TL431BQLP datasheet(30/83 Pages) TI

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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 7-16 and Figure 7-18.

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

TL432 - DBZ

(TOP VIEW)

REF

CATHODE

ANODE

Rsup

Rref

Vsup

Vin

GND

Figure 12-1. DBZ Layout Example

TL431, TL432

SLVS543Q – AUGUST 2004 – REVISED JULY 2022

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TL431BQLP 数据表(PDF) 30 Page - Texas Instruments