TL431 Datasheet, PDF (11/12 Pages) Motorola, Inc – PROGRAMMABLE PRECISION REFERENCES

PRODUCT DATABOOK 1996/1997
TL431/TL431A/TL431B
PRECISION PROGRAMMABLE REFERENCES
PRODUCTION DATA SHEET
V_BATT
R (see Note)
R1 0.1%
V_REF
R2 0.1%
APPLICATION INFORMATION
V_O
I_K
TL431/A
& TL431B
V_BATT
TL431/A
& TL431B
Input
V_O
V_ON » 2V
V_OFF » V_BATT
V_O = ^1 +
R1 
R2 ^
* ^V_REF
Note: R should provide ≥ 1mA cathode current to
the TL431/A & TL1431 at minimum V_BATT.
FIGURE 16 — SHUNT REGULATOR
GND
FIGURE 17 — SINGLE-SUPPLY COMPARATOR WITH
TEMPERATURE-COMPENSATED THRESHOLD
V_BATT
V_O
R1
R2
TL431/A
& TL431B
V_O = ^1 +
R1 
R2 
* ^V_REF
FIGURE 18 — HIGH CURRENT SHUNT REGULATOR
V_BATT
R1
TL431/A
& TL431B
R2
V_O
C
(see Note)
Note: Refer to the stability boundary conditions in
Figure 15 to determine allowable values for C.
FIGURE 19 — CROWBAR CIRCUIT
Copyright © 1999
Rev. 1.3 9/99
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