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| 型号： | TPS5103IDBG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, SSOP-20 |
| 文件页数： | 16/40页 |
| 文件大小： | 1225K |
| 代理商： | TPS5103IDBG4 |
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TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output capacitor RMS current
Where IO(rms) is the maximum RMS current in the output capacitor (A), and I is the peak-to-peak inductor ripple
current (A).
Example:
I = 2 A, so IO(rms) = 0.58 A
input capacitor RMS current
Assuming the input ripple 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 2
o
D
(1
* D) ) 1
12
D
Iripple2
Where II(rms) is the input RMS current in the input capacitor (A), IO is the output current (A), and D is the duty
cycle. 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 the input capacitor ripple current.
Example: IO = 5 A; D = 0.36
Then, II(rms)= 3.36 A
softstart
The softstart timing can be adjusted by selecting the soft-start capacitor value. The equation is shown below.
C
(soft) +
2
T
(soft)
Where C(soft) is the softstart capacitance (F), T(soft) is the start-up time on the softstart terminal (s).
Example: T(soft) = 5 ms, so, C(soft) = 0.01 F.
current protection
The current protection in the TPS5103 is set using an internal current source and an external resistor to set up
the current limit. The sensed, high-side MOSFET drain-to-source voltage drop is compared to the set point, if
the voltage drop exceeds the limit, the internal oscillator is activated, and continuously resets the current limit
until the over-current condition is removed. The equation below should be used for calculating the external
resistor value for current protection:
Rcl
+
r
ds(on)
I
(trip) )
Iind(p-p) 2
0.000015
PWM or HYS mode
Rcl
+
r
ds(on)
I
(trip) )
Iind(p-p) 2
0.000005
SKIP mode
Where, Rcl is the external current limit resistor (R10, R11), rds(on) is the high side MOSFET on-time resistance,
I(trip) is the required current limit, and Iind(p-p) is the peak-to-peak output inductor current.
Example: PWM mode or HYS mode
rds(on) = 10 m, I(trip) = 5 A, Iind(p-p) = 2 A, so Rcl = 4 k
Example: SKIP mode
rds(on) = 10 m, I(trip) = 2 A, Iind(p-p) = 1 A, so Rcl = 5 k
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|---|---|
| TPS5103IDBR | 功能描述:DC/DC 开关控制器 Synch Buck Cntrlr 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 |
| TPS5103IDBRG4 | 功能描述:DC/DC 开关控制器 Synch Buck Cntrlr 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 |
| TPS5110 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-A SINK/ SOURCE DDR TERMINATION REGULATOR |
| TPS51100 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-A SINK/SOURCE DDR TERMINATION REGULATOR |
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