Test setup and performance summary

AN2565

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Figure 13.

OUT1 efficiency

Figure 14.

OUT2 efficiency

10.5

Power consumption analysis

To measure the device consumption under real working conditions, an external power

supply of +5 V is connected to EXT5V.

The two traces on figures that follow show the differentiation between the two input currents.

Once the internal linear regulator is turned on, device consumption will increase as a

consequence.

the input device current consumption measured at the VCC pin. Both switching sections are

working in forced PWM mode. No load is applied on the outputs.

OUT1=3.3V Efficiency

0

10

20

30

40

50

60

70

80

90

100

0.001

0.010

0.100

1.000

10.000

Load current [A]

SKIP @ 12V

SKIP @ 24V

SKIP @ 32V

NO AUD. SKIP @ 12V

NO AUD. SKIP @ 24V

NO AUD. SKIP @ 32V

PWM @ 12V

PWM @ 24V

PWM @ 32V

OUT2=1.8V Efficiency

0

10

20

30

40

50

60

70

80

90

100

0.001

0.010

0.100

1.000

10.000

Load current [A]

SKIP @ 12V

SKIP @ 24V

SKIP @ 32V

NO AUD. SKIP @ 12V

NO AUD. SKIP @ 24V

NO AUD. SKIP @ 32V

PWM @ 12V

PWM @ 24V

PWM @ 32V