AN1451 datasheet(21/43 Pages) STMICROELECTRONICS

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AN1451 APPLICATION NOTE

2.13 Power Management

Even when operating at current levels well below the maximum ratings of the device, the operating junction tem-

perature must be kept below 125 °C.

Figure 21 shows the IC dissipated power versus the r.m.s. load current, in 4 different driving sequences, assum-

ing the supply voltage is 24V.

Figure 21. IC Dissipated Power versus Output Current.

No PWM

= 30 kHz (slow decay)

Test Conditions:

Supply Voltage = 24V

I A

I B

IOUT

0.5

1.5

2.5

PD [W]

I OUT [A]

HALF STEP

No PWM

fSW = 30 kHz (slow decay)

Test Conditions:

Supply Volt age =24 V

I A

I B

IOUT

00.5

11.5

22.5

PD [W ]

I OUT [A ]

NORM AL DRIVE

fSW = 50 k

Hz (slow decay)

fSW = 30 k

Hz (slow decay)

I A

I B

IOUT

MICROSTEPPING

0.5

1.5

2.5

PD [W]

I OUT [A]

Test Conditions:

Supply Voltage = 24V

No PW M

fSW = 3 0 kHz (slow decay)

Test Conditions:

Supply Voltage = 24V

I A

I B

IOUT

WAVE DRIVE

0.5

1.5

2.5

PD [W]

I OUT [A]

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