NXP公司的SSL2108x系列是高壓集成電路,主要用來驅動通用照明的無調光的LED燈,效率大于95%.器件集成了300 V或600 V功率開關,具有多種保護功能如欠壓鎖住(UVLO), 前沿消隱(LEB),過流保護(OCP),短繞組保護(SWP),超溫保護(OTP)以及短路保護(OSP)等.本文介紹了SSL2108X主要特性和優勢,方框圖, 基本應用框圖和降壓轉換器配置圖以及評估板主要特性,電路圖和材料清單(BOM).
The SSL2108X is a range of high-voltage Integrated Circuits (ICs), intended to drive non-dimmable retrofit LED lamps in general lighting applications.
The main benefits of the product family are:
•Small Printed-Circuit Board (PCB) footprint, and compact solution
•High efficiency (up to 95 %)
•Ease of integration
•Low electronic Bill Of Material (BOM)
The product family is made of ICs with a range of internal HV switches for easy power scaling.
The ICs work as boundary conduction mode buck converters. The IC range has been designed to start up directly from the HV supply by an internal high-voltage current source. Followed by the dV/dt supply using capacitive coupling from the drain, or any other auxiliary supply. This functionality provides full flexibility in the application design. The supply current consumed by the IC is 1 mA, an internal clamp limits the supply voltage.
The ICs provide accurate output current control with greater than 5 % LED current accuracy. The ICs can be operated using Pulse-Width Modulation (PWM) dimming and has many protection features including easy LED temperature feedback.
SSL2108X主要特性和優勢:
LED driver IC family driving strings of LEDs from a rectified mains supply
High-efficiency switch mode buck driver product family:
Drivers with integrated 300 V or 600 V power switches
Controller with power-efficient boundary conduction mode of operation with:
No reverse recovery losses in freewheel diode
Zero Current Switching (ZCS) for turn-on of switch
Zero voltage or valley switching for turn-on of switch
Minimal required inductance value and size
Direct PWM dimming possible
Fast transient response through cycle-by-cycle current control:
Negligible AC mains ripple at LED current and minimal total capacitor value
No over or undershoots in the LED current
No binning on LED forward voltage required
Internal Protections:
UnderVoltage LockOut (UVLO)
Leading-Edge Blanking (LEB)
OverCurrent Protection (OCP)
Short-Winding Protection (SWP)
Internal OverTemperature Protection (OTP)
Brownout protection
Output Short Protection (OSP)
Low component count LED driver solution:
No Schottky diode required due to ZCS
No dim switch and high-side driver required for PWM dimming
Easy external temperature protection without additional components
Option for soft-start function
Hotaru switch compatible during standby1
IC lifetime easily matches or surpasses LED lamp lifetime
SSL2108X應用:
SSL2108X products are intended for compact LED lamp ballasts with accurate fixed current output for single mains input voltages. Mains input voltages include 100 V, 120 V and 230 V (AC). The output signal can be modulated using a PWM signal.
圖1. SSL2108X方框圖
圖2. SSL2108X基本應用框圖
圖3. SSL21081/SSL21083降壓轉換器配置圖
圖4. SSL21082/SSL21084降壓轉換器配置圖
火線電壓230VAC 50Hz評估板
The board is optimized for a 230 V (AC, 50 Hz) mains supply. In addition to the mains voltage optimization, the board is designed to work with multiple LEDs or an LED module with a high forward voltage.
Mains connection of this reference board is different from other general evaluation/demo boards. Connect the mains to the screw connector J6.
Remark: The maximum rated voltage of the board is 280 V (limited by the value of electrolytic capacitor C1) or 400 V (DC).
The anode of the LED load is connected to positive positions 1 to 3 of connector J5. The cathode is connected to negative positions 4 to 6 of connector J5.
Use an LED string with a VF greater than 20 volt on this board. Under the expected conditions, the output current is 96 mA. If the rated current of the LED does not meet this specification, the current can be adjusted.
圖5.評估板外形圖
評估板電源指標:
圖6.評估板電路圖
評估板材料清單:
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