Akai MPK Road 88 - Page 51

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Check REV Description
Title:
Size
A3
Number Revision
Date :
File Name:
Sheet of
Design By :
DATEDesignApproval
POWER
AUDIO MUTI NG CIRCUIT
Q5 MMBT2907
D4 MMBD4148
D5
MMBD4148
Q6 MBT4403
MUTE
MUTE_CONTROL
-4VA
2.5V reference 4.003V threshold
POWER FAIL DETECT @6V
R21 16.9k 1% R19 301 ohm 1%
U5
LM431ACM3
+
3
-
2
1
U4A
LM393
+
5
-
6
7
U4B
LM393
84
+V
-V
U4C LM393














! "
#
!
1 3 2
J1
DGND
D1 MBRA340T3
D+3.3V
DGND
DGND
DGND
DGND
+
EC9
100uF/16V
L1 1uH L2 1uH
DGND
C23 0.1uF
1 2 34
5 6
D6
+VBUS
1
D-
2
D+
3
GND
4
56
J2
CHGND
$
%
&
&
'
(
)
*
+
,
+
)
'
&
MBRS140LT3 D2
1 3
D3 12V
1uF C17
DGND
+5V(VBUS)
+5V
DGND
POWER DETECT
DMP3099L
DS
G
Q3
USB_D_N USB_D_P
USB_N USB_P
Q4
MBT4403
Q7
0.1uF C20
0.1uF
C21
0.1uF
C18
0.1uF
C19
R12 1KΩ
R11 1KΩ
R13 1KΩ
R26 1MΩ
R15 10K
R16 10K
R17 10K
R22 10K
R23 10K
R24 475Ω
R25 1.21KΩ
R18 47.5KΩ
R20 47.5KΩ
R14 820KΩ
1uF
C11
1uF
C12 1uF C22
1
2
TE1
1 2 3 4 5
TE2
+5V
DGND
DGND DGND
AGND
C7 0.1uF
-
.

/
0
1
2
3
4
.
-
-
.
5
/
0
1
2
3
CHGND
EMC
C2 0.1uF C1 0.1uF
+
EC10 1uF/50V