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参数资料
| 型号： | TPS40022PWPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | POWERPAD, PLASTIC, HTSSOP-16 |
| 文件页数： | 6/29页 |
| 文件大小： | 337K |
| 代理商： | TPS40022PWPR |
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TPS40020
TPS40021
TPS40022
SLUS535 – MARCH 2003
www.ti.com
14
APPLICATION INFORMATION
Transient Comparators and Power Good
The TPS4002x makes use of a separate pin, OSNS, to monitor output voltage for these two functions. In normal
operation, OSNS is connected to the output of a voltage divider at the output. It is important to make this divider
the same ratio as the divider for the feedback network so that in normal operation the voltage at OSNS is the
same as the voltage at FB, 0.7 V nominal.
The PWRGD pin is an open drain output that is pulled low when the device senses that power is NOT good.
PWRGD is released only when the voltage at OSNS falls within 0.7 V
±4.5% (approximately). If this condition
is not met, PWRGD is then pulled low. A delay has been purposely built into the PWRGD pin pulling low in
response to an out of band voltage on OSNS. This is to minimize the need for filtering the signal in the event
of a noise glitch causing a brief out of band OSNS voltage. The PWRGD signal goes high when the OSNS signal
returns to approximately
±1% of nominal (0.7 V ±1%).
The transient comparators provide an improvement in load transient recovery time if used properly. In some
situations, recovery time may be one half of the time required without transient comparators. Keep in mind that
the transient comparator concept is a double-edged sword. While they provide improved transient recovery
time, they can also lead to instability if incorrectly applied. For proper functionality, the first thing to do is design
a feedback loop for the converter that places the open loop unity gain frequency higher than the resonant
frequency of the output L-C filter. If not, the feedback loop cannot respond to the ring of the L-C on a transient
event. The ring is likely to be large enough to disturb the transient comparators and the result is a power
oscillator. Another helpful action is to ground the feedback loop divider and the OSNS divider at the SGND pin.
Make sure both dividers measure the same physical location on the output bus. These help avoid problems
with resistive drops at higher loads causing problems.
Connecting OSNS to VDD disables the transient comparators. This also disables the PWRGD function.
Alternatively, OSNS and FB can be tied together. This connection allows a proper PWRGD at startup, though
transient performance of the PWRGD signal diminishes.
CSS SS/SD
6
TPS4002x
SHUTDOWN
3.7
A
Figure 7. Shutdown Implementation
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相关代理商/技术参数 |
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| TPS40040 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW PIN COUNT, LOW VIN (2.5 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH ENABLE |
| TPS40040DRBR | 功能描述:DC/DC 开关控制器 Lo Vin Synch Buck DC/DC 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 |
| TPS40040DRBRG4 | 功能描述:DC/DC 开关控制器 Lo Vin Synch Buck DC/DC 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 |
| TPS40040DRBT | 功能描述:DC/DC 开关控制器 Low Vin Synch Buck DC/DC Controller 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 |
| TPS40040DRBT | 制造商:Texas Instruments 功能描述:Peak Reflow Compatible (260 C):Yes |
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