TDA7278 Datasheet, PDF (3/15 Pages) STMicroelectronics – HIGH-EFFICIENCY CD ACTUATOR DRIVER

PIN FUNCTIONS
N^o
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
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