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| 型号： | TPS5102IDBTRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO30 |
| 封装： | GREEN, PLASTIC, TSSOP-30 |
| 文件页数： | 9/34页 |
| 文件大小： | 1182K |
| 代理商： | TPS5102IDBTRG4 |
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TPS5102
DUAL, HIGH-EFFICIENCY CONTROLLER FOR NOTEBOOK PC POWER
SLVS239 - SEPTEMBER 1999
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
current protection
The current limit in TPS5102 on each channel is set using an internal current source and an external resistor
(R18 or R19). 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 it continuously reset 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 setpoint:
Rcl
+
Rds(on)
(
Itrip
) Iind(p-p) 2)
0.000015
In skip mode,
Rcl
+
Rds(on)
(
Itrip
) Iind(p-p) 2)
0.000005
Where Rcl is the external current limit resistor (R10 or R11); Rds(on) is the high side MOSFET (Q1 or Q3)
on-time resistance. Itrip is the required current limit; Iind(p-p) is the peak-to-peak output inductor current.
Example for voltage mode: Rds(on) = 10 m
, Itrip = 5 A, Iind = 2 A, so Rcl = 4 k.
loop-gain compensation
Voltage mode control is used in this controller for the output voltage regulation. To achieve fast, stabilized
control, two parts are discussed in this section: the power stage small signal modeling and the compensation
circuit design.
For the buck converter, the small signal modeling circuit is shown below:
+
-
ac
ia
ic
p
D
1
Vap
D
d
∧
Ic d
∧
+
VI
RL
L
ZL
C
R
RC
ZRC
VO
From this equivalent circuit, several control transfer functions can be derived: input-to-output, output
impedance, and control-to-output. Typically the control-to-output transfer function is used for the feedback
control design.
Assuming Rc and RL are much smaller than R, the simplified small signal control-to-output transfer function is:
Vod
+ Vo
d
+
(1
) sCRc)
1
) s C
Rc
) R
L )
L
R )
s2LC
∧
Where C is the output capacitance; Rc is the equivalent serial resistance (ESR) in the output capacitor; L is the
output inductor; RL is the equivalent serial resistance (DCR) in the output inductor; R is the load resistance.
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| TPS5103EVM-136 | 功能描述:电源管理IC开发工具 PWM/Hysteretic Buck Contr RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS5103IDB | 功能描述:DC/DC 开关控制器 Synch BuckController 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 |
| TPS5103IDBG4 | 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 |
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