12
KDV-3241Y/MP4339
/MP4439/MP5032
CIRCUIT DESCRIPTION
INTERNAL BLOCK DIAGRAM OF IC’S
OIPMG78431A (MAIN UNIT IC301)
• PIN FUNCTION (Note1)
Pin No.
Pin name
Function
Protection function
Normal
operation
TSD On
(Note2)
VB=24V
(Note3)
VB=50V
(Note3)
1
GND
Ground
-
-
-
-
2
FREG_B
External Trs bass drive (Note4)
On/Off
On/Off
Off
Off
3
FREG_F
FREG feedback terminal
On/Off
On/Off
Off
Off
4
ILMOUT
8.4V output for JLM/500mAmax
On/Off
Off
Off
Off
5
CTL4
FREG control terminal
-
-
-
-
6
CDOUT
8.0V output for CD/1.3Amax (Note4)
On/Off
Off
Off
Off
7
DSPOUT
3.3V output for DSP/250mAmax (Note4)
On/Off
Off
Off
Off
8
VB
Battery
-
-
-
-
9
CTL3
ILM control terminal
-
-
-
-
10
AUDIOOUT
8.4V output for AUDIO/500mAmax (Note4)
On/Off
Off
Off
Off
11
CTL1
DSP, CD, Audio control terminal
-
-
-
-
12
EXTOUT
High side output/600mAmax (Note4)
On/Off
Off
Off
Off
13
CTL2
EXT control terminal
-
-
-
-
14
VDDOUT
5.7V output for micro controller (Note4)
On
On
On
Off
15
VBUP
Back up
-
-
-
-
GND
BIAS
VB
+B
VDDOUT
AUDIOOUT
ILMOUT
CTL 1
GND
TAB
V
REF
1.5V
Over voltage detect
TSD
V
REF
CDOUT
V
REF
EXTOUT
VBUP
DSPOUT
CTL 2
2.5V
CTL 3
2.5V
CTL 4
2.5V
15
FREG F
RFREG3
FREG B
13
12
11
10
9
8
7
6
5
4
3
2
1
14
3.5V
DBUP
CBUP
100uF
CVDD
10uF
CDSP
10uF
CAUDIO
10uF
CCD
0.1uF
CEXT
10uF
CILM
0.1uF
CFREG
10uF
QFREG
RFREG1
RFREG2
DEXT1
DEXT2
C1
100uF
C2
0.1uF
• BLOCK DIAGRAM
Note1.
In the uper table. “On” means always On. “Off” means
compulsory Off and “On/Off” means that it can con-
trol by control terminal.
Note2.
Thermal protection circuit
A built-in thermal protection circuit (TSD:Thermal shut
down) prevents thermal damage to the IC. All outputs
except VDD (pin14) and FREG (pin2&3) are switched
off when the circuit operates, revert to the original
state when the temperature drops to a certain level.
Note3.
Overvoltage protection circuit
The overvoltage protection circuit (surge protector)
turns off all outputs without Vdd, when VB voltage
is more than about 21V. And the overvoltage protec-
tion circuit (surge protector) turns off Vdd output with
other all outputs, when VB voltage is more than about
26V. When the overvoltage protection operates on
VB>=18V condition, the stand by current increases.
Note 4.
Overcurrent protection circuit
FREG_B (pin2), ILMOUT (pin4), CDOUT (pin6),
DSPOUT (pin7), AUDIOOUT (pin10), EXITOUT (pin12),
VDDOUT (pin14) output circuits are built-in overcur-
rent protection circuit based on the respective output
current. These overcurrent protection circuits limit
the current with a curve shape of “7” in the voltage-
current graph. This prevents IC destruction due to
overcurrent.