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参数资料
| 型号： | TPS40074RHL |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | PLASTIC, QFN-20 |
| 文件页数： | 10/37页 |
| 文件大小： | 448K |
| 代理商： | TPS40074RHL |
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PRE-BIASED OUTPUTS
TPS40074
SLUS617–APRIL 2005
APPLICATION INFORMATION (continued)
VFB >0.77V
Programmable UVLO condition not satisfied (VIN below programmed level)
Overcurrent condition exists
Die temperature is greater than 165°C
Some applications require that the converter not sink current during startup if a pre-existing voltage exists at the
output. Since synchronous buck converters inherently sink current some method of overcoming this characteristic
must be employed. Applications that require this operation are typically power rails for a multi supply processor
or ASIC. The method used in this controller, is to not allow the low side or rectifier FET to turn on until there the
output voltage commanded by the start up ramp is higher than the pre-existing output voltage. This is detected
by monitoring the internal pulse width modulator (PWM) for its first output pulse. Since this controller uses a
closed loop startup, the first output pulse from the PWM does not occur until the output voltage is commanded to
be higher than the pre-existing voltage. This effectively limits the controller to sourcing current only during the
startup sequence.
If the pre-existing voltage is higher that the intended regulation point for the output of the converter, the converter
starts and sinks current when the soft-start time has completed
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40074RHLR | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLRG4 | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLT | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLTG4 | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40075 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4.5V TO 18V INPUT 10 PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD |
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