NXP公司的SSL4120是一款集成功率因数修正控制器和半桥谐振转换器控制器的多芯片集成电路芯片。它提供的驱动功能包括一个上升变换器驱动分立MOSFET和一个谐振半桥驱动两个分立功率MOSFET的配置。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。
The SSL4120 integrates a Power Factor Corrector (PFC) controller and a controller for a Half-Bridge resonant Converter (HBC) in a multi-chip IC. It provides the drive function for the discrete MOSFET in an up-converter and for the two discrete power MOSFETs in a resonant half-bridge configuration.
Efficient PFC operation is achieved by implementing functions for Quasi-Resonant (QR) operation at high-power levels and QR with valley skipping at lower power levels.OverCurrent Protection (OCP), OverVoltage Protection (OVP) and demagnetization sensing ensure safe operation under all conditions
The HBC module is a high-voltage controller for a zero-voltage switching LLC resonant converter. It contains a high-voltage level shift circuit and several protection circuits including OCP, open-loop protection, capacitive mode protection and a general purpose latched protection input.
The high-voltage chip is fabricated using a proprietary high-voltage Bipolar-CMOS-DMOS power logic process enabling efficient direct start-up from the rectified universal mains voltage. The low-voltage Silicon-On-Insulator (SOI) chip is used for accurate, high-speed protection functions and control.
The SSL4120 controlled PFC circuit and resonant converter topology is very flexible. It can be used for a broad range of applications over a wide mains voltage range. Combining PFC and HBC controllers in a single IC makes the SSL4120 ideal for controlling compact power supplies in lighting applications, such as LED drivers. Using the SSL4120, highly efficient and reliable power supplies providing over 100 W can be designed easily which use the minimum of external components.

SSL4120主要特性：
General features
 Integrated PFC and HBC controllers
   Universal mains supply operation from 85 V to 305 V (AC)
 High level of integration resulting in a low external component count and a cost effective design
 Enable input to enable only the PFC or both the PFC and HBC controllers
 On-chip high-voltage start-up source
 Stand-alone operation or IC supplied from external DC source
 PFC controller features
 Boundary mode operation with on-time control
 Valley/zero-voltage switching for minimum switching losses
 Frequency limiting to reduce switching losses
 Accurate boost voltage regulation
 Burst mode switching with soft-start and soft-stop
HBC controller features
 Integrated high-voltage level shifter
 Adjustable minimum and maximum frequency
 Maximum 500 kHz half-bridge switching frequency
 Adaptive non-overlap time
 Burst mode switching
Protection features
 Safe restart mode for system fault conditions
 General latched protection input for output overvoltage protection or external temperature protection
 Protection timer for time-out and restart
 Overtemperature protection
 Soft (re)start for both controllers
 Undervoltage protection for mains (brownout), boost, IC supply and output voltage
 Overcurrent regulation and protection for both controllers
 Accurate overvoltage protection for the boost voltage
 Capacitive mode protection for the HBC controller

SSL4120应用：
The IC is used in all LED lighting applications that require very efficient, low Total Harmonic Distortion (THD), high Power Factor (PF) and a universal mains input voltage.
The SSL4120 provides a cost-effective power supply solution between 25 W and 400 W.
 
图1. SSL4120内部方框图

SSL4120方案介绍：
The SSL4120DB1123 is a dimmable global mains 90 W LED driver demo board featuring the NXP Semiconductors SSL4120T IC.
The board has a two-stage (PFC + resonant) topology to achieve good THD performance (mains current class C compliance) over a wide mains input voltage range and output power range.
The SSL4120DB1123 can drive a large LED voltage/current range.

Features and benefits
• Efficient PFC and LLC topology
• Large input voltage range
• Short turn-on delay time
• Low mains current harmonics
• LLC stage with large output voltage range
• Dimmable
• Single layer PCB 146 x 60 mm, wave soldering

SSL4120方案原理图：

图2. SSL4120方案原理图

SSL4120方案材料清单：




PCB元件布局图：