مدار مجتمع (آی سی) آی‌سی مدیریت توان (پی‌ام‌آی‌سی) آی‌سی درایور ال‌ای‌دی

Product Attributes

Introduction

MT771XH is a high-precision LED constant-current driver IC operating in Critical Conduction Mode (CRM), primarily designed for non-isolated buck LED power supply systems. It supports a full universal input voltage range of 85Vac~265Vac, features adjustable OVP, and the OVP pin provides enable control functionality to support switching color tuning and sensor lamp applications. The IC integrates a 500V high-voltage power MOSFET and employs an innovative high-voltage on-chip power supply scheme, eliminating the need for VCC capacitors and startup resistors, resulting in a simple peripheral circuit and low system cost. A high-precision fast current sampling circuit enables high-frequency operation with excellent line regulation. Operating in CRM, the output current is independent of inductance variation, ensuring superior load regulation. Multiple protection features are also implemented, including LED short-circuit protection and over-temperature automatic adjustment, to ensure system stability.

Features

• No VCC capacitor or startup resistor required
• High-frequency switching support, compatible with chip inductors
• Critical conduction mode, insensitive to inductance
• Adjustable moisture-proof LED output overvoltage protection (OVP)
• No LED flicker at low bus voltage
• OVP pin with enable control, suitable for switching color-tuning and sensor lamp applications
• Output current accuracy: ±5%
• LED short-circuit protection
• Undervoltage lockout (UVLO)
• Automatic over-temperature regulation
• SOP7, DIP7, ESOP8 packages

Applications

• LED bulb lights, fluorescent lamps, signal lights, landscape lights, etc.
• LED candle lights, corn lights, etc.
• LED dimmable, color-tunable, and sensor lights
• Other LED driver applications and general-purpose constant current sources