參數(shù)資料
型號(hào)： KA3021DTF
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 光電元器件
英文描述： 4-Channel Motor Driver
中文描述： CD MOTOR DRIVER, PDSO28
封裝： 0.375 INCH, HEAT SINK, SSOP-28
文件頁(yè)數(shù)： 9/12頁(yè)
文件大?。?/td> 194K
代理商： KA3021DTF
KA3021D
9
3. FOCUS, TRACKING ACTUATOR, SLED MOTOR DRIVE PART
The reference voltage REF is given externally through pin 23.
The input signal,pin3,20.25 is amplified by R2 / R1 times and then fed to the level shift circuit.
The level shift circuit produces the differential output voltages and drives the two output power amplifiers. Since the
differential gain of the output amplifiers is equal to 2
×
(1+ R4 / R3), input signal is amplified by (R2 / R1)
×
2
×
(1 + R4 /
R3).
If the total gain is insufficient, the external resistors can be used through pin 4, 24 to increase the gain.
The bias voltage (Vref) is about a half of the supply voltage(VM).
4. TRAY MOTOR DRIVE PART
+
+
+
+
M
23
4
3
Vref
R1
AP1
R2
+
LEVEL
SHIFT
R3
Vr
R3
AP2
AP3
R4
R4
Power amp
20 25
24
M
12
13
19
16
15
DO2+
DO2
D
LEVEL SHIFT
M.S.C
S.W
D
CTL
IN
FWD
REV
IN
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