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參數資料
| 型號： | TPS62601YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 6600 kHz SWITCHING FREQ-MAX, BGA6 |
| 封裝： | GREEN, DSBGA-6 |
| 文件頁數： | 6/24頁 |
| 文件大小： | 785K |
| 代理商： | TPS62601YFFT |
SOFT START
UNDERVOLTAGE LOCKOUT
SHORT-CIRCUIT PROTECTION
THERMAL SHUTDOWN
SLVS678 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
The TPS6260x has an internal soft-start circuit that limits the inrush current during start-up. This limits input
voltage drops when a battery or a high-impedance power source is connected to the input of the converter. The
soft-start system progressively increases the on-time from a minimum pulse-width of 30ns as a function of the
output voltage. This mode of operation continues for c.a. 180
s after enable. Should the output voltage not have
reached its target value by this time, such as in the case of heavy load, the soft-start transitions to a second
mode of operation.
The converter then operates in a current limit mode, specifically the P-MOS current limit is set to half the nominal
limit, and the N-channel MOSET remains on until the inductor current has reset. After a further 100
s, the
device ramps up to the full current limit operation if the output voltage has risen above 0.7V (approximately).
Therefore, the start-up time mainly depends on the output capacitor and load current.
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions. The TPS6260x device
have a UVLO threshold set to 2.05V (typical). Fully functional operation is permitted down to 2.1V input voltage.
As soon as the output voltage falls below 0.7V (approximately), the converter current limit is reduced to half of
the nominal value. Because the short-circuit protection is enabled during start-up, the device does not deliver
more than half of its nominal current limit until the output voltage exceeds 0.7V (approximately). This needs to be
considered when a load acting as a current sink is connected to the output of the converter.
As soon as the junction temperature, TJ, exceeds typically 140°C, the device goes into thermal shutdown. In this
mode, the P- and N-channel MOSFETs are turned off. The device continues its operation when the junction
temperature again falls below typically 130°C.
14
Copyright 2008, Texas Instruments Incorporated
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