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TL431 数据表(PDF) 27 Page - Texas Instruments

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部件名 TL431
功能描述  ADJUSTABLE PRECISION SHUNT REGULATORS
PDF  41 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

TL431 数据表(HTML) 27 Page - Texas Instruments

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TL431, TL431A, TL431B
TL432, TL432A, TL432B
ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS543H − AUGUST 2004 − REVISED JANUARY 2005
27
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
APPLICATION INFORMATION
TL431
VI(BATT)
R3
(see Note A)
R1A
R4
(see Note A)
R2B
R2A
NOTE A: R3 and R4 are selected to provide the desired LED intensity and cathode current
≥1 mA to the TL431 at the available VI(BATT).
R1B
Low Limit
+ 1 ) R1B
R2B
V
ref
High Limit
+ 1 ) R1A
R2A
V
ref
LED on When Low Limit < VI(BATT) < High Limit
Figure 26. Voltage Monitor
TL431
650
Ω
2 k
Ω
C
On
Off
R
12 V
Delay
+ R
C
In
12 V
12 V
* V
ref
Figure 27. Delay Timer
TL431
IO
RCL
0.1%
R1
VI(BATT)
I
out +
V
ref
R
CL
) I
KA
R1
+
V
I(BATT)
I
O
h
FE
) I
KA
Figure 28. Precision Current Limiter



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