VOUT2 = 3.3V @ 300 mA
VIN = 5V±10%
L = 4.7H
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
IL =(VL/L) x TON =128 mA
Peak inductor current:
IL(PK) =IOUT1+1/2IL = 564 mA
Switcher power loss:
Use efficiency estimate for 1.8V from Figure 2-8
Efficiency = 84%, PDISS1 =190 mW
Resistor Divider:
RTOP =200 k
RBOT =133 k
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 = 190 mW + 685 mW = 874 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 = 874 mW x 113° C/Watt = 98.8°C
Max. Ambient
Temperature = 125°C - 98.8°C
Max. Ambient
Temperature = 26.3°C
10-Pin DFN
R
θJA = 41° C/Watt (4-Layer Board with
internal planes and 2 vias)
Junction Temp.
Rise = 874 mW x 41° C/Watt = 35.8°C
Max. Ambient
Temperature = 125°C - 35.8°C
Max. Ambient
Temperature = 89.2°C
This is above the +85°C max. ambient temperature.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1303B-CJ0EUN | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-CJ0EUNTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-CJ1EMF | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-CJ1EMFTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| TC1303B-CJ1EUN | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
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