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PDF LB11870 Data sheet ( Hoja de datos )
| Número de pieza | LB11870 | |
| Descripción | Three-Phase Brushless Motor Driver for Polygonal Mirror Motors | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number : ENN7256
Monlithic Digital IC
LB11870
Three-Phase Brushless Motor Driver
for Polygonal Mirror Motors
Overview
The LB11870 is a three-phase brushless motor driver
developed for driving the motors used with the polygonal
mirror in laser printers and plain paper copiers. It can
implement, with a single IC chip, all the circuits required
for polygonal mirror drive, including speed control and
driver functions. The LB11870 can implement motor drive
with minimal power loss due to its use of direct PWM
drive.
Functions and Features
• Three-phase bipolar drive
• Direct PWM drive
• Includes six high and low side diodes on chip.
• Output current control circuit
• PLL speed control circuit
• Phase lock detection output (with masking function)
• Includes current limiter, thermal protection, rotor
constraint protection, and low-voltage protection circuits
on chip.
• Deceleration type switching circuit (free running or
reverse torque)
• PWM oscillator
• Power saving circuit
Package Dimensions
unit: mm
3265-HSSOP48
[LB11870]
17.8
(6.2)
48 25
1
(0.45)
0.65
1.3
24
0.2
0.2
1.5
SANYO: HSSOP48 (375 mil)
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Supply voltage
Output current
Allowable power dissipation 1
Allowable power dissipation 2
Operating temperature
Storage temperature
Symbol
VCC max
IO max
Pd max1
Pd max2
Topr
Tstg
Conditions
T ≤ 500 ms
Independent IC
Mounted on a PCB (114.3 × 76.1 × 1.6 mm, glass epoxy)
Ratings
30
1.8
0.85
1.72
–20 to +80
–55 to +150
Unit
V
A
W
W
°C
°C
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
80102AS (OT) No. 7256 -1/14
1 page  
LB11870
Pin Functions
Pin
OUT1
OUT2
OUT3
IN1+, IN1–
IN2+, IN2–
IN3+, IN3–
FG IN+
FG IN–
GND1
GND2
PWM
FC
PD
EI
EO
TOC
FGFIL
CSD
Pin No.
3
1
46
11, 12
9, 10
6, 8
13
14
15
16
17
19
21
22
23
24
25
26
Outputs
The PWM signal controls the duty from the low side transistor.
Hall inputs for the three phases
The logic H state means that VIN+ is greater than VIN–.
FG comparator noninverting input
FG comparator inverting input
Control system ground
Subsidiary ground.
Sets the PWM oscillator frequency. Insert a capacitor between this pin and ground.
Current control circuit frequency characteristics correction. Insert a capacitor between this pin and ground.
Phase comparator output. Outputs the phase error as changes in the pulse duty.
Error amplifier input
Error amplifier output
Torque command input. This pin is normally connected to the EO pin. When the TOC potential falls, the low side output
transistor on duty is changed and the torque increases.
FG filter connection. Insert a capacitor between this pin and ground if noise on the FG signal is a problem.
Sets the operating time for the rotor constraint protection circuit and the initial reset operation.
Insert a capacitor between this pin and ground. If the rotor constraint protection circuit is not used, insert a resistor in
parallel with this capacitor.
CLD
FGS
LD
S/S
CLK
BRSEL
PH
VREG
VM1
VM2
VCC2
VCC1
GND3
FRAME
27
Sets the phase locked signal mask time. Insert a capacitor between this pin and ground. Leave this pin open if there is no
need to mask.
28 FG Schmitt output. This is an open-collector output.
29
Phase locked state detection output. This output goes to the on state when the PLL phase is locked. This is an open-
collector output.
32 Start/stop control input. Low: start, High or open: stop.
33 Clock input. The maximum input frequency is 10 kHz.
Deceleration control switching input. Low: Reverse torque control, High or open: free running.
34
An external Schottky barrier diode is required on the output low side if reverse torque control is used.
35 Smoothes the RF waveform. Insert a capacitor between this pin and ground.
36
5 V regulator output (control circuit power supply). Insert a capacitor between this pin and ground for power supply
stabilization.
37 Output block power supply. Short this pin to VM2.
38 Output current detection. Insert a resistor between this pin and VCC1.
The maximum output current IOUT is set to be IOUT = 0.5/Rf.
39 Upper diode cathode connection. Short this pin to VCC1.
40 Power supply. Insert a capacitor between this pin and ground to assure that noise does not enter the IC.
44 Output circuit block ground.
Connect this pin to ground. The FRAME pin is connected internally to the metal surface on the back of the package. To
improve thermal dissipation, solder this metal surface to the PCB.
2, 4, 5, 7
18, 20, 30
NC 31, 41, 42 Since these pins are not connected to the IC internally, they can be used for wiring connections.
43, 45, 47
48
No. 7256 -5/14
5 Page 
Continued from preceding page.
Pin No. Pin
Function
LB11870
Stabilized power supply output (5 V output).
36 VREG Insert a capacitor of about 0.1 µF between this pin and
ground for stabilization.
Equivalent circuit
Vcc
36
Power supply.
40 VCC1 Insert a capacitor of at least 10 µF between this pin and
ground to prevent noise from entering the IC.
2, 4, 5
7, 18
20, 30
31, 41
42, 43
45, 47
48
NC
Since these pins are not connected to the IC internally,
they can be used for wiring connections.
FRAME Connect this pin to ground.
No. 7256 -11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LB11870.PDF ] | |
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