MIC3232中文资料400kHz Fixed Frequency Boost Driver Controller for High Power LEDs数据手册Microchip规格书

描述 Description

The MIC3230/1/2 are constant current boost switching controllers specifically designed to power one or more strings of high power LEDs. The MIC3230/1/2 have an input voltage range from 6V to 45V and are ideal for a variety of solid state lighting applications.The MIC3230/1/2 utilizes an external power device which offers a cost conscious solution for high power LED applications. The powerful drive circuitry can deliver up to 70W to the LED system. Power consumption has been minimized through the implementation of a 250mV feedback voltage reference providing an accuracy of ±3%. The MIC323x family is dimmable via a pulse width modulated (PWM) input signal and also features an enable pin for low power shutdown.Multiple MIC3230 ICs can be synchronized to a common operating frequency. The clocks of these synchronized devices can be used together in order to help reduce noise and errors in a system.An external resistor sets the adjustable switching frequency of the MIC3230/1. The switching frequency can be between 100kHz and 1MHz. Setting the switching frequency provides the mechanism by which a design can be optimized for efficiency (performance) and size of the external components (cost). The MIC323x family of LED drivers also offer the following protection features: Over voltage protection (OVP), thermal shutdown and under voltage lockout (UVLO).The MIC3231 offers a dither feature to assist in the reduction of EMI. This is particularly useful in sensitive EMI applications, and provides for a reduction or emissions by approximately 10dB.The MIC3232 is a 400kHz fixed frequency device offered in a small MSOP-10 package. The MIC3230/1 are offered in ePad TSSOP-16 package.

特性 Features

• 6V to 45V input supply range
• Capable of driving up to 70W
• Ultra-low EMI via dithering on the MIC3231
• Programmable LED drive current
• Feedback voltage = 250mV ±3%
• Programmable switching frequency (MIC3230/1) or 400kHz fixed frequency operation (MIC3232)
• PWM dimming and separate enable shutdown
• Frequency synchronization with other MIC3230s
• Protection features:
• Over voltage protection (OVP)
• Over-temperature protection
• Under voltage lockout (UVLO)
• -40°C to +125°C junction temperature range

简介

MIC3232属于集成电路（IC）的LED驱动器。由Microchip制造生产的MIC3232LED 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。