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| 型号： | TPS5110PWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | GREEN, PLASTIC, TSSOP-24 |
| 文件页数： | 13/43页 |
| 文件大小： | 813K |
| 代理商： | TPS5110PWG4 |
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TPS5110
SLVS025B APRIL 2002 REVISED JULY 2004
20
www.ti.com
APPLICATION INFORMATION
output capacitor RMS current (SBRC)
Assuming the inductor-ripple current totally goes through the output capacitor to ground, the RMS current in
the output capacitor can be calculated as:
I
O(rms) +
I
RIPPLE
12
where IO(rms) is maximum RMS current in the output capacitor (A); IRIPPLE is the peak-to-peak inductor-ripple
current (A).
Example: IRIPPLE = 1.93 A, therefore, IO(rms) = 0.56 A
input capacitor RMS current (SBRC)
Assuming the input current totally goes into the input capacitor to the power ground, the RMS current in the input
capacitor can be calculated as:
I
i(rms) +
I
O
2
D
(1
* D) ) 1
12
D
I
RIPPLE
where Ii(rms) is the input RMS current in the input capacitor (A); IO is the output current (A); IRIPPLE is the
peak-to-peak output inductor-ripple current; D is the duty cycle and defined as VO/VI in this case. From the
equation, it can be seen that the highest input RMS current usually occurs at the lowest input voltage, so it is
the worst case design for input capacitor ripple current.
Example: IO = 6 A; D = 22.5 %; IRIPPLE = 1.6 A then, Ii(rms) = 2.5 A
The input capacitors must be chosen so that together they can safely handle the input-ripple current. Depending
on the input filtering and the dc input voltage source, not all the ripple current flows through the input capacitors,
but some may be present on the input leads to the EVM.
soft start
The soft-start timing can be adjusted by selecting the soft-start capacitor value. The equation is;
C
SOFT +
2.3
106
T
SOFT
0.85
where C(soft) is the soft-start capacitor (
F) (C04 in EVM design): TSOFT is the start-up time (s).
Example: TSOFT = 5 ms, therefore, CSOFT = 0.0135 F.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS5110PWR | 功能描述:DC/DC 开关控制器 Sync Buck w/NMOS LDO Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS5110PWRG4 | 功能描述:DC/DC 开关控制器 Sync Buck w/NMOS LDO Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51113 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONTROLLER WITH HIGH-CURRENT GATE DRIVER |
| TPS51113DRCR | 功能描述:DC/DC 开关控制器 4.5-13.2V Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51113DRCT | 功能描述:DC/DC 开关控制器 4.5-13.2V Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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