参数资料
型号: TC1313-ZD1EUN
元件分类: 稳压器
英文描述: 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10
封装: PLASTIC, MSOP-10
文件页数: 15/32页
文件大小: 591K
代理商: TC1313-ZD1EUN
TC1313
DS21974B-page 22
2009 Microchip Technology Inc.
5.8
Design Example
VOUT1 = 2.0V @ 500 mA
VOUT2 = 3.3V @ 300 mA
VIN =5V ±10%
L= 4.7 H
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 =190 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 = 190 mW + 685 mW = 875 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 = 875 mW x 113° C/Watt = 98.9°C
Max. Ambient
Temperature = 125°C - 98.9°C
Max. Ambient
Temperature = 26.1°C
10-Pin DFN
R
θJA = 41° C/Watt (4-Layer Board with
internal planes and 2 vias)
Junction Temp.
Rise = 875 mW x 41° C/Watt = 35.9°C
Max. Ambient
Temperature = 125°C - 35.9°C
Max. Ambient
Temperature = 89.1°C
This is above the +85°C max. ambient temperature.
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TC1313-ZE0EMF 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10
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TC1313-ZI0EMF 功能描述:低压差稳压器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压(最大值):307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
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TC1313-ZI0EUN 功能描述:低压差稳压器 - LDO PWM/LDO combo RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压(最大值):307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20