LB1928 Sanyo Semiconductor Corporation, LB1928 Datasheet

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LB1928

Manufacturer Part Number
LB1928
Description
Monolithic Digital IC
Manufacturer
Sanyo Semiconductor Corporation
Datasheet
Overview
The LB1928 is a 3-phase brushless motor driver well suited
for drum and paper feed motors in laser printers, plain-paper
copiers and other office automation equipment. Direct PWM
drive allows control with low power losses. Peripheral
circuitry including speed control circuit and FG amplifier is
integrated, thus allows drive circuit to be constructed with a
single chip.
Functions and Features
• Three-phase bipolar drive (30V, 3.1A)
• Direct PWM drive technique
• Built-in diode for absorbing output lower-side kickback
• Speed discriminator and PLL speed control
• Speed lock detection output
• Built-in forward/reverse switching circuit
• Built-in protection circuitry includes current limiter,
Specifications
Absolute Maximum Ratings at Ta = 25 C
Allowable Operating Ranges at Ta = 25 C
Maximum supply voltage
Maximum output current
Allowable power dissipation 1
Allowable power dissipation 2
Operating temperature
Storage temperature
Power supply voltage range 1
Regulator voltage output current
LD output current
Ordering number : ENN6198A
overheat protection, motor restraint protection, etc.
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.
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.
Parameter
Parameter
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
SANYO Electric Co.,Ltd. Semiconductor Company
Pd max 1
Pd max 2
Vcc max
Symbol
Symbol
I
O
I
Topr
Tstg
Vcc
REG
I
LD
max
T
IC only
With an arbitrary large heat sink
500 ms
LB1928
Three-Phase Brushless Motor Driver
Conditions
Conditions
Package Dimensions
unit: mm
3147B-DIP28H
for Office Automation Equipment
1.93
R1.7
1
28
1.78
20.0
27.0
D1099TH(KI)/73099RM(KI)
0.6
[LB1928]
1.0
Ratings
Ratings
14
–55 to +150
15
Monolithic Digital IC
–20 to +80
9.5 to 28
0 to –20
0 to 15
SANYO : DIP28H
LB1928
3.1
30
20
3
No. 6198-1/11
Unit
Unit
mA
mA
W
W
V
A
V
C
C

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LB1928 Summary of contents

Page 1

... Ordering number : ENN6198A Overview The LB1928 is a 3-phase brushless motor driver well suited for drum and paper feed motors in laser printers, plain-paper copiers and other office automation equipment. Direct PWM drive allows control with low power losses. Peripheral circuitry including speed control circuit and FG amplifier is integrated, thus allows drive circuit to be constructed with a single chip ...

Page 2

... Output High level voltage Output Low level voltage Count number [PLL output] Output High level voltage Output Low level voltage [Lock detection] Output Low level voltage Lock range LB1928 Symbol Conditions Icc1 Icc2 In STOP mode Vosat1 Io = 1.0A, Vo(SINK) + Vo(SOURCE) Vosat2 Io = 2.0A, Vo(SINK) + Vo(SOURCE) ...

Page 3

... Hysteresis width High level input current Low level input current [Forward/reverse pin] High level input voltage range Low level input voltage range Input open voltage Hysteresis width High level input current Low level input current LB1928 Symbol Conditions I B(INT –0.2 mA OH(INT) INTO ...

Page 4

... LB1928 F/R = “L” F/R = “H” IN2 IN3 IN1 IN2 IN1+ IN1– GND1 S/S FGIN+ FGIN– FGOUT LB1928 INTOUT INTIN POUT DOUT VM VREG PWM CSD XI Pd max – Ambient temperature, Ta – fosc/8192 IN3 Top view 100 120 No. 6198-4/11 ...

Page 5

... Equivalent Circuit Block Diagram LB1928 No. 6198-5/11 ...

Page 6

... Pin number 28 OUT1 OUT2 OUT3 2 3 GND2 VREG 7 PWM VREG VREG 8 CSD 9 XI VREG 10 XO LB1928 Equivalent circuit 300 A12983 A12984 200 7 2k A12985 300 8 1k A12986 10 9 A12987 Pin function Motor drive output pins. Connect a Schottky diode between these outputs and V ...

Page 7

... Continued from preceding page Pin name Pin number INT 11 VREG OUT PWM comparator INT 12 VREG IN POUT 13 DOUT VREG LB1928 Equivalent circuit 11 A12988 300 12 A12989 VREG 300 13 A12990 VREG 300 14 A12991 15 A12992 Pin function Integrator output pin (speed control pin) Integrator input pin. ...

Page 8

... S/S 19 VREG GND1 20 IN1+ 22 IN1– 21 IN2+ 24 IN2– IN3+ 26 IN3– 25 F/R 27 VREG LB1928 Equivalent circuit 16 A12993 300 300 17 A12994 2k 19 A12995 VREG 300 300 A12996 2k 27 A12997 Pin function FG amplifier output pin. FG amplifier input pin. By connecting a capacitor (approx. 0.1 F) between FGIN+ and ground, the logic circuitry is reset ...

Page 9

... Crystal oscillator frequency 2. Output drive circuit In order to reduce power loss at the output, the LB1928 uses the PWM drive technique. While ON, the output transistors are always saturated, and motor drive power is adjusted by varying the output ON duty ratio. Because output PWM switching is performed by the lower-side output transistor, a Schottky diode must be connected between OUT and V ...

Page 10

... The magnitude of the current is determined by the motor counterelectromotive voltage and the coil resistance. This current may not exceed the rated current (3.1A). (Forward/reverse switching at high speed therefore is not safe.) LB1928 (Reference values ...

Page 11

... This catalog provides information as of December, 1999. Specifications and information herein are subject to change without notice. LB1928 pin and ground to assure stable operation diode ...

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