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TL431LI Datasheet(Fiches technique) 1 Page - Texas Instruments

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Numéro de pièce TL431LI
Description  Programmable Shunt Regulator with Optimized Reference Current
Télécharger  32 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to
change without notice.
TL431LI
TL432LI
SLVSDQ6 – JULY 2018
TL43xLIx Programmable Shunt Regulator with Optimized Reference Current
1
1 Features
1
Reference Voltage Tolerance at 25°C
0.5% (B Grade)
1% (A Grade)
Minimum Typical Output Voltage: 2.495 V
Adjustable Output Voltage: Vref to 36 V
Operation From
−40°C to +125°C
Maximum Temperature Drift (TL431LIB)
34 mV
Low Output Noise
0.3-Ω Typical Output Impedance
Sink-Current Capability
Imin = 1 mA (max)
IKA = 15 mA (max)
Reference Input Current IREF: 0.8 μA (max)
Deviation of Reference Input Current over
Temperature, II(dev): 0.4 μA (max)
2 Applications
Adjustable Voltage and Current Referencing
Secondary Side Regulation in Flyback SMPS
Zener Diode Replacement
Voltage Monitoring
Precision Constant Current Sink/Source
Comparator with Integrated Reference
3 Description
The TL431LI device is a three-terminal adjustable
shunt regulator, with specified thermal stability over
applicable
automotive,
commercial,
and
military
temperature ranges. The output voltage can be set to
any value between Vref (approximately 2.495 V) and
36 V, with two external resistors. These devices have
a typical output impedance of 0.3 Ω. Active output
circuitry provides a very sharp turn-on characteristic,
making these devices excellent replacements for
Zener diodes in many applications, such as onboard
regulation, adjustable power supplies, and switching
power supplies. This device is a pin-to-pin alternative
to the industry standard TL431, with optimized Iref and
IIdev performance. The lower Iref and IIdev values
enable designers to achieve higher system accuracy
and lower leakage current. The TL432LI device has
exactly
the
same
functionality
and
electrical
specifications as the TL431LI device, but has a
different pinout for the DBZ package.
The TL431LI device is offered in two grades, with
initial tolerances (at 25°C) of 0.5% and 1%, for the B
and A grade, respectively. In addition, low output drift
versus temperature ensures good stability over the
entire temperature range.
The
TL43xLIxQ
devices
are
characterized
for
operation from –40°C to 125°C.
Device Information(1)
PART NUMBER
PACKAGE (PIN)
BODY SIZE (NOM)
TL43xLIx
SOT-23 (3)
2.90 mm x 1.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic




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