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參數資料
型號: TPS65162RGZR
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩壓器
英文描述: 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC48
封裝: 7 X 7 MM, PLASTIC, VQFN-48
文件頁數: 8/36頁
文件大小: 1034K
代理商: TPS65162RGZR
Vlogic
VGL
DLY
1
Vs
VGHM
withVFLK
=high,
VDPM=high
DLY
2
Falltimedependsonoutput
capacitorsvalueandloadcurrent
EN2
EN1
SETTING THE DELAY TIMES DLY1, DLY2
V
280
.
1
t
A
5
V
t
A
5
C
d
REF
d
dly
m
=
m
=
(1)
C
dly +
5 mA
5.3 ms
1.280 V
+ 20.7 nF [ 22 nF
(2)
SLVS771B – MAY 2007 – REVISED JUNE 2008 ............................................................................................................................................................... www.ti.com
If EN2 goes high after the step down converter is already enabled, then the delay DLY2 starts when EN2 goes
high. See Figure 20.
Figure 20. Power-on Sequencing Using EN1 and EN2
Connecting an external capacitor to the DLY1 and DLY2 pin sets the delay time. If no delay time is required
these pins can be left open. To set the delay time the external capacitor connected to DLY1 and DLY2 is
charged with a constant current source of typically 5
A. The delay time is terminated when the capacitor voltage
has reached the internal reference voltage of VREF=1.280 V. The external delay capacitor is calculated using
where td = Desired delay time
Example for setting a delay time of 5.3 ms:
16
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65162
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