Product Summary

The LB1921 is a single-chip motor driver circuit that provides direct PWM drive output appropriate for driving the power brushless motors used in office automation equipment. The LB1921 also provides a variety of peripheral functions, including speed control and FG amplifier circuits, on chip. The applications of the LB1921 include Paper feed and drum motor drivers in FAX and PPC
units.

Parametrics

LB1921 absolute maximum ratings: (1)Maximum supply voltage, VCC max: 30 V; (2)Maximum supply voltage, VM max: 30 V; (3)Output current, IO max: 3.5 A when T ≤ 100 ms; (4)Allowable power dissipation, Pd max1: 3 W when Independent IC; (5)Allowable power dissipation, Pd max2: 20 W when With an arbitrarily large heat sink; (6)Operating temperature, Topr: –20 to +80℃; (7)Storage temperature, Tstg: –55 to +150℃.

Features

LB1921 features: (1)The LB1921 is an improved output current version of the LB1824; (2)Three-phase bipolar brushless motor driver; (3)Digital speed control circuit; (4)Thermal shutdown circuit; (5)Start/stop pin; (6)Lock detector output; (7)Crystal oscillator and divider circuits; (8)FG and error amplifiers; (9)Power supply current limiter.

Diagrams

LB1921 equivalent circuit block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
LB1921
LB1921
Other

Data Sheet
Negotiable 
Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
LB1920
LB1920
Other

Data Sheet
Negotiable 
LB1921
LB1921
Other

Data Sheet
Negotiable 
LB1922
LB1922
Other

Data Sheet
Negotiable 
LB1948MCGEVB
LB1948MCGEVB
ON Semiconductor
Power Management IC Development Tools EVABORD FOR LB1948MC
Data Sheet
0-1: $38.96
LB1973JAGEVB
LB1973JAGEVB
ON Semiconductor
Power Management IC Development Tools EVM FOR LB1973JA
Data Sheet
0-1: $38.96
LB1962MC-AH
LB1962MC-AH
ON Semiconductor
Motor / Motion / Ignition Controllers & Drivers BRUSHLESS MOTOR DRIVER
Data Sheet
0-1860: $0.45
1860-2500: $0.45
2500-5000: $0.44
5000-10000: $0.42