AUIRCS3040N

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June 17, 2015

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Application Information

A- Typical Applications

1- Single Phase Buck Converter

Figure 5 shows a typical application diagram in which the AUIRCS3040N is used as power stage of a

dramatically reduced component count implementation of the power stage. The digital controller provides

the input signals for both high and low side MOSFETs taking care of the needed dead time; a bootstrap

network (i.e. DB, RB and CBs) realizes the power supply for the higher voltage well of the gate driver that

is responsible for the High side MOSFET driving.

The VSS and COM pins are the signal and power grounds respectively; those two points have to be

connected together in a single point of the pcb to improve the signal integrity and, as a consequence, the

module driving.

CBs

RB

DB

Digital

Controller

COM

Cbp

VCC

HIN

LIN

VSS

VB

VS

VDCIN

COM

AUIRCS3040N

Rin

Rin

Vcc

L

Vout

Figure 5

2- Multiphase Buck Converter

Figure 6 shows another typical application diagram in which AUIRCS3040N is used as power stage in a

multiphase buck converter. For better understanding the bootstrap connection of AU-ConvertIR 2, 3 and

4 are not shown. This solution allows a better and more reliable system integration dramatically reducing

the component count

It is possible to easily evaluate the power managed by each phase in a specific application considering

that each AU-ConvertIR stage is able to manage up to 30A in a controlled thermal environment.

For instance this power is equal about to 400W in a typical 14V battery application. As a consequence,

converter in Fig. 6 with 4 phases can ideally manage up to 1.8kW.