lb1855nm Sanyo Semiconductor Corporation, lb1855nm Datasheet - Page 3

• Manufacturer Part Number: lb1855nm
• Description: 3-phase Brushless Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

Sample Application Circuit
Hall input voltage range: 2.2 to (V
70 mV p-p to 300 mV p-p AC
Truth Table
Input: “H” indicates that the input phase 1 is at least 0.2 V higher than phase 2.
Pin Functions
Pin No.
Item
1
2
3
4
5
6
1
2
3
4
5
6
“L” indicates that the input phase 1 is at least 0.2 V lower than phase 2.
U phase
W phase
W
V phase
W phase
U
V phase
U phase
V
V
Pin
FC
OUT
OUT
R
OUT
CC
Source
f
Pin voltage (V)
W phase
W phase
U phase
V phase
V phase
U phase
sink
7 to 18
• Frequency characteristics correction
• Power supply pin
• Outputs pin
• Ground for the output transistor
U
H
H
H
L
L
L
Oscillation in the current control closed loop can be prevented
by inserting a capacitor between this pin and VREF.
The output current can be detected as a voltage by inserting the
resistor Rf between this pin and ground to provide fixed current
drive. The current limiter also operates by detecting this voltage.
CC
Input
– 0.7) V DC
H
H
H
V
L
L
L
W
H
H
H
L
L
L
Pin description
However, note that certain motors may require output capacitors to prevent oscillation.
LB1855NM
Equivalent circuit
Continued on next page.
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