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參數(shù)資料
| 型號(hào)： | FAN8623 |
| 英文描述： | Servo/Spindle Motor Controller/Driver |
| 中文描述： | 伺服/主軸電機(jī)控制器/驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大小： | 222K |
| 代理商： | FAN8623 |
FAN8621B
11
Application Informations
General
The FAN8621B is a stand alone combination chip consisting of Spindle Motor (SPM) and Voice Coil Motor (VCM)circuit for
HDD applications. The speed control of SPM is achieved by internal Synchronous Phase Locked Loop (SPLL). The
FAN8621B supplies adjustable regulated power with external component and signals READY indicating SPM is locked
within some speed range (typically ±0.7% speed error). Current set point is applied by two PWM signals and VCM current is
monitored by external sense resistor. VCM circuit generates 4 voltage references for testing. Fig.1 shows overall interfacing of
FAN8621B with external and HDD motors
Figure 1. Overall Interfacing of the FAN8621B
The control signals have three status and their function is summarized as follows;
Table 1. Control PIN function
Notes:
1. SPM bias + SPM Output Driver enable
2. Makes SPM Open Loop (Start-up) Commutation Signal
3. Test Only when READY is low
Pin Status
Signals
CNTL1
H
Z
L
SPM
Brake
enable
(1)
disable
hard
high
(2)
enable
disable
normal
2
bias enable
disable
Hard
low
(2)
disable
disable
normal
2
disable
enable
soft
-
disable
enable
hold
(3)
8
CNTL2
Commutation
Start Clock
VCM
Retract
Start-up hold
Sense Amp gain
CNTL3
GAINSEL
Power
Management
SPM
VCM
Retract/Brake
DIGITAL
ASIC
Interface
POR
Vreg3.3
CNTL1
PWMH
PWML
GAINSEL
READY
FG
VCMREF4V
RPMSEL
TSD
CLK
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