LB11870_07 SANYO [Sanyo Semicon Device], LB11870_07 Datasheet - Page 7

• Manufacturer Part Number: LB11870_07
• Description: For Polygonal Mirror Motors Three-Phase Brushless Motor Driver
• Manufacturer: SANYO [Sanyo Semicon Device]

Pin Functions
Pin No.
46
44
37
38
39
11
12
10
13
14
15
16
17
3
1
9
6
8
Symbol
FG IN +
OUT1
OUT2
OUT3
GND3
V CC 2
FG IN -
GND1
GND2
PWM
VM1
VM2
IN1+
IN2+
IN3+
IN1-
IN2-
IN3-
Motor drive output
Output block ground
Output block power supply and current
detection.
Insert the resistor Rf between this pin and
V CC 1.
The output current will be limited to the current
value
I OUT = VRF/Rf.
Upper diode cathode connection. Short this pin
to V CC 1.
Hall element inputs.
The high state is when IN+ is greater than IN-,
and the low state is the reverse.
An amplitude of at least 100mVp-p (differential)
is desirable for the Hall element signal inputs. If
noise on the Hall signals is a problem, insert
capacitors between the IN+ and IN- inputs.
FG input.
If noise on the FG signal input is a problem,
connect a filter consisting of either a capacitor
or a capacitor and a resistor.
Control circuit block ground
SUBGND pin
Sets the PWM oscillator frequency.
Insert a capacitor between this pin and ground.
The PWM oscillator frequency is set to about
34kHz when a 680pF capacitor is used.
Pin Description
LB11870
6
VREG
9
V CC 1
13
11
300Ω
300Ω
VREG
VREG
300Ω
Equivalent Circuit
200Ω
Continued on next page.
300Ω
300Ω
39
38
37
44
1
3
8
No.7256-7/14
14
46
10
17
12