参数资料
型号: TPS54140DGQR
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封装: GREEN, PLASTIC, MSOP-10
文件页数: 16/46页
文件大小: 1778K
代理商: TPS54140DGQR
EXT
IL
PH
EXT
IL
PH
VOUT
EXT
IL
PH
Power Good (PWRGD Pin)
www.ti.com .............................................................................................................................................................................................. SLVS889 – OCTOBER 2008
DETAILED DESCRIPTION (continued)
Figure 43. Plot of Synchronizing in ccm
Figure 44. Plot of Synchronizing in dcm
Figure 45. Plot of Synchronizing in PSM
The PWRGD pin is an open drain output. Once the VSENSE pin is between 94% and 107% of the internal
voltage reference the PWRGD pin is de-asserted and the pin floats. It is recommended to use a pull-up resistor
between the values of 10 and 100k
to a voltage source that is 5.5V or less. The PWRGD is in a defined state
once the VIN input voltage is greater than 1.5V but with reduced current sinking capability. The PWRGD will
achieve full current sinking capability as VIN input voltage approaches 3V.
The PWRGD pin is pulled low when the VSENSE is lower than 92% or greater than 109% of the nominal internal
reference voltage. Also, the PWRGD is pulled low, if the UVLO or thermal shutdown are asserted or the EN pin
pulled low.
Copyright 2008, Texas Instruments Incorporated
23
Product Folder Link(s): TPS54140
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