TA76432AFT/AF/AFR/AS

2006-11-07

4

Recommended Operating Conditions

Characteristics

Symbol

Min

Typ.

Max

Unit

Cathode voltage

⎯

19

V

Cathode current

0.5

⎯

15

mA

Operating temperature

−40

⎯

85

°C

Electrical Characteristics

(Unless otherwise specified, Ta

Characteristics

Symbol

Test Condition

Min

Typ.

Max

Unit

Reference voltage

1.247

1.26

1.273

V

Deviation of reference input voltage

over temperature

⎯

3

15

mV

⎯

0.5

2.5

Ratio of change in reference input

voltage to the change in cathode

voltage

⎯

0.3

2.0

mV/V

Reference input current

⎯

2

4

μA

Deviation of reference input current

over temperature

⎯

0.3

1.2

μA

Minimum cathode current for

regulation

⎯

0.2

0.5

mA

Off-state cathode current

⎯

⎯

1.0

μA

Dynamic impedance

⎯

0.2

0.5

Ω

rated temperature range.

Application Circuit Example

Error amplification circuit for switching power supply

This circuit amplifies the difference between the switching power supply’s secondary output voltage and the shunt

regulator’s reference voltage. It then feeds the amplified voltage back to the primary input voltage via the

photocoupler.

()

C

ppm

Ta

C

@25

V

10

V

V

REF

6

(dev)

REF

REF

°

Δ

⎟⎟

⎟

⎠

⎞

⎜⎜

⎜

⎝

⎛

°

×

=

α

min

max

ΔTa

Photo-

coupler

GND

Shunt regulator