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| 型号： | TPS40200HD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, SOIC-8 |
| 文件页数： | 8/45页 |
| 文件大小： | 917K |
| 代理商： | TPS40200HD |
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2
F
2
F
1
F
ILIM
OC
R
V
=
I
+
SW
IN
O
f
V
C
f2
f1
R
f2
f1
R
+
÷
8
7
VDD
ISNS
R
ILIM
6
GDRV
V
IN
R
F1
R
F2
C
F
TPS40200
SGLS400B – OCTOBER 2009 – REVISED MAY 2010
www.ti.com
If necessary, a small R-C filter can be added to the current-sensing network to reduce nuisance tripping due to
noise pickup. This filter also can be used to trim the overcurrent trip point to a higher level with the addition of a
single resistor. See Figure 28. The nominal overcurrent trip point using the circuit of Figure 28 is described as:
(3)
Where:
IOC = Overcurrent trip point, peak current in the inductor
VILIM = Overcurrent threshold voltage for the TPS40200, typically 100 mV
RILIM = Value of the current sense resistor (in )
RF1 and RF2 = Values of the scaling resistors (in )
The value of the capacitor is determined by the nominal pulse width of the converter and the values of the
scaling resistors RF1 and RF2. It is best not to have the time constant of the filter longer than the nominal pulse
width of the converter, otherwise a substantial increase in the overcurrent trip point occurs. Using this constraint,
the capacitor value may be bounded by: .
(4)
Where:
Cf = Value of the current-limit filter capacitor (in F)
VO = Output voltage of the converter
VIN = Input voltage to the converter
fSW = Converter switching frequency
Rf1 and Rf2 = Values of the scaling resistors (in )
NOTE: The current-limit resistor and its associated circuitry can be eliminated and pins 7 and 8 shorted. However, the result
of this may result in damage to the part or PC board in the event of an overcurrent event.
Figure 28. Current-Limit Adjustment
16
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40200-HT
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相关代理商/技术参数 |
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|---|---|
| TPS40200-HT | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT-RANGE NONSYNCHRONOUS VOLTAGE-MODE CONTROLLER |
| TPS40200MDREP | 功能描述:DC/DC 开关控制器 Mil Enhanced Nonsync Vltg-Mode 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 |
| TPS40200MDREPG4 | 功能描述:电压模式 PWM 控制器 EP DC/DC CONTROLLER RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40200-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT-RANGE NONSYNCHRONOUS VOLTAGE-MODE CONTROLLER |
| TPS40200QDRQ1 | 功能描述:DC/DC 开关控制器 Wide-Inp-Rng Nonsync Vltg-Mode 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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