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參數(shù)資料
| 型號： | TPS62691YFFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.6 A SWITCHING REGULATOR, 4400 kHz SWITCHING FREQ-MAX, BGA6 |
| 封裝： | DSBGA-6 |
| 文件頁數(shù)： | 10/27頁 |
| 文件大小： | 870K |
| 代理商： | TPS62691YFFT |
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SLVS965
– MARCH 2011
ENABLE
The TPS6269x device starts operation when EN is set high and starts up with the soft start as previously
described. For proper operation, the EN pin must be terminated and must not be left floating.
Pulling the EN pin low forces the device into shutdown, with a shutdown quiescent current of typically 0.2
μA. In
this mode, the P and N-channel MOSFETs are turned off, the internal resistor feedback divider is disconnected,
and the entire internal-control circuitry is switched off.
The TPS6269x device can actively discharge the output capacitor when it turns off. The integrated discharge
resistor has a typical resistance of 100
. The required time to discharge the output capacitor at the output node
depends on load current and the output capacitance value.
SOFT START
The TPS6269x 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. 150
μs after enable. Should the output voltage not
have reached its target value by this time, such as a 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 150
μs, 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 TPS6269x 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 TPS6269x 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.
18
2011, Texas Instruments Incorporated
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