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TDA7278 の電気的特性と機能

TDA7278のメーカーはST Microelectronicsです、この部品の機能は「HIGH-EFFICIENCY CD ACTUATOR DRIVER」です。


製品の詳細 ( Datasheet PDF )

部品番号 TDA7278
部品説明 HIGH-EFFICIENCY CD ACTUATOR DRIVER
メーカ ST Microelectronics
ロゴ ST Microelectronics ロゴ 




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TDA7278 Datasheet, TDA7278 PDF,ピン配置, 機能
TDA7278
HIGH-EFFICIENCY CD ACTUATOR DRIVER
WIDE OPERATIVE SUPPLY RANGE (1.6 to
5V) LOW VOLTAGE OPERATION CAPABIL-
ITY
4 LOAD DRIVING VOLTAGES PWM REGU-
LATED (STEP DOWN FROM BATTERY)
LOW ON RESISTANCE H BRIDGES
(2 x 1.6MAX + 2 x 2.5MAX) FOR:
– FOCUS AND TRACKING ACTUATORS
– SLEDGE AND SPINDLE MOTORS
SYNCHRONIZABLE SAWTOOTH OSCILLATOR
CONFIGURABLE DC/DC CONVERTER FOR
ADJUSTABLE MAIN POWER SUPPLY, WITH
LOW ON RESISTANCE (0.4MAX) SWITCH
GENERAL ENABLE INPUT
ADJUSTABLE WATCH DOG AND DELAYED
POWER ON RESET FUNCTIONS
PIN CONNECTION
PQFP44
ADJUSTABLE COMPARATORS FOR BAT-
TERY LOW AND BATTERY EMPTY DETEC-
TION
44 43 42 41 40 39 38 37 36 35 34
H IN 2
H OUT 2A
FLIN 2
VBAT
FLIN 1
GND
H OUT 1A
H IN 1
H OUT 1B
OUT
VHIGH
1
2
3
4
5
6
7
8
9
10
11
33 H IN 4
32 H OUT 4A
31 FLIN 4
30 VBAT
29 FLIN 3
28 GND
27 H OUT 3A
26 H IN 3
25 H OUT 3B
24 ENABLE
23 SYNC
12 13 14 15 16 17 18 19 20 21 22
March 1997
D94AU112A
1/15

1 Page





TDA7278 pdf, ピン配列
PIN FUNCTIONS
No Name
21 WDINP
20 CRES
19 RESET
41 BEMP
40 BLOW
39 VCON
24
18
12
16
17
15
14
13
11
10
22
23
4, 30
6, 28
38
37
5
7
8
9
43
29
27
26
25
35
3
2
1
44
42
ENABLE
VBG
SSCAP
OUT 1
OUT 2
VCPU
IRC
INP
VHIGH
OUT
STCAP
SYNC
VBAT
GND
VREF 2
VREF 1
FLIN 1
HOUT 1A
HIN 1
HOUT 1B
ERROR 1
FLIN 3
HOUT 3A
HIN 3
HOUT 3B
ERROR 3
FLIN 2
HOUT2A
HIN 2
HOUT 2B
ERROR 2
Function
Watch dog input - AC coupled to WD µcontroller output
(Disabled when connected to GND)
Start up reset control for µC & watch dog time constant
Reset output command to µC (open collector)
Battery empty comparator input
Battery low comparator input
Battery level control output
VCON = Z VBEMP > VBCON > VBG
VCON = 1 VBEMP > VBG > VBLOW
VCON = 0 VBG > VBEMP > VBLOW
General Enable Input (active Low)
Reference voltage capacitor
Soft start capacitor
Switching transistor terminal high
Switching transistor terminal low
Regulated voltage
Error amplifier output
Error amplifier inverting input
Regulated Voltage
Switching transistor output
Sawtooth toth
Oscillator synchronizing input
Power supply voltage
Power ground
Buffered reference output voltage
Reference input voltage
Switching Output
H bridge positive output
Regulated voltage H bridge supply
H bridge negative output
Error input
Switching Output
H bridge positive output
Regulated voltage H bridge supply
H bridge negative output
Error input
Switching output
H bridge positive output
Regulated voltage H bridge supply
H bridge negative output
Error input
TDA7278
Watch dog & reset
circuit
Battery control circuit
Band Gap Reference
VCPU DC-DC
converter
Vhigh Boost DC-DC
Converter
Oscillator
Focus actuator step
down converter
& H bridge
Tracking actuator
step down converter
& H bridge
Spindle motor step
down converter
& H bridge
3/15


3Pages


TDA7278 電子部品, 半導体
TDA7278
Figure 2: Test Circuit
470pF
10µF
10µF
ST CAP 22
VREF (2) 38
VHIGH
VBAT
11
47µH
OUT
10
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
100µH
8 H IN 1
10µF
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)
2µF
VCPU 15
OUT1 16
OUT2
17
SSCAP 12
VBG 18
100nF
ENABLE
24
VHIGH
DRIV
-
Vbg
+
VBAT
REFERENCE
and
THERMAL
Vbg
CRES 20
1µF
19
RESET
VBAT
21
WD INP
BEMP 41
CONTROL
Vbg
BLOW
40
VCPU
39
VCON
Vbg/2
+
-
Vbg/2
+
-
VHIGH
VBAT
DRIV
29 FL IN 3
S
ER -
Q
R
+
VHIGH
+
DRIV
-
VHIGH
DRIV
100µH
26 H IN 3
10µF
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
100µH
1 H IN 2
10µF
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
100µH
33 H IN 4
10µF
32 H OUT 4A
34 H OUT 4B
M SLEDGE
MOTOR
6
GND
28 42
36
D94AU111A
6/15

6 Page



ページ 合計 : 15 ページ
 
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