Data Sheet AS8446

Revision 1.8, Date 2005-03-17

Page 12 of 35

Falling edge (switch off): Programmable Gate Drive Sink Currents (10 bit)

Register / timing

part of falling edge

Programmable range

Programmable range

Unit

Note

R6<1> = 1, Acu_on/off

R6<1> = 0, Acu_on/off

min

max

step

min

max

step

R4<4:0> = SRoff

0

496

16

0

248

8

mA

R4<4:0>, SRoff

0

40

0

20

mA

R4 = 0, 1, 2, … 31

R5<3:0>, SRoff_stat

1.0

32

1.0

5

80

5

mA

R2 = 0, 1, 2, … 15

Note (1):

Table 12

Programming of the slew rate parameters (falling edge)

Figure 6

Falling edge of the motor voltage before and after the EMC optimization

-10

0

10

20

30

40

50

60

70

80

0.1

1

10

100

1000

[MHz]

DUT:

Demo board AS8444_TC

Conditions:

Load : Ri = 0.4 Ohm, Li = 0.063 mH

EMC parameter set 1 (not EMC optimized)

EMC parameter set 2 (EMC optimized)

IBEE

Ingenieurbüro für industrielle Elektrotechnik/ Elektronik

Prof. Dr.-Ing. habil. D. Sperling

Conducted Emission power supply lines according CISPR 25

Detector:

Peak

EMC parameter set 1

(not EMC optimized)

EMC parameter set 2

(EMC optimized)

Figure 7

Comparison of the EMC measurement results of the same application with two different EMC parameter sets