LB1996 Datasheet, PDF (8/9 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Driver for CD-ROM Spindle Drive

LB1996
Continued from preceding page
Pin number Pin name Pin voltage
21
V_CREF
2V to 3V
22
V_C
0V to V_CC1
Equivalent circuit
22
200Ω
25µA
25µA
10kΩ
30kΩ
15kΩ
30kΩ
100µA
200Ω
100µA
VCC1
21
Pin function
Control reference voltage supply
pin. Determines control start
voltage.
Speed control voltage supply pin
V type control technique
V_C > V_CREF : Forward
V_C < V_CREF : Slowdown
(Reverse-blocking circuit
prevents reverse rotation.)
23
W_OUT
24
PWR GND
1
V_OUT
2
U_OUT
5
RF
19
FGC_SC_EL
16
BRAKE
3.9Ω
3.9Ω
100µA
75kΩ
50kΩ
75kΩ
50kΩ
VCC2
5
23 1 2
24
VCC1
19
VCC1
16
A11177
A11178
A11179
W phase output
Output transistor GND
V phase output
U phase output
Upper side output NPN transistor
collector pin (common for all 3
phases). For current detection,
connect resistor between V_CC3
pin and RF pin. Constant current
control and current limiter works
by detecting this voltage.
3 Hall FG/1 Hall FG switching
pin
FG_SEL
High –> 3 Hall FG
Low/Open –> 1 Hall FG
Short brake pin
BRAKE:
High –> Short brake operation
Low/Open –> Motor drive operation
A11180
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