MITSUMI
4ch Moter driver IC for Portable CD Player
Circuit operation
1 H-bridge driver block
(1) Gain setting
· The driver input resistance (ch 1,3 and 4) are 11k
Ω
typ. ,ch2 is 7.5k
Ω
typ. . Set the gain according to the
following formula.
· The driver output stage power supply is HVcc(36PIN), and the bridge circuit power supply is VSYS2
(15PIN). Connect a bypass capacitor between these two power supplies(approximately 0.1µF).
(2) Mute function
· Of the four drivers,ch1 has a brake function,and the other channels have a mute function.
· When BRAKE1(23PIN)is set to high level, both ch1 outputs go low level, and the circuit enters brake mode.
· When MUTE2(21PIN)is set to high level, the ch2 output is muted.
· When MUTE34(19PIN)is set to high level, the ch3 and 4 outputs are muted.
(3) Vref drop mute
· When the voltage applied to Vref(16PIN)is 1.0V or less typ. , the driver outputs are set to high impedance.
(4) Thermal shutdown
· When the chip temperature reaches 150°C typ. the output current is cut. The chip starts operating again at
about 120°C typ. .
2 PWM power supply drive block
· This detects the maximun output level from among the four channels, and supplies the load drive power
supply(36PIN)for the PWM. The external components are a PNP transistor, coil, Schottky diode,and
capacitor.
100k
Ω
47k
Ω
PSW
BATT
44
37
36
HV
CC
SBD
47
µ
F
33
µ
H
PWMFIL
0.1
µ
F
2200pF
10pF
ch1
ch2 GV=20log
55k
(db)
ch3
11k+R
ch2 GV=20log
110k
(db)
7.5k+R
R:Externally-connected input
50
Summary of Contents for PV420S
Page 1: ...SERVICE MANUAL PV420S WWW BBK RU ...
Page 72: ... 69 CXD3068Q Block Diagram ...
Page 73: ... 70 CXD3068Q Pin Configuration ...
Page 122: ... 119 CXD3068Q Timing Chart 1 3 ...
Page 123: ... 120 CXD3068Q Timing Chart 1 4 ...
Page 124: ... 121 CXD3068Q Timing Chart 1 5 ...
Page 129: ... 126 CXD3068Q Timing Chart 2 1 ...
Page 130: ... 127 CXD3068Q Block Diagram 2 2 ...
Page 131: ... 128 CXD3068Q Timing Chart 2 3 ...
Page 134: ... 131 CXD3068Q Timing Chart 2 6 ...
Page 138: ... 135 CXD3068Q VCO C Mode Fig 3 3 Access Flow Chart Using VCO Control ...
Page 140: ... 137 CXD3068Q Block Diagram 4 1 ...
Page 143: ... 140 CXD3068Q Timing Chart 4 4 ...
Page 147: ... 144 CXD3068Q Fig 4 6 a Auto Focus Flow Chart Fig 4 6 b Auto Focus Timing Chart ...
Page 148: ... 145 CXD3068Q Fig 4 7 a 1 Track Jump Flow Chart Fig 4 7 b 1 Track Jump Timing Chart ...
Page 149: ... 146 CXD3068Q Fig 4 8 a 10 Track Jump Flow Chart Fig 4 8 b 10 Track Jump Timing Chart ...
Page 150: ... 147 CXD3068Q Fig 4 9 a 2N Track Jump Flow Chart Fig 4 9 b 2N Track Jump Timing Chart ...
Page 151: ... 148 CXD3068Q Fig 4 10 a Fine Search Flow Chart Fig 4 10 b Fine Search Timing Chart ...
Page 152: ... 149 CXD3068Q Fig 4 11 a M Track Move Flow Chart Fig 4 11 b M Track Move Timing Chart ...
Page 157: ... 154 CXD3068Q Fig 4 15 CD TEXT Data Timing Chart ...
Page 162: ... 159 CXD3068Q Fig 5 3a Fig 5 3b ...
Page 196: ... 193 CXD3068Q Description of Data Readout ...
Page 200: ... 197 CXD3068Q ...
Page 201: ... 198 CXD3068Q ...
Page 202: ... 199 CXD3068Q ...
Page 207: ... 204 CXD3068Q Package Outline Unit mm ...
Page 208: ...This data sheet has been made from recycled paper to help protect the environment 205 ...