描述 Description

The MP24881 is a 60V, monolithic, synchronous step-down LED driver with an integrated N-channel MOSFET and rectifier. It delivers up to 1.1A of continuous LED current (ILED) to high-power LEDs. The wide 10V to 60V input voltage (VIN) range accommodates a variety of step-down lighting applications. Hysteretic current mode minimizes the loop compensation design and achieves fast transient response, which makes the 25kHz pulse-width modulation (PWM) dimming frequency possible.

The MP24881 supports analog dimming with a PWM or analog signal input, which helps remove the flicker caused by the PWM frequency (fPWM). The separated PWM and analog dimming input port enables all PWM signal-controlled hybrid dimming. The hybrid dimming depth can reach as low as 0.1%.

Full protections include current-sense (CS) short protection, low-side (LS) reverse over-current protection (OCP), high-side (HS) OCP, and thermal shutdown.

The MP24881 is available in an SOIC-8EP package.

特性 Features

? Wide 10V to 60V Operating Input Voltage (VIN) Range
? Up to 1.1A of LED Current (ILED)
? Synchronous Step-Down Converter
? Internal 100mΩ High-Side MOSFET (HS-FET)
? Internal 110mΩ Synchronous Rectifier (SR)
? Hysteretic Control
? Up to 2MHz Switching Frequency (fSW)
? 100mV Reference Voltage (VREF)
? LED Common Cathode Connection
? Excellent Pulse-Width Modulation (PWM) Dimming Performance:
? Up to 25kHz PWM Dimming Frequency
? 20000:1 Wide Dimming Range

? Down to 0.1% Dimming Depth
? All PWM Signal-Controlled Hybrid Dimming
? High-Side (HS) Over-Current Protection (OCP)
? Current-Sense (CS) Short Protection
? Low-Side (LS) Reverse OCP
? Thermal Shutdown
? Available in an SOIC-8EP Package