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參數(shù)資料
| 型號： | FAN8621B |
| 英文描述： | Industrial Control IC |
| 中文描述： | 工業(yè)控制IC |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 222K |
| 代理商： | FAN8621B |
FAN8621B
16
VCM Retract
Power fail condition or when VCM retract command is issued on CNTL3 (pin46) LOW, retract circuit is activated. The retract
current is limited by internal and external resistor connected RRET (pin24) and retract delay time is adjusted by external
capacitor connected CRET (pin 17). The voltage on CRET2 (pin21) charged by spindle back-EMF serves as retract power.
Figure 7. Retract Function Block
Retract delay time and maximum retract current is defined as follows;
Power Management
Supplies Monitoring and Reference
The voltage reference circuit generates precision 1.3V volt reference, other voltage and current reference. Precision low volt-
age monitor circuitry senses 5V, 12V supplies. These supplies are individually divided down by resistor divider and then com-
pared with internal 2.5V reference to determine the set-point low voltage condition. Low voltage condition can be changed by
adding external resistor on SENSE5 (pin4), SENSE12 (42).
Power On Reset (POR)
When low voltage is detected, POR (pin10) is lowered immediately and fed to external controller. The retract and braking
sequence is started. If low voltage condition is removed, the POR becomes high with delay. This time delay is based on charg-
ing of the CDLY (pin11) capacitor with internal current source.
bandgap
reference
37
34
32
17
24
27
20
21
I
cret
12u
R
iret
3k
I
rct=
300 Iret
I
ret
1.3V
2.0V
TSD
por
retract
C17
R24
C21
22
D21
T
retdly
C17
I
cret
-----------
=
I
rct max
)
300 I
ret
300
+
3K
R24
------------------------
=
=
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