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參數(shù)資料
型號: TPS65562RGT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: BATTERY CHARGE CONTROLLER, PQCC16
封裝: PLASTIC, QFN-16
文件頁數(shù): 2/16頁
文件大小: 534K
代理商: TPS65562RGT
www.ti.com
Protections
MAX ON TIME
MAX OFF TIME
THERMAL DISABLE
OVER CURRENT SHUTDOWN
SLVS775 – JUNE 2007
PRINCIPLES OF OPERATION (continued)
Figure 8. Relationships Between F_ON and CHG
TPS65562 provides four protection mechanisms: max on time, max off time, thermal disable, and over current
shutdown.
To prevent a condition such as pulling current from a poor power source (i.e., an almost empty battery), and
never reaching peak current, the TPS65562 provides a maximum ON time function. If the ON time exceeds tMAX,
the TPS5562 is forced OFF regardless of IPEAK detection.
To prevent a condition such as never increasing the voltage at the SW pin when the internal FET is OFF, the
TPS65562 provides a maximum OFF time function. If the OFF time exceeds tMIN, the TPS65562 is forced ON
regardless of VZERO detection.
Once the die temperature of the TPS65562, reaches 160
°C, all functions stop. Once the die cools below 160°C,
the TPS65562 restarts charging if CHG remains high during the entire over temperature condition.
The TPS65562 provides an over voltage monitor function of the SW pin. The TPS65562 is latched off if the
voltage on the SW pin is above OVDS during the switch ON time (see Figure 4 and its descriptions).
This function protects against short-circuits on the primary side of the transformer. A short-circuit of the primary
side shorts the battery voltage to GND. SW pin can damage the device if not protected.
10
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