TL431/TL431A/TL431B

PRODUCT DA T ABOOK 1996/1997

Copyright © 1999

Rev. 1.3

9/99

12

APPLICA TION INFORMA TION

R1A

R2A

12V

(Note)

R2B

R3 (see Note)

R4

TL431/A

& TL431B

R1B

R2B

Low Limit = 1 +





R1B

R2B

High Limit = 1 +





Note: R3 and R4 are selected to provide the desired LED intensity and

≥ 1mA

cathode current to the TL431/A & TL431B at the available V+.

FIGURE 20 — VOLTAGE MONITOR

FIGURE 21 — PRECISION CONTANT-CURRENT SINK

LED On when

Low Limit < V





V

REF

R

S

I

R

S

0.1%

V

BATT

I

O

TL431/A

& TL431B

PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document

may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of

all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.