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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： | 11/43页 |
| 文件大小： | 813K |
| 代理商： | TPS5110PWG4 |
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TPS5110
SLVS025B APRIL 2002 REVISED JULY 2004
19
www.ti.com
APPLICATION INFORMATION
output inductor selection
The required value for the output-filter inductor can be calculated by using the equation:
L
OUT +
VIN
* V
O
k
I
OUT
V
O
VIN
1
f
S
Where LOUT is output filter inductor value (H), VIN is the input voltage (V), Iout is the maximum output current
(A), fS is the switching frequency (Hz). Constant value k, a ratio of ripple current to output current, is typically
in the range 0.2 to 0.3. For VO1, the calculation for the maximum input voltage of 20 V, yields a value for L01
of 3.03
H, and for minimum input voltage of 8 V, 2.58 H. For the EVM, a value of 2.8 H is used for L01.
output inductor ripple current
The output-inductor current can affect not only the efficiency, but also the output voltage ripple. The equation
is exhibited below:
I
RIPPLE +
VIN
* V
O *
I
O
R
DS(on) )
RI
L
OUT
V
O
VIN
1
f
S
where IRIPPLE is the peak-to-peak ripple current (A) through the inductor; IO is the output current; RDS(on) is the
on-time resistance of MOSFET (
); Rl is the inductor dc resistance (). From the equation, it can be seen that
the current ripple can be adjusted by changing the output inductor value. For the EVM design, the worst-case
output ripple occurs with VIN = 20 V:
Example: VIN = 20 V; VO = 1.8 V; IO = 6 A; RDS(on) = 25 m; Rl = 10 m; Fs = 300 kHz; LOUT = 2.8 H.
Then, the ripple current IRIPPLE = 1.93 A
output capacitor selection (SBRC)
Selection of the output capacitor is basically dependent on the amount of peak-to-peak ripple voltage allowed
on the output and the ability of the capacitor to dissipate the RMS ripple current. Assuming that the ESR of the
output filter sees the entire inductor-ripple current then:
V
PP +
I
RIPPLE
R
ESR
And a suitable capacitor must be chosen so that the peak-to-peak output ripple is within the limits allowable for
the application.
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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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