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参数资料
| 型号： | TPS84320RUQT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PQCC47 |
| 封装： | 9 X 15 MM, 2.80 MM HEIGHT, GREEN, PLASTIC, QFN-47 |
| 文件页数： | 10/28页 |
| 文件大小： | 903K |
| 代理商： | TPS84320RUQT |
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SLUSAH7
– SEPTEMBER 2011
Power-Up Characteristics
When configured as shown in the front page schematic, the TPS84320 produces a regulated output voltage
following the application of a valid input voltage. During the power-up, internal soft-start circuitry slows the rate
that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the input
source. The soft-start circuitry introduces a short time delay from the point that a valid input voltage is
recognized. Figure 27 shows the start-up waveforms for a TPS84320, operating from a 5-V input (PVIN=VIN)
and with the output voltage adjusted to 1.8 V. Figure 28 shows the start-up waveforms for a TPS84320 starting
up into a pre-biased output voltage. The waveforms were measured with a 2-A constant current load.
Figure 27. Start-Up Waveforms
Figure 28. Start-up into Pre-bias
Pre-Biased Start-Up
The TPS84320 has been designed to prevent discharging a pre-biased output. During monotonic pre-biased
startup, the TPS84320 does not allow current to sink until the SS/TR pin voltage is higher than 1.4 V.
Remote Sense
The SENSE+ pin must be connected to VOUT at the load, or at the device pins.
Connecting the SENSE+ pin to VOUT at the load improves the load regulation performance of the device by
allowing it to compensate for any I-R voltage drop between its output pins and the load. An I-R drop is caused by
the high output current flowing through the small amount of pin and trace resistance. This should be limited to a
maximum of 300 mV.
NOTE
The remote sense feature is not designed to compensate for the forward drop of nonlinear
or frequency dependent components that may be placed in series with the converter
output. Examples include OR-ing diodes, filter inductors, ferrite beads, and fuses. When
these components are enclosed by the SENSE+ connection, they are effectively placed
inside the regulation control loop, which can adversely affect the stability of the regulator.
18
Copyright
2011, Texas Instruments Incorporated
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