MP4657A数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The MP4657A is a single-stage, flyback, 4-string LED driver and system voltage (VSYS) controller for LED backlighting on the secondary side. It controls the flyback power stage and an external N-channel MOSFET to regulate the system output voltage (VOUT) and the LED current loop via integrated 4-string LED current balancing. With a 4V to 16V input voltage (VIN), the MP4657A outputs a direct driving signal to control the N-channel MOSFET that regulates VOUT. It also outputs a compensation signal to control the primary-side flyback (or other power stages) via an optocoupler.

The device supports pulse-width modulation (PWM) dimming and analog dimming to the LED current (ILED) via the ADIMP/PWM pin. For analog dimming, apply a pulse signal with a >5kHz frequency to this pin. For PWM dimming, apply a pulse signal with a <5kHz frequency.

The MP4657A uses an individual control method for ILED and VSYS. If the PWM signal is effective, then the LED current loop is regulated via the flyback power stage, and VSYS is further regulated by the N-channel MOSFET. Soft switching of the N-channel MOSFET reduces voltage spikes. If the PWM signal is ineffective, then the flyback power stage controls VSYS.

Full protection features include LED open protection, LED short protection, LEDx pin short-to-ground protection, over-voltage protection (OVP), feedback (FB) open-loop protection, and thermal shutdown. The MP4657A is available in an SOIC-16 package.

特性 Features

• Single-Stage Flyback for Highly Efficient LED Current (ILED) and System Voltage (VSYS) Regulation
• Individual Control Methods for the LED Driver Stage and VSYS Stage
• 4V to 16V Input Voltage (VIN)
• 80V, 4-String LED Current Balancing
• 5% VSYS Accuracy
• 5% ILED Accuracy and 2% LED Current Balancing
• Low LEDx Regulation Voltage for High Efficiency
• Fast Dynamic Control with Fast Response
• System Input Over-Voltage Protection (OVP)
• System Input Short Protection
• LED Open Protection
• LED Short Protection
• LEDx Pin Short-to-Ground Protection
• Feedback (FB) Open Loop Protection for VSYS
• Soft Switching for External N-Channel MOSFET
• Thermal Shutdown
• Available in an SOIC-16 Package

简介

MP4657A属于集成电路（IC）的LED驱动器。由制造生产的MP4657ALED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。