RT7333中文资料High-Efficiency PFC Controller数据手册Richtek规格书

描述 Description

The RT7333 is a Power Factor Correction (PFC) controller incorporates advanced technologies such as tracking boost, valley switching, and frequency reduction. It operates in both Critical Conduction Mode (CRM) and Discontinuous Conduction Mode (DCM).The feed-forward schemes and THD optimizer ensure a near-unity power factor across a wide range of input voltages and output power levels.The totem-pole gate driver features an 800mA source current and a 1000mA sink current driving capability. The RT7333 includes a disable function with an extremely low quiescent current (<17μA) to reduce power consumption in standby mode. The controller integrates comprehensive safety protection features, such as input undervoltage lockout, output overvoltage protection, undervoltage protection, and cycle-by-cycle current limiting.The RT7333 is a highly integrated solution with a built-in programmable loop-compensation circuit to minimize the need for external components. It is available in a SOP-8 package.The recommended junction temperature range spans from -40°C to 125°C, while the ambient temperature range extends from -40°C to 85°C.

特性 Features

CRM/DCM Operation
Constant On-Time Control (Voltage Mode)
Built-In Loop-Compensation Circuit
High Efficiency - Tracking Boost - Valley Switching in Both CRM and DCM - Frequency Reduction at Middle Load and Light Load
Disable Function - Low Quiescent Current (<17μA)
Ultra-Low Start-Up Current (<5μA)
Maximum Switching Frequency Clamping (130kHz/176kHz/246kHz/397kHz)
Burst Mode Operation at Light Load
Maximum/Minimum On-Time Limit
Cycle-by-Cycle Current Limit
Output Overvoltage Protection (OVP)
Undervoltage Lockout (UVLO)

应用 Application

•USB-PD
•PC, NB, TV, Monitor
•General Power Supplies