參數(shù)資料
型號： TPS54362QPWPRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 8 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20
封裝： GREEN, PLASTIC, HTSSOP-20
文件頁數(shù)： 6/34頁
文件大?。?/td> 826K
代理商： TPS54362QPWPRQ1
0.92xVReg
VIN
VReg
Cdly
RST
tdelay
Css
VIN
VReg
Cdly
RST
Css
SetbyRST_TH
Terminal
20 s
(Typ-DeglitchTime)
m
SLVS845C – MARCH 2009 – REVISED MAY 2010
www.ti.com
ENABLE / SHUTDOWN:(EN)
The Enable pin provides electrical on/off control of the regulator. Once the Enable pin voltage exceeds the
threshold voltage, the regulator starts operation and the internal soft start begins to ramp. If the Enable pin
voltage is pulled below the threshold voltage, the regulator stops switching and the internal soft start resets.
Connecting the pin to ground or to any voltage less than 0.7V disables the regulator and activate the shutdown
mode. This pin must have an external pull up or pull down to change the state of the device.
RESET DELAY (Cdly)
The Reset delay pin sets the desired delay time to assert the RESET pin high after the supply has exceeded the
programmed VReg_RST voltage. The delay may be programmed in the range of 2.2ms to 200ms using
capacitors in the range of 2.2nF to 200nF. The delay time is calculated using the following equation:
PORdly = 1ms / nF × C, Where C = capacitor on Cdly pin
(3)
RESET PIN (nRST)
The RESET pin is an open-drain output. The power-on reset output is asserted low until the output voltage
exceeds the programmed VReg_RST voltage threshold and the reset delay timer has expired. Additionally,
whenever the ENABLE pin is low or open, RESET is immediately asserted low regardless of the output voltage.
There is a reset filter timer to prevent reset being invoked due to short negative transients on the output line. If a
thermal shut down occurs due to excessive thermal conditions this pin is asserted low when the switching FET is
commanded OFF and output falls below the reset threshold.
Power On Condition/ Reset Line
Power Down Condition/ Reset Line
BOOST CAPACITOR (BOOT)
This capacitor provides the gate drive voltage for the Internal MOSFET switch. X7R or X5R grade dielectrics are
recommended due to their stable values over temperature. Boost cap may need to be tweaked lower for low
Vreg and/or high frequencies applications. The cap may need to be tweaked higher for high Vreg and/or low
frequencies applications. (e.g. 100nF for 500kHz/5V and 220n for 500kHz/8V.)
14
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS54362-Q1
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