lb1876 Sanyo Semiconductor Corporation, lb1876 Datasheet - Page 5

• Manufacturer Part Number: lb1876
• Description: Three-phase Brushless Motor Driver For Polygon Mirror Motors
• Manufacturer: Sanyo Semiconductor Corporation

Pin Description
IN1+, IN1–
IN2+, IN2–
IN3+, IN3–
Pin name
FRAME
FG IN+
FG IN–
LDSEL
BRSEL
FGFIL
VREG
OUT1
OUT2
OUT3
GND1
GND2
GND3
PWM
CSD
TOC
CLD
FGS
VM1
VM2
VCC
CLK
S/S
FC
PH
EO
PD
NC
LD
EI
Pin number
3, 35
8, 9
6, 7
4, 5
36
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
—
2
1
Hall input pins for each phase.
Logic High indicates VIN+ > VIN–.
Restraint protection circuit operating time setting pin/reset pulse setting pin.
Connect to ground via capacitor. If the protection circuit is not to be used, connect a resistor in parallel
with capacitor.
Torque specifying input pin. Normally connected to EO pin. When TOC potential falls, ON duty cycle ratio of
lower side output transistors changes and torque increases.
Phase lock signal masking time setting pin. Connect to ground via capacitor. Leave open if masking is not
required.
Output current detector pin. Connect to VCC via low resistor.
Set to maximum output current IOUT = 0.5/Rf.
Phase lock signal masking switching pin. When "Low", the unlock signal (short "High" signal of LD output) is
masked. When "High" or Open, the lock signal (short "Low" signal of LD output) is masked.
Braking method select pin. "Low" selects reverse torque control and "High" or Open selects free-run.
When reverse torque is controlled, lower side output transistors require external SBD.
The FRAME pin is connected internally to the metal frame at the base of the IC. Electrically, both the FRAME
pin and the metal frame are left open. To improve thermal dissipation, provide a corresponding land on the
PCB and solder the FRAME pin to that land.
Output pins.
PWM controls duty cycle ratio by lower transistors.
Connect Schottky diode between these pins and VCC.
FG comparator non-inverting input.
FG comparator inverting input.
Control circuit ground.
Sub-ground.
PWM oscillation frequency setting pin. Connect to ground via capacitor.
Current control circuit frequency characteristics compensation pin. Connect to ground via capacitor.
FG filter pin. Connect to ground via capacitor if noise in FG signal is a problem.
RF waveform smoothing pin. Connect to ground via capacitor.
Error amplifier output.
Error amplifier input.
Phase comparator output pin. Phase deviation is output as a duty cycle change of the pulse.
FG Schmitt output (open collector output).
Phase lock detector output (open collector output). Goes ON when PLL is locked.
Start/stop input. Low: Start; High or Open: Stop.
Clock input. 10 kHz max.
Output block power supply. Short to VM2 for use.
Power supply pin. Connect to ground via capacitor to prevent noise.
5V regulator output pin (control circuit power supply). Connect to ground via capacitor to stabilize operation.
Output circuit ground.
Not connected internally. Can be used for wiring.
LB1876
Function
No. 6201-5/14