TL431CDBVR datasheet(29/77 Pages) TI1

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TL432 - DBZ

(TOP VIEW)

REF

CATHODE

ANODE

Rsup

Rref

Vsup

Vin

GND

TL431

0.1%

VI(BATT)

ref

TL431, TL431A, TL431B

TL432, TL432A, TL432B

www.ti.com

SLVS543O – AUGUST 2004 – REVISED JANUARY 2015

System Examples (continued)

Figure 39. Precision Constant-Current Sink

11 Power Supply Recommendations

When using TL43xx as a Linear Regulator to supply a load, designers will 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 16 and Figure 18.

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 TL43xx, these currents will be low.

12.2 Layout Example

Figure 40. DBZ Layout example

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TL431CDBVR Datasheet(PDF) 29 Page - Texas Instruments