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SC431_05 Datasheet

  • SC431_05

  • Adjustable Shunt Regulator

  • 226.11KB

  • 9頁

  • SEMTECH   SEMTECH

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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 (V
REF
) to 30V with two external
resistors. The SC431 has a typical dynamic output
impedance of 0.25鈩? 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
擄
C
to +85
擄
C and 0.5% over T
A
= -40
擄
C to +125
擄
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.
SC431
Features
Wide operating current range 130碌A(chǔ) to 150mA
Low dynamic output impedance 0.25
鈩?/div>
typ.
Trimmed bandgap design + 0.5%
Alternate for TL1431, TL431, LM431 & AS431
Industrial temperature range
Available in SOT-23-3 and SO-8 packages
Applications
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drives
Notes:
1) Set V
OUT
according to the following equation:
R1
錚?/div>
錚?/div>
V
OUT
=
V
REF
錚?/div>
1
+
錚?+
I
REF
R1
R2
錚?/div>
錚?/div>
Typical Application Circuit
(1)(2)
2) Choose the value for R as follows:
鈥?/div>
The maximum limit for R should be such that the
cathode current, I
Z
, is greater than the minimum
operating current (130碌A(chǔ)) at V
IN(MIN)
.
鈥?/div>
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:
R
min
鈮?/div>
V
IN(max)
200mA
(to limit instantaneous turn-on I
Z
)
R
min
鈮?/div>
I
OUT (min)
+
150mA
(to limit I
Z
under normal
V
IN(max)
鈭?/div>
V
OUT
operating conditions)
Revision: January 13, 2005
1
www.semtech.com

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