TL43xLIx

RS

0.1%

IO

VI(BATT)

I

O

V

ref

R

S

=

Copyright © 2017, Texas Instruments Incorporated

TL43xLIx

IO

RCL

0.1%

R1

VI(BATT)

Iout

V

ref

R

CL

I

KA

R1

V

I(BATT)

I

O

h

FE

I

KA

+

+

=

=

Copyright © 2017, Texas Instruments Incorporated

24

TL431LI

TL432LI

SLVSDQ6A – JULY 2018 – REVISED NOVEMBER 2018

www.ti.com

Product Folder Links: TL431LI TL432LI

Submit Documentation Feedback

Copyright © 2018, Texas Instruments Incorporated

System Examples (continued)

Figure 36. Precision Current Limiter

Figure 37. Precision Constant-Current Sink

11 Power Supply Recommendations

When using TL43xLI as a Linear Regulator to supply a load, designers typically use a bypass capacitor on the

output/cathode pin. When doing this, be sure that the capacitance is within the stability criteria shown in

Figure 12.

In order to not exceed the maximum cathode current, be sure that the supply voltage is current limited. Also, be

sure to limit the current being driven into the Ref pin, as not to exceed it's absolute maximum rating.

For applications shunting high currents, pay attention to the cathode and anode trace lengths, adjusting the width

of the traces to have the proper current density.

12 Layout

12.1 Layout Guidelines

Bypass capacitors should be placed as close to the part as possible. Current-carrying traces need to have widths

appropriate for the amount of current they are carrying; in the case of the TL43xLIx, these currents are low.