LB11873-TRM-E Datasheet, PDF (1/14 Pages) ON Semiconductor – For Polygonal Mirror Motors Three-Phase Brushless Motor Driver

Ordering number : ENA0081B
LB11873
Monolithic Digital IC
For Polygonal Mirror Motors
Three-Phase Brushless Motor Driver
http://onsemi.com
Overview
The LB11873 is a 3-phase brushless motor driver developed for driving the polygonal mirror motor used in plain-paper
copiers and similar products. This IC can implement the circuits required for polygonal mirror motor drive (speed
control and driver circuits) in a single chip.
The LB11873 implements low-noise/low-vibration PWM drive by changing the current at phase switching gradually to
reduce motor noise.
Functions
• Three-phase bipolar drive (quiet direct PWM)
• PLL speed control circuit
• Hall sensor FG support
• Dedicated external clock
• Brake mode switching circuit (free running and reverse braking)
• Phase lock detection output (with masking function)
• Built-in current limiter, constraint protection, undervoltage protection, thermal protection, and CLK line
disconnection protection circuits
• Input pins support 3V system microcontrollers
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Supply voltage
Output current
Allowable power dissipation 1
VCC max
IO max
Pd max1
T ≤ 500ms
Independent IC
Allowable power dissipation 2
Pd max2
When mounted on a circuit board *1
Operating temperature
Topr
Storage temperature
Tstg
*1 Specified circuit board : 114.3 × 76.1 × 1.6mm³, glass epoxy.
Ratings
Unit
30
V
1.8
A
0.9
W
2.1
W
-20 to +80
°C
-55 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
May, 2013
71107 TI PC 20070621-S00004/41807 TI PC B8-9144 No.A0081-1/14