ADJUSTABLE PRECISION SHUNT REGULATOR

2007-1-24

3/15

FSP431

ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Reference Voltage

2.47

2.495

2.52

V

Deviation of reference voltage

over full temperature range

(see Figure 1)

4

25

mV

-4.7

-2.7

Ratio of change in reference

voltage to the change in cathode

voltage

-1

-2

mV/V

Reference Current

2

4

µA

Deviation of reference current

over full temperature range

(see Figure 1)

0.8

1.2

µA

Minimum Cathode Current for

regulation

0.4

0.6

mA

Off-state Cathode Current

0.1

0.5

mA

Dynamic Impedance

(see Figure 1)

∣

f≤1kHz

0.2

0.5

Ω

values obtained over the recommended temperature range. The average full-range temperature coefficient of the

Where :

∆TA is the recommended operating free-air temperature range of the device.

α

Vref can be positive or negative, depending on whether minimum Vref or maximum Vref, respectively , occurs at

the lower temperature.

Example : maximum Vref=2.496V at 30°C, minimum Vref =2.492V at 0°C, Vref=2.495V at 25°C,

Because minimum Vref occurs at the lower temperature, the coefficient is positive.

Calculating Dynamic Impedance

The dynamic impedance is defined as:

When the device is operating with two external resistors, the total dynamic impedance of the circuit is given by:

Figure 1: Calculating Deviation Parameters and Dynamic Impedance