LB11997H Datasheet, PDF (7/8 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Driver for CD-ROM Spindle Drive

LB11997H
Continued from preceding page
Pin number Pin name Pin voltage
5
V_CREF
0V to V_CC1
–1.5V
4
V_C
0V to V_CC1
2
W_OUT
1
PWR GND
28
V_OUT
27
U_OUT
23
RF
7
LMC
12
BRAKE
Equivalent circuit
15µA
25µA
25µA
15µA
VCC1
200Ω
4
51kΩ
200Ω
5
3.9Ω
3.9Ω
VCC1
A12513
VCC2
23
27 28 2
1
A12514
RF
5kΩ
15kΩ
7kΩ
7
A12515
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.)
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.
When this pin is connected to GND,
the limiter setting current is
increased by a factor of 1.5.
100µA
VCC1
75kΩ
12
50kΩ
Short brake pin.
BRAKE:
High –> Short brake operation
Low/Open –> Motor drive operation
A12516
No. 6231-7/8