LB11999 Datasheet, PDF (11/12 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Drivers for CD-ROM Spindle Motor Driver (supports 44x, 48x, 50x)

Continued from preceding page
Pin number Pin name Pin voltage
18 (8) SIG GND
20 (6)
FC
LB11999,11999H
Equivalent circuit
VCC1
2k
Unit (Resistance: Ω, capacitance: F)
Pin function
GND pin for all circuits except output.
Control loop frequency compensator
pin.
Connecting a capacitor between this
pin and GND prevents closed loop
oscillation in current limiting circuitry.
20
(6)
20k
5k
21 (5)
VCREF 1.3V to 2V
15µ
25µ
25µ
15µ
51k
VCC1
Control reference voltage applied
pin.
Determines control start voltage.
22 (4)
VC
0V to VCC1
200
22
(4)
23 (2)
WOUT
24 (1) PWR GND
1 (28)
VOUT
3.9
2 (27)
UOUT
5 (23)
RF
3.9
19 (7)
LMC
VCC1
200
21
(5)
VCC2
5 ₍₂₃₎
23 1 2
(2, 28, 27)
24 ₍₁₎
Speed control voltage applied pin.
V type control technique
VC > VCREF : Forward
VC < VCREF : Slowdown
(Reverse-blocking circuit prevents
reverse rotation.)
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 VCC3 pin and RF
pin. Constant current control and
current limiter works by detecting this
voltage.
5k
15k
7k
RF
19
(7)
16 (12) BRAKE
100 µ
VCC1
75k
50k
16
(12)
Short brake pin.
BRAKE:
High –> Brake
Low/Open –> Drive
No. 6180-11/12