AN1139 STMicroelectronics, AN1139 Datasheet - Page 51

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

Figure 35c. Mathcad Analisys of the Spindle Current Control Loop
CLOSE LOOP RESPONSE
CL( ) n
arg(
20 log(
.
CL( ) n
CL( ) n
)
1
.
360
. 2
H( ) n
. A H( ) n
)
180
120
120
180
60
60
50
40
30
20
10
0
10
20
30
40
50
0
10
10
100
100
MAGNITUDE RESPONSE in DB
PHASE RESPONSE in Degrees
1000
1000
f( ) n
f( ) n
1 10
1 10
4
4
AN1139 APPLICATION NOTE
1 10
5
1 10
5
1 10
6
0
1 10
6
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