TLV431
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TLV431
3.3 V
Secondary side
regulated supply
Primary side
controller
R3
I
F
R1
R2
TLV431
GND
Optocoupler
5 ANODE
N/C 1
CATHODE 3
N/C‡ 2
4 REF
3 ANODE
REF 1
CATHODE 2
6 ANODE
CATHODE 1
REF 3
N/C‡ 2
4 NC
5 NC‡
A Product Line of
Diodes Incorporated
1.24V COST EFFECTIVE SHUNT REGULATOR
Description
The TLV431 is a three terminal adjustable shunt regulator offering
excellent temperature stability and output current handling capability
up to 20mA. The output voltage may be set to any chosen voltage
between 1.24 and 18 volts by selection of two external divider
resistors.
The TLV431 can be used as a replacem ent for zener diodes i n m any
applications requiring an improvement in zener performance.
The TLV431 is available in 3 grades with initial tolerances of 1%,
0.5%, and 0.2% for the A, B and T grades respectively.
Pin Assignments
TLV431_H6 (SC70-6 [SOT363])
TLV431_F (SOT23)
(Top View)
Features
• Low Voltage Operation V
• Temperature range -40 to +125°C
• Reference Voltage Tolerance at +25°C
0.2% TLV431T
0.5% TLV431B
1% TLV431A
• Typical temperature drift
4 mV (0°C to +70°C)
6 mV (-40°C to +85°C)
11mV (-40°C to +125°C)
• 80µA Minimum cathode current
• 0.25Ω Typical Output Impedance
• Adjustable Output Voltage V
• Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
• Qualified to AEC-Q100
Typical Application Circuit
= 1.24V
REF
REF
to 18V
(Top View)
TLV431_E5 (SOT25)
(Top View)
‡ Pin should be left floating or connect to anode
Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Document number: DS32088 Rev. 6 - 2
October 2012
www.diodes.com
© Diodes Incorporated
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