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TDA7278 データシートの表示(PDF) - STMicroelectronics
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TDA7278
HIGH-EFFICIENCY CD ACTUATOR DRIVER
STMicroelectronics
TDA7278 Datasheet PDF : 15 Pages
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TDA7278
Figure 2:
Test Circuit
470pF
10
µ
F
10
µ
F
ST CAP 22
VREF (2) 38
VHIGH 11
VBAT
47
µ
H
10
OUT
AUXIL.
STEP UP
SYNC
23
OSCILL
VBAT
4
30
37 35
V bg
43
ER
+
-
VHIGH
VBAT
DRIV
5 FL IN 1
S
-
Q
R
+
VHIGH
DRIV
VHIGH
DRIV
100
µ
H
8 H IN 1
10
µ
F
7 H OUT 1A
9 H OUT 1B
FOCUS
ACTUATOR
FEEDBAKC
&
COMPENSATION
NETWORK
(see fig.4)
INP 13
IRC 14
STEP LP
or
STEP DOWN
STRUCTURE
(see fig.3)
2
µ
F
VCPU 15
OUT1 16
OUT2
17
SSCAP 12
VBG 18
100nF
24
ENABLE
VHIGH
DRIV
-
Vbg
+
VBAT
REFERENCE
Vbg
and
THERMAL
CRES 20
1
µ
F
19
RESET
CONTROL
Vbg
VBAT
21
WD INP
BEMP 41
BLOW
40
VCPU
39
VCON
Vbg/2
+
-
Vbg/2
+
-
VHIGH
VBAT
DRIV
29 FL IN 3
S
ER
-
Q
R
+
VHIGH
+
DRIV
-
VHIGH
DRIV
100
µ
H
26 H IN 3
10
µ
F
27 H OUT 3A
25 H OUT 3B
TRACKING
ACTUATOR
VHIGH
VBAT
DRIV
3 FL IN 2
S
ER
-
Q
R
+
VHIGH
+
DRIV
-
VHIGH
DRIV
100
µ
H
1 H IN 2
10
µ
F
2 H OUT 2A
44 H OUT 2B
M
SPINDLE
MOTOR
VHIGH
VBAT
DRIV
31 FL IN 4
S
ER
-
Q
R
+
VHIGH
+
DRIV
-
VHIGH
DRIV
100
µ
H
33 H IN 4
10
µ
F
32 H OUT 4A
34 H OUT 4B
M
SLEDGE
MOTOR
6
28 42
36
GND
D94AU111A
6/15
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