參數(shù)資料
型號(hào)： 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(yè)數(shù)： 8/34頁(yè)
文件大?。?/td> 826K
代理商： TPS54362QPWPRQ1
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-SlewResistor-k
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SLVS845C – MARCH 2009 – REVISED MAY 2010
www.ti.com
Note: In LPM, the OV_TH circuit is not enabled.
Active or Normal Mode: When the device is in CCM or DCM with LPM = High
LPM: When the device is in DCM with LPM = Low
SHORT CIRCUIT PROTECTION
The TPS54362 features an output short-circuit protection. Short-circuit conditions are detected by monitoring the
RST_TH, and when the voltage on this node drops below 0.2V, the switching frequency is decreased and current
limit is folded back to protect the device. The switching frequency is fold back to approximately 25kHz and the
current limit is reduced to 30% of the current limit typical value.
OVERCURRENT PROTECTION
Overcurrent protection is implemented by sensing the current through the NMOS switch FET. The sensed
current is then compared to a current reference level representing the overcurrent threshold limit. If the sensed
current exceeds the overcurrent threshold limit, the overcurrent indicator is set true. The system will ignore the
overcurrent indicator for the leading edge blanking time at the beginning of each cycle to avoid any turn-on noise
glitches.
Once overcurrent indicator is set true, overcurrent protection is triggered. The MOSFET is turned off for the rest
of the cycle after a propagation delay. The overcurrent protection scheme is called cycle-by-cycle current limiting.
If the sensed current continues to increase during cycle-by-cycle current limiting, the temperature of part will start
rising, the TSD will kick in and shut down switching until part cools down.
SLEW RATE CONTROL (Rslew)
This pin controls the switching slew rate of the internal power NMOS. The slew rate will be set by an external
resistor with a slew rate range shown below for rise and fall times. The range of rise time tr = 15ns to 35ns, and
fall time tf = 15ns to 200ns, with Rslew range of 10k to 50k (see plots below).
Figure 14. FET Rise Time
Figure 15. FET Fall Time
THERMAL SHUTDOWN
The TPS54362 protects itself from overheating with an internal thermal shutdown circuit. If the junction
temperature exceeds the thermal shutdown trip point, the MOSFET is turned off. The part is restarted under
control of the slow start circuit automatically when the junction temperature drops below the thermal shutdown
hysteretic trip point. During low power mode operation the thermal shutdown sensing circuitry is disabled for low
current consumption. Once RST or VReg_UV is asserted low the thermal shutdown monitoring is activated.
REGULATION VOLTAGE (VSENSE)
This pin is used to program the regulated output voltage based on a resistor feedback network monitoring the VO
output voltage. The selected ratio of R4 to R5 will set the VReg voltage.
16
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS54362-Q1
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