SC431CS-2.TR datasheet(1/9 Pages) SEMTECH

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POWER MANAGEMENT

1

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SC431

Adjustable Shunt Regulator

Revision: April 23, 2008

The SC431 is a three terminal adjustable shunt

regulator with thermal stability guaranteed over

temperature. The output voltage can be adjusted to any

value from 2.5V (V

REF) to 30V with two external

resistors. The SC431 has a typical dynamic output

impedance of 0.25

Ω. Active output circuitry provides a

very sharp turn on characteristic, making the SC431 an

excellent replacement for zener diodes.

The SC431 shunt regulator is available with four

voltage tolerances (0.5%, 1.0% and 2.0% over T

A = -40°C

to +85°C and 0.5% over T

A = -40°C to +125°C) and two

package options (SOT-23-3 and SO-8). This

allows the designer the opportunity to select the

optimum combination of cost and performance for their

application.

Linear Regulators

Adjustable Supplies

Switching Power Supplies

Battery Operated Computers

Instrumentation

Computer Disk Drives

Wide operating current range 130µA to 150mA

Low dynamic output impedance 0.25

Ω typ.

Trimmed bandgap design + 0.5%

Alternate for TL1431, TL431, LM431 & AS431

Industrial temperature range

Available in SOT-23-3 and SO-8 packages.

Also available in Lead-free, fully WEEE and RoHS

compliant.

Notes:

1) Set V

OUT according to the following equation:

1

R

I

2

R

1

R

1

V

REF

OUT

+











 +

=

2) Choose the value for R as follows:

• The maximum limit for R should be such that the

cathode current, I

Z, is greater than the minimum

operating current (130µA) at V

IN(MIN).

• The minimum limit for R should be such that I

Z does

not exceed 150mA under all load conditions, and the

instantaneous turn-on value for I

Z does not exceed

200mA. Both of the following conditions must be met:

mA

200

V

R

(max)

IN

min ≥

(to limit instantaneous turn-on I

Z)

mA

150

I

V

R

(min)

OUT

(max)

IN

min

+

−

≥

(to limit I

Z under normal

operating conditions)

Applications

Typical Application Circuit(1)(2)

Features

Description

Số phần tương tự - SC431CS-2.TR

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Semtech Corporation	SC431CS-2	111Kb / 6P	ADJUSTABLE SHUNT REGULATOR

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