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参数资料
| 型号： | PTH08T255WAZT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | PLASTIC, MODULE-22 |
| 文件页数： | 21/34页 |
| 文件大小： | 4336K |
| 代理商： | PTH08T255WAZT |
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t-Time-4ms/div
V
(1V/div)
O
I
(2 A/div)
O
V
(1V/div)
IN
ASIC
+
V
o
=2.5V
3.3V
V
I
=5V
R
2.37kW
SET
VCORE
VCCIO
I
o
PTH08T220W
Track
V
I
V
O
GND
Inhibit
Vadj
+Sense
C
I
+
C
O
-Sense
SLTS290 – NOVEMBER 2008 ........................................................................................................................................................................................... www.ti.com
The prebias start-up feature is not compatible with Auto-Track. When the module is under Auto-Track control, it
sinks current if the output voltage is below that of a back-feeding source. To ensure a pre-bias hold-off one of
two approaches must be followed when input power is applied to the module. The Auto-Track function must
either be disabled(3), or the module’s output held off (for at least 50 ms) using the Inhibit pin. Either approach
ensures that the Track pin voltage is above the set-point voltage at start up.
1. Startup includes the short delay (approximately 10 ms) prior to the output voltage rising, followed by the rise
of the output voltage under the module’s internal soft-start control. Startup is complete when the output
voltage has risen to either the set-point voltage or the voltage at the Track pin, whichever is lowest.
2. To ensure that the regulator does not sink current when power is first applied (even with a ground signal
applied to the Inhibit control pin), the input voltage must always be greater than the output voltage throughout
the power-up and power-down sequence.
3. The Auto-Track function can be disabled at power up by immediately applying a voltage to the module’s
Track pin that is greater than its set-point voltage. This can be easily accomplished by connecting the Track
pin to VI.
Figure 23. Prebias Startup Waveforms
Figure 24. Application Circuit Demonstrating Prebias Startup
28
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): PTH08T255W
相关PDF资料 |
PDF描述 |
|---|---|
| PTH08T255WAST | DC-DC REG PWR SUPPLY MODULE |
| PTH08T255WAD | DC-DC REG PWR SUPPLY MODULE |
| PTH08T261WAD | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T260WAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T261WAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PTH08T260W | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
| PTH08T260WAD | 功能描述:DC/DC转换器 3-A 4.5V to 14V Input RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T260WAS | 功能描述:DC/DC转换器 3-A 4.5V to 14V Input RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T260WAST | 功能描述:DC/DC转换器 3-A 4.5V to 14V Input RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T260WAZ | 功能描述:DC/DC转换器 3-A 4.5V to 14V Input RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
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