TLVH431BILPE3 datasheet(22/53 Pages) TI1

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−

VCC

VFB

Current

Sense

Gate Drive

GND

Controller

TLVH431

3.3 V

120 V

∼

TLVH431, TLVH431A, TLVH431B

TLVH432, TLVH432A, TLVH432B

SLVS555I – NOVEMBER 2004 – REVISED SEPTEMBER 2009....................................................................................................................................... www.ti.com

APPLICATION INFORMATION

Figure 21. Flyback With Isolation Using TLVH431 and TLVH432 as Voltage Reference and Error Amplifier

Figure 21 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 21.

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Product Folder Link(s): TLVH431 TLVH431A TLVH431B TLVH432 TLVH432A TLVH432B

TLVH431BILPE3 Datasheet(PDF) 22 Page - Texas Instruments

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