A7431MP8VR datasheet(10/15 Pages) AITSEMI

10 / 15 page

AiT Semiconductor Inc.

www.ait-ic.com

A7431

DC-DC CONVERTER BUCK (STEP-DOWN)

42V 3A CC/CV

REV1.1

- JAN 2016 RELEASED, SEP 2016 UPDATED -

- 10 -

Rectifier Diode

Use a Schottky diode as the rectifier to conduct current when the High-Side Power Switch is off. The Schottky

diode must have current rating higher than the maximum output current and a reverse voltage rating higher

than the maximum input voltage.

STABILITY COMPENSATION

Figure 5: Stability Compensation

CCOMP2 is needed only for high ESR output capacitor The feedback loop of the IC is stabilized by the

components at the COMP pin, as shown in Figure 5.

The DC loop gain of the system is determined by the following equation:

AVDC =

OUT

0.808V A

VEA

GCOMP

The dominant pole P1 is due to CCOMP:

∫P1 =

COMP

VEA

The second pole P2 is the output pole:

∫P2 =

OUT

The first zero Z1 is due to RCOMP and CCOMP:

∫Z1 =

COMP

And finally, the third pole is due to RCOMP and CCOMP2 (if CCOMP2 is used):

∫P3 =

COMP

A7431MP8VR Datasheet(PDF) 10 Page - AiT Semiconductor Inc.