Datasheet > L431L

L431L

更新时间： 2024-10-03 05:41:15

品牌	Logo	应用领域
其他 - ETC		稳压器
页数	文件大小	规格书
11页	564K
描述
1.24V Low-Voltage Adjustable Precision Shunt Regulator

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L431L 数据手册

1.24V Low-Voltage Adjustable

Precision Shunt Regulator

NIKO-SEM

L431L

GENERAL DESCRIPTION

FEATURES

The L431L is a three-terminal adjustable shunt

regulator utilizing an accurate 1.24V band gap

reference. The output voltage can be set to any

value between 1.24V (V_REF) to 18V with two

external resistors as shown in the typical

application circuit. The device exhibit a wide

operating current range of 0.2 to 100 mA with a

typical dynamic impedance of 0.25Ω. Active

output circuitry provides a very sharp turn-on

characteristic, making the L431L excellent re-

placements for low-voltage zener diodes in

many applications, including on-board regulat-

ion and adjustable power supplies.

z Internal amplifier with 100 mA capability

z Programmable output voltage to 18V

z 0.25Ω typical output impedance

z Pin to pin compatible with TLV431A,

TS431, SC431L & AS432

z Trimmed bandgap design 0.5% & 1.0%

with three package options

z Low output noise

APPLICATIONS

z Linear regulator controller

z Precision voltage reference

z Switching power supplies

z Battery operating equipment

z Instrumentation

When used with an opto-coupler, the L431L is

ideal voltage reference in isolated feedback

circuits for 3.3V switching-mode power supplies.

The L431L shunt regulator is available in two

voltage tolerances (0.5% & 1.0%) and three

package options (TO-92, SOT-23-3 and SO-8).

z PCs, Computer disk drives

SYMBOL & BLOCK DIAGRAM

Reference

Cathod

Cathode (K)

(R)

(K)

Reference (R)

1.24 Vref

Anode (A)

SYMBOL

FUNCTIONAL BLOCK DIAGRAM

APR-25-2002

12 3 4 5 6 7...11

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