The CS4124 is a monolithic integrated circuit designed primarily to control the rotor speed of permanent magnet, direct current (DC) brush motors. It drives the gate of an N channel power MOSFET or IGBT with a user–adjustable, fixed frequency, variable duty cycle, pulse width modulated (PWM) signal. The CS4124 can also be used to control other loads such as incandescent bulbs and solenoids. Inductive current from the motor or solenoid is recirculated through an external diode.

The CS4124 accepts a DC level input signal of 0 to 5.0 V to control the pulse width of the output signal. This signal can be generated by a potentiometer referenced to the on–chip 5.0 V linear regulator, or a filtered 0 to 100 PWM signal also referenced to the 5.0 V regulator.

The IC is placed in a sleep state by pulling the CTL lead below 0.5 V. In this mode everything on the chip is shutdown except for the on–chip regulator and the overall current draw is less than 275 µA. There are a number of on–chip diagnostics that look for potential failure modes and can disable the external power MOSFET.

Features

• 150 mA Peak PWM Gate Drive Output

• Patented Voltage Compensation Circuit

• 100 Duty Cycle Capability

• 5.0 V, ± 3.0 Linear Regulator

• Low Current Sleep Mode

• Overvoltage Protection

• Boost Mode Power Supply

• Output Inhibit

CS4124属于集成电路（IC） > PMIC - 稳压器 - DC DC 开关式控制器。安森美半导体公司制造生产的CS4124DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。