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| 型号： | PTH08T220WAZ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, PLASTIC, DIP-11 |
| 文件页数： | 24/38页 |
| 文件大小： | 1290K |
| 代理商： | PTH08T220WAZ |
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Prebias Startup Capability
t-Time-4ms/div
V (1V/div)
O
I (2 A/div)
O
V
(1V/div)
IN
SLTS252K – NOVEMBER 2005 – REVISED JUNE 2009................................................................................................................................................... www.ti.com
A prebias startup condition occurs as a result of an external voltage being present at the output of a power
module prior to its output becoming active. This often occurs in complex digital systems when current from
another power source is backfed through a dual-supply logic component, such as an FPGA or ASIC. Another
path might be via clamp diodes as part of a dual-supply power-up sequencing arrangement. A prebias can cause
problems with power modules that incorporate synchronous rectifiers. This is because under most operating
conditions, these types of modules can sink as well as source output current.
The PTH family of power modules incorporate synchronous rectifiers, but does not sink current during startup(1),
or whenever the Inhibit pin is held low. However, to ensure satisfactory operation of this function, certain
conditions must be maintained(2). Figure 33 shows an application demonstrating the prebias startup capability.
The startup waveforms are shown in Figure 32. Note that the output current (IO) is negligible until the output
voltage rises above the voltage backfed through the intrinsic diodes.
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 32. Prebias Startup Waveforms
30
Copyright 2005–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH08T220W PTH08T221W
相关PDF资料 |
PDF描述 |
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| PTH08T221WAS | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T221WAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T221WAZT | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T220WAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T220WAZT | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PTH08T220WAZ | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| PTH08T220WAZT | 功能描述:DC/DC转换器 16A 4.5-14V-Input Wide-Out Adj Pwr Mdl 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: |
| PTH08T221W | 制造商:TI 制造商全称:Texas Instruments 功能描述:16-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
| PTH08T221WAD | 功能描述:DC/DC转换器 16A 4.5V to 14V Inp Ceramic Cap Version 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: |
| PTH08T221WAD | 制造商:Texas Instruments 功能描述:Power Module |
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