LB11873 Datasheet, PDF (1/14 Pages) Sanyo Semicon Device – Monolithic Digital IC 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
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
VCC max
IO max
T ≤ 500ms
Allowable power dissipation 1
Pd max1
Independent IC
Allowable power dissipation 2
Pd max2
When mounted on a circuit board *1
*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
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71107 TI PC 20070621-S00004/41807 TI PC B8-9144 No.A0081-1/14