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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： | 7/45页 |
| 文件大小： | 917K |
| 代理商： | TPS40200HD |
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2
8
5
+
S Q
Q
R
Latched
Fault
150 mV
VDD
SS
GND
+
Fault
TPS40200
100 mV
Reset
Fault
7
ISNS
Enable
EAMP
+ 300 mV
EAMP
SS Ref
V
S-S
100 kW
300
kW
www.ti.com
SGLS400B – OCTOBER 2009 – REVISED MAY 2010
Current-Limit Resistor Selection
As shown in Figure 28, a resistor in series with the power MOSFET sets the overcurrent protection level. Use a
low-inductance resistor to avoid problems with ringing signals and nuisance tripping. When the FET is on and the
controller senses 100 mV or more drop from the VDD pin to theISNS pin, an overcurrent condition is declared.
When this happens, the FET is turned off and, as shown in Figure 29, the soft-start capacitor is discharged.
When the soft-start capacitor reaches a level below 150 mV, the converter clears the overcurrent condition flag
and attempts to restart. If the condition that caused the overcurrent event to occur is still present on the output of
the converter (see Figure 28), another overcurrent condition is declared and the process repeats indefinitely.
Figure 28 shows the soft-start capacitor voltage during an extended output fault condition. The overall duty cycle
of current conduction during a persistent fault is approximately 2%.
Figure 26. Typical Soft-Start Capacitor and VOUT During Overcurrent
Figure 27. Current-Limit Reset
Copyright 2009–2010, Texas Instruments Incorporated
15
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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