參數(shù)資料
型號: TLE4254EJS
廠商: INFINEON TECHNOLOGIES AG
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝: GREEN, PLASTIC, MS-012BA, SOP-8
文件頁數(shù): 8/21頁
文件大小: 451K
代理商: TLE4254EJS
TLE4254
Application Information
Data Sheet
16
Rev. 1.2, 2009-11-18
Figure 6
Application circuit: Output voltage
V
Q lower than reference voltage VREF
Status Output feedbacked to microcontroller (version GS / EJ S)
In order to obtain a lower output voltage
V
Q at the tracker output than the reference voltage VREF, a voltage divider
feedbacked to microcontroller (version GS / EJ S) has to be used. The output voltage
V
Q then calculates:
With a given reference voltage
V
REF, the desired output voltage VQ and the resistor value R1ADJ, the resistor value
for
R2
ADJ is given by:
Taking into consideration also the effect of the internal EN/ADJ pull-down resistor, the external resistor divider’s
R2
ADJ has to be selected to:
EN/
ADJ
IQ
GND
TLE4254GS
TLE4254EJ S
8
5
1
micro controller
e.g.
C167,
XC16X
TC17xx
VDD
I/O
Main C supply
e.g.
TLE4271-2
TLE4471
TLE6368...
IQ
GND
VBAT
VQ < VREF
R1
ADJ
R2 ADJ
VREF
ST
4
2, 3, 6, 7
I/O
VQ
VREF
R2ADJ
R1ADJ R2ADJ
+
----------------------------------------
=
R2ADJ
R1ADJ
VQ
VREF VQ
---------------------------
=
R2ADJ select
,
R2ADJ RPullDown min
,
RPullDown min
,
R2ADJ
----------------------------------------------------------
=
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