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TLV431 Datasheet(PDF) 18 Page - Texas Instruments

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Part # TLV431
Description  LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
PDF  34 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLV431 Datasheet(HTML) 18 Page - Texas Instruments

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TLV431, TLV431A, TLV431B
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139R − JULY 1996 − REVISED SEPTEMBER 2005
18
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
APPLICATION INFORMATION
~
~
P
−
+
P
P
VCC
VFB
Current
Sense
Gate Drive
GND
Controller
P
P
PP
TLV431
or
TLV431A
or
TLV431B
VO
3.3 V
VI
120 V
Figure 18. Flyback With Isolation Using TLV431, TLV431A, or TLV431B
as Voltage Reference and Error Amplifier
Figure 18 shows the TLV431, TLV431A, or TLV431B used in a 3.3-V isolated flyback supply. Output voltage VO
can be as low as reference voltage VREF (1.24 V ± 1%). The output of the regulator, plus the forward voltage
drop of the optocoupler LED (1.24 + 1.4 = 2.64 V), determine the minimum voltage that can be regulated in an
isolated supply configuration. Regulated voltage as low as 2.7 Vdc is possible in the topology shown in
Figure 18.



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