參數(shù)資料
型號(hào)： TPS5300DAPRG4
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3.3 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO32
封裝： GREEN, PLASTIC, HTSSOP-32
文件頁(yè)數(shù)： 6/23頁(yè)
文件大?。?/td> 476K
代理商： TPS5300DAPRG4
TPS5300
SLVS334A DECEMBER 2000 REVISED SEPTEMBER 2001
14
www.ti.com
detailed description (continued)
slowstart
The slowstart circuit controls the rate at which VOUT powers up. A capacitor is connected between the SLOWST
and ANAGND pins and is charged by an internal current source. The value of the current source is proportional
to the reference voltage, so that the charging rate of C(SLOWST) is proportional to the reference voltage. By
making the charging current proportional to Vref, the power up time for VO will be independent of Vref. Thus,
C(SLOWST) can remain the same value for all VP settings. The slowstart charging current is determined by the
following equation:
I
SLOWSTART +
I(VREFB)
5
(amps)
where, I(VREFB) is the current flowing out of the VREFB terminal. It is recommended that no additional loads be
connected to VREFB, other than the resistor divider for setting the hysteresis voltage. Thus, these resistor
values will determine the slowstart charging current. The maximum current that can be sourced by the VREFB
circuit is 500
A. The equation for setting the slowstart time is:
tSLOWSTART = 5 × C(SLOWSTART) × R(VREFB)
(seconds)
where, R(VREFB) is the total external resistance from VREFB to ANAGND.
VGATE
The VGATE circuit monitors for an undervoltage condition on VO(VSENSE_CORE), VO(VSENSE_IO), and
VO(VSENSE_CLK). If any VO is 7% below its reference voltage, or if any UVLO (Vcc, VR_ON) threshold is not
reached, then the VGATE pin is pulled low. The VGATE terminal is an open drain output.
overvoltage protection
The overvoltage protection circuit monitors VO(VSENSE_CORE), VO(VSENSE_IO), and VO(VSENSE_CLK) for an
overvoltage condition. If any VO is 15% above its reference voltage, then a fault latch is set, then both the ripple
regulator output drivers and the linear regulator drivers are turned off. The latch will remain set until VBIAS goes
below the undervoltage lockout value or until VR_ON is pulled low.
overcurrent protection
The overcurrent protection circuit monitors the current through the current sense resistor. The overcurrent
threshold is adjustable with an external resistor divider between IOUT and ANAGND terminals, with the divider
voltage connected to the OCP terminal. If the voltage on the OCP terminal exceeds 200 mV, then a fault latch
is set and the output drivers (ripple regulator and linear regulators) are turned off. The latch remains set until
VBIAS goes below the undervoltage lockout value or until VR_ON is pulled low.
thermal shutdown
Thermal shutdown disables the controller if the junction temperature exceeds the 165
°C thermal shutdown trip
point. The hysteresis is 10
°C.
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