LB11872H_08 Datasheet, PDF (1/11 Pages) Sanyo Semicon Device – For Polygonal Mirror Motors Three-Phase Brushless Motor Driver

Ordering number : EN7257B
LB11872H
Monolithic Digital IC
For Polygonal Mirror Motors
Three-Phase Brushless Motor Driver
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
Unit
30
V
1.2
A
0.8
W
2.0
W
-20 to +80
°C
-55 to +150
°C
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the performance, characteristics, and functions of the described products in the independent state, and are not
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customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
82708 MS PC/91002AS (OT) No.7257-1/11