SC431 데이터 시트보기 (PDF) - Semtech Corporation
부품명
상세내역
일치하는 목록
SC431 Datasheet PDF : 9 Pages
| |||
SC431
Adjustable Shunt Regulator
POWER MANAGEMENT
Description
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 (VREF) to 30V with two external
resistors. The SC431 has a typical dynamic output
impedance of 0.25Ω. 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 = -40°C
A
to +85°C and 0.5% over TA = -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.
Features
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.
Applications
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drives
Typical Application Circuit(1)(2)
Notes:
1) Set VOUT according to the following equation:
VOUT
=
VREF
1 +
R1
R2
+
IREF
R1
2) Choose the value for R as follows:
• The maximum limit for R should be such that the
cathode current, IZ, is greater than the minimum
operating current (130µA) at VIN(MIN).
• The minimum limit for R should be such that IZ does
not exceed 150mA under all load conditions, and the
instantaneous turn-on value for IZ does not exceed
200mA. Both of the following conditions must be met:
Rmin
≥
VIN(max)
200mA
(to limit instantaneous turn-on IZ)
Rmin
≥
VIN(max) − VOUT
IOUT(min) +150mA
(to limit I under
Z
normal
operating conditions)
Revision: April 23, 2008
1
www.semtech.com
Share Link: 