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TLVH431 Fiches technique(PDF) 21 Page - Texas Instruments

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No de pièce TLVH431
Description  LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
PDF  37 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TLVH431 Fiches technique(HTML) 21 Page - Texas Instruments

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APPLICATION INFORMATION
P
−
+
P
P
VCC
VFB
Current
Sense
Gate Drive
GND
Controller
P
P
P
P
TLVH431
VO
3.3 V
VI
120 V
∼
∼
TLVH431, TLVH431A, TLVH431B
TLVH432, TLVH432A, TLVH432B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS555F – NOVEMBER 2004 – REVISED OCTOBER 2005
Figure 18. Flyback With Isolation Using TLVH431 and TLVH432 as Voltage Reference and Error Amplifier
Figure 18 shows the TLVH431 used in a 3.3-V isolated flyback supply. Output voltage VO can be as low as
reference voltage VREF (1.24 V). 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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