TL431Z Datasheet, PDF (14/15 Pages) List of Unclassifed Manufacturers – PROGRAMMABLE PRECISION SHUNT REGULATOR

PROGRAMMABLE PRECISION SHUNT REGULATOR TL431Z/AZ /CZ
APPLICATION INFORMATION
V_I(BATT)
R3
(SEE NOTE A)
R1A
R1B
TL431
OUT
R4
(SEE NOTE A)
R2A
R2B
LOW LIMIT=
（1+
R1B
R2B
）
V_REF
HIGH LIMIT=
（1+
R1A
R2A
）V_REF
LED ON WHEN LOW LIMIT＜<V_I(BATT＜₎ HIGH LIMIT
NOTE A : R3 and R4 are selected to provide the desired LED intensity and cathode current ≥1㎃
to the TL431 at the available V_I(BATT).
Figure 24. Voltage Monitor
650Ω
12V
R
2㏀
TL431
ON
C
OFF
DELAY=RxCxI_N
(
12V
12V-V_REF
）
V_I(BATT)
Figure 25. Delay Timer
R_CL
I_O
0.1%
I_OUT =
V_REF
R_CL
+ I_KA
R1
TL431
R1 =
V_I(BATT)
I_O
H_FE
+ I_KA
Figure 26. Precision Current Limiter
Jan. 2007 - Rev 1.0
14
HTC