www.ti.com

APPLICATION INFORMATION

P

−

+

P

P

Current

Sense

Gate Drive

GND

Controller

P

P

P

P

TLVH431

3.3 V

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

(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.

21