參數(shù)資料
型號: TPS65014RGZ
廠商: TEXAS INSTRUMENTS INC
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC48
封裝: 7 X 7 MM, GREEN, PLASTIC, VQFN-48
文件頁數(shù): 18/57頁
文件大?。?/td> 1289K
代理商: TPS65014RGZ
www.ti.com
UNDERVOLTAGE LOCKOUT
TPS65014
SLVS551 – DECEMBER 2004
The undervoltage lockout circuit for the four regulators on TPS65014 prevents the device from malfunctioning at
low input voltages and from excessive discharge of the battery. Basically, it prevents the converter from turning
on the power switch or rectifier FET under undefined conditions. The undervoltage threshold voltage is set by
default to 2.75 V. After power up, the threshold voltage can be reprogrammed through the serial interface. The
undervoltage lockout comparator compares the voltage on the VCC pin with the UVLO threshold. When the VCC
voltage drops below this threshold, the TPS65014 sets the PWRFAIL pin low and after a time t(UVLO) disables the
voltage regulators in the sequence defined by PS_SEQ. The same procedure is followed when the TPS65014
detects that its junction temperature has exceeded the overtemperature threshold, typically 160
°C, with a delay
t(overtemp). The TPS65014 automatically restarts when the UVLO (or overtemperature) condition is no longer
present.
The battery charger circuit has a separate UVLO circuit with a threshold of typically 2.5 V, which is compared
with the voltage on AC and USB supply pins.
25
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