參數(shù)資料
型號： TPS54386PWPG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 7 A DUAL SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PDSO14
封裝： GREEN, PLASTIC, HTSSOP-14
文件頁數(shù)： 6/58頁
文件大?。?/td> 1773K
代理商： TPS54386PWPG4
www.ti.com
Output Voltage Sequencing
5-V VOUT1
(2 V/div)
3.3-V VOUT2
(2 V/div)
T - Time - 1 ms/div
SEQ = BP
Sequential
CH2 then CH1
T - Time - 1 ms/div
SEQ = GND
Sequential
CH1 then CH2
5-V VOUT1
(2 V/div)
3.3-V VOUT2
(2 V/div)
SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007
The TPS5438x allows single-pin programming of output voltage startup sequencing. During power-on, the state
of the SEQ pin is detected. Based on whether the pin is tied to BP, to GND, or left floating, the outputs behave
as described in Table 1.
Table 1. Sequence States
SEQ PIN STATE
MODE
EN1
EN2
Ignored by the device.when VEN2 <
enable threshold voltage
Tie EN1 to < enable threshold voltage
for BP to be active when VEN2 >
BP
Sequential, Output 2 then Output 1
Active
enable threshold voltage
Tie EN1 to > enable threshold voltage
for low quiescent current (BP inactive)
when VEN2 > enable threshold voltage
Ignored by the device.when VEN1 <
enable threshold voltage
Tie EN2 to < enable threshold voltage
for BP to be active when VEN1 >
GND
Sequential, Output 1 then Output 2
Active
enable threshold voltage
Tie EN2 to > enable threshold voltage
for low quiescent current (BP inactive)
when VEN1 > enable threshold voltage
Independent or Ratiometric, Output 1
Active. EN1 and EN2 must be tied
(floating)
and Output 2
together for Ratio-metric startup.
If the SEQ pin is connected to BP, then when Output 2 is enabled, Output 1 is allowed to start approximately 400
s after Output 2 has reached regulation; that is, sequential startup where Output 1 is slave to Output 2. If EN2 is
allowed to go high after the outputs have been operating, then both outputs are disabled immediately, and the
output voltages decay according to the load that is present.
If the SEQ pin is connected to GND, then when Output 1 is enabled, Output 2 is allowed to start approximately
400
s after Output 1 has reached regulation; that is, sequential startup where Output 2 is slave to Output 1. If
EN1 is allowed to go high after the outputs have been operating, then both outputs are disabled immediately,
and the output voltages decay according to the load that is present.
Figure 18. SEQ Pin TIed to BP
Figure 19. SEQ Pin Tied to GND
14
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS54383 TPS54386
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