Three-Phase Brushless Motor Driver
Ordering number : EN7257B
LB11872H
Monolithic Digital IC
For Polygonal Mirror Motors
Three-Phase Brushless Motor Driver...
Description
Ordering number : EN7257B
LB11872H
Monolithic Digital IC
For Polygonal Mirror Motors
Three-Phase Brushless Motor Driver
http://onsemi.com
Overview
The LB11872H is a three-phase brushless motor driver developed for driving the motors used for the polygonal mirror in laser printers and similar applications. It can implement, with a single IC chip, all the circuits required for polygonal mirror drive, including speed control and driver functions. The LB11872H can implement motor drive within minimal drive noise due to its use of current linear drive.
Features
Three-phase bipolar current linear drive + midpoint control circuit. PLL speed control circuit. Speed is controlled by an external clock signal. Supports Hall FG operation. Built-in output saturation prevention circuit. Phase lock detection output (with masking function). Includes current limiter, thermal protection, rotor constraint protection, and low-voltage protection circuits on chip. On-chip output diodes.
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter Supply voltage Output current Allowable power dissipation
Operating temperature Storage temperature
Symbol VCC max IO max Pd max1 Pd max2 Topr Tstg
Conditions
T ≤ 500ms Independent IC *With specified substrate
∗ When mounted on the specified printed circuit board : 114.3mm × 76.1mm × 1.6mm, glass epoxy
Ratings 30 1.2 0.8 2.0
-20 to +80 -55 to +150
Unit V A W W °C °C
Stresses exceeding Maximum Ratings may damage the device. Max...
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