LB11880 データシートの表示（PDF） - SANYO -> Panasonic
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LB11880 Datasheet PDF : 9 Pages
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LB11880
Continued from preceding page.
Pin No.
16
Pin
UOUT
17
VOUT
18
WOUT
20
RF
21
VCC
19
MCOM
22
UIN
23
VIN
Pin voltage
Function
Equivalent circuit
VCC
Drum motor driver output
3.9 Ω
Lowest potential of the drum motor driver output
transistor
This IC implements constant-current control by
detecting this voltage.
The current limiter also operates by detecting this
voltage.
30 kΩ
3.9 Ω
30 kΩ 20
10 kΩ
16
22
17
23
18
24
20 µA
Internal reference voltage and power supply for
8 to 13.8 V both the drum motor driver output block and the
coil waveform detection circuit.
Motor coil center input
The coil voltage waveform is detected with this
voltage as the reference.
VCC
16 17 18
Coil waveform detection comparator input
Each phase output is connected by an internal
10 kΩ resistor.
22
23
24
2 kΩ
10 kΩ
200 Ω
200 Ω
19
200 Ω
24
WIN
25
C1
26
C2
15 µA 15 µA
Triangular wave generating capacitor connection
This triangular wave is used to implement soft
switching in the coil output waveform.
VREG
25
5 µA
26
1 kΩ
1/2VREG
-VF
27
CX
The value of the capacitor connected between this
pin and ground determines the operating frequency
range and the minimum operating frequency of the
VCO circuit.
300 Ω
V REG
100 µA
27
Continued on next page.
No. 6470-8/9
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