AN1139 STMicroelectronics, AN1139 Datasheet - Page 50

• Manufacturer Part Number: AN1139
• Description: L6254 - L6268 - L6269 12V DISK DRIVE POWER COMBO IC
• Manufacturer: STMicroelectronics

AN1139 APPLICATION NOTE
Figure 35b. Mathcad Analisys of the Spindle Current Control Loop
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OPEN LOOP RESPONSE
arg(
20 log(
.
H( ) n
H( ) n
)
H( ) n
.
360
. 2
H1( ) n H2( ) n
)
180
140
100
100
140
180
60
20
20
60
50
40
30
20
10
10
20
30
40
50
0
10
10
.
100
100
H( ) 0
MAGNITUDE RESPONSE in DB
PHASE RESPONSE in Degrees
=
584.28
1000
1000
f( ) n
f( ) n
1 10
1 10
4
4
1 10
1 10
5
5
1 10
1 10
6
6
0