L6726ATR datasheet(27/35 Pages) STMICROELECTRONICS

27 / 35 page

L6726A

20 A demonstration board

Doc ID 12754 Rev 4

27/35

10.1

Board description

10.1.1

Power input (VIN)

This is the input voltage for the power conversion. The high-side MOSFET drain is

connected to this input. Supply must be compliant with VIN recommended operating

conditions and capacitors rating.

If VIN voltage is compliant also to VCC range listed in recommended operating conditions, it

can supply also the device through R16 resistor.

10.1.2

Power output (VOUT)

This is the output voltage of the power conversion. The output voltage is programmed to

1.25 V. It can be changed by replacing R13 (adjusting of compensation network may be

needed). R18 allows to adjust OCP threshold.

10.1.3

IC additional supply (VCC)

The controller can be supplied separately from the power conversion through VCC input. In

this case, to separate VCC from VIN, R16 resistor must be removed.

10.1.4

Test points

The following test points are provided to allow easy probing of important signals:

–

COMP: Output of the error amplifier;

–

FB: Inverting input of the error amplifier;

–

PH: Phase pin of the device;

–

LG: Low-side gate pin of the device;

–

UG: High-side gate pin of the device.

10.1.5

Demonstration board efficiency

Figure 17.

20 A demonstration board efficiency

100

Output Current [A]

Vin=12V, Vout=1.25V

Vin=5V, Vout=1.25V

Vin=12V, Vout=2.5V

Vin=5V, Vout=2.5V

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