LM4030 datasheet(10/20 Pages) TI

10 / 20 page

VHYS =

lVREF1 - VREF2l

VREF

x 10

6 ppm

-40

VREF1

Time

VREF2

125

LM4030

SNVS552B – MARCH 2008 – REVISED APRIL 2013

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Figure 23. Reverse Dynamic Impedance vs COUT

As with other regulators, an external capacitor reduces the amplitude of the VREF transient when a sudden

change in loading takes place. The capacitor should be placed as close to the part as possible to reduce the

effects of unwanted board parasitics.

THERMAL HYSTERESIS

Thermal hysteresis is the defined as the change in output voltage at 25°C after some deviation from 25°C. This

is to say that thermal hysteresis is the difference in output voltage between two points in a given temperature

profile. An illustrative temperature profile is shown in Figure 24.

Figure 24. Illustrative Temperature Profile

This may be expressed analytically as the following:

where

•

VHYS = Thermal hysteresis expressed in ppm

•

VREF = Nominal preset output voltage

•

VREF1 = VREF before temperature fluctuation

•

VREF2 = VREF after temperature fluctuation

(2)

The LM4030 features a low thermal hysteresis of 75 ppm (typical) from -40°C to 125°C after 8 temperature

cycles.

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LM4030 Datasheet(PDF) 10 Page - Texas Instruments