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參數(shù)資料
| 型號： | TPS62677YFDT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PBGA6 |
| 封裝： | 0.40 MM HEIGHT, DSBGA-6 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 750K |
| 代理商： | TPS62677YFDT |
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SLVS952 – APRIL 2010
www.ti.com
SOFT START
The TPS6267x 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 35ns as a function of
the output voltage. This mode of operation continues for c.a. 100ms 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 MOSFET remains on until the inductor current has reset. After a further 100 ms, the
device ramps up to the full current limit operation if the output voltage has risen above 0.5V (approximately).
Therefore, the start-up time mainly depends on the output capacitor and load current.
UNDERVOLTAGE LOCKOUT
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 TPS6267x device
have a UVLO threshold set to 2.05V (typical). Fully functional operation is permitted down to 2.1V input voltage.
SHORT-CIRCUIT PROTECTION
The TPS6267x integrates a P-channel MOSFET current limit to protect the device against heavy load or short
circuits. When the current in the P-channel MOSFET reaches its current limit, the P-channel MOSFET is turned
off and the N-channel MOSFET is turned on. The regulator continues to limit the current on a cycle-by-cycle
basis.
As soon as the output voltage falls below ca. 0.4V, 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 approximately 0.5V. This needs to be considered
when a load acting as a current sink is connected to the output of the converter.
THERMAL SHUTDOWN
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.
20
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS6267x
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