參數(shù)資料
型號(hào)： PTV12010WAH
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封裝： SIP-8
文件頁(yè)數(shù)： 6/22頁(yè)
文件大?。?/td> 386K
代理商： PTV12010WAH
www.ti.com
Q1VDS (2 V/div)
VO (2 V/div)
II (2 A/div)
t Time 40 ms/div
SLTS234B – DECEMBER 2004 – REVISED FEBRUARY 2007
Figure 13. Power-Up from Track Control
NOTE:
If a prebias condition is not present, it is highly recommended that the Track control
pin be used for controlled power-up and power-down. If Track control is not used, the
output voltage starts up and overshoots by as much as 10%, before settling at the
output voltage setpoint.
How Auto-Track Works
Auto-Track works by forcing the module output voltage to follow a voltage presented at the Track control pin (1).
This control range is limited to between 0 V and the module set-point voltage. Once the track-pin voltage is
raised above the set-point voltage, the module output remains at its set-point (2). As an example, if the Track pin
of a 2.5-V regulator is at 1 V, the regulated output is 1 V. If the voltage at the Track pin rises to 3 V, the
regulated output does not go higher than 2.5 V.
When under Auto-Track control, the regulated output from the module follows the voltage at its Track pin on a
volt-for-volt basis. By connecting the Track pin of a number of these modules together, the output voltages follow
a common signal during power up and power down. The control signal can be an externally generated master
ramp waveform, or the output voltage from another power supply circuit (3). For convenience, the Track input
incorporates an internal RC-charge circuit. This operates off the module input voltage to produce a suitable
rising waveform at power up.
14
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