Powerint's high-efficiency non-isolated 25W offline LED driver reference design is a LNK409EG device using a linkswitch-pH series, which can drive 72V LED strings at 350mA. The input voltage ranges from 180 Vac to 265 Vac, and the power factor is greater than 0.9, and the efficiency is greater than 90%. The THD is less than 20% in 230VAC, and IEC61000-3-2 is compatible. Here mainly introduces the main characteristics of the reference design DER285, drive power indicators, and reference design circuit diagrams, materials list and PCB layout.
LED driver LED drive LNK409EG using LinkSwitchTM-pH 25 W non-isolation, buck-boost topology, power factor correction LED drive LNK409EG
This document describes a non-isolated, power factor correction, low THD, high efficiency LED driver, is intended to drive the 72 V LED string input voltage range of 350 mA when the range of 180 Vac to 265 Vac
The development of LinkSwitch-pH is designed to efficiently design a high-efficiency single-stage power factor correction LED driver with primary side constant current control.
The LinkSwitch-PH controller is optimized for LED driver applications, with minimal external parts, and no need to use an optocoupler to control the output current through the LED load.
Linkswitch-pH monoliths integrate 725 V power MOSFET and controllers.
The controller includes an oscillator, a PWM, a 6 V regulator, a BYPASS (BP) pin programming function, overheating protection, frequency jitter, cycle current limit, frontier blanking and charging control for outputting CC (constant current) Control.
Linkswitch-pH also provides a series of complex protection features, including automatic restarts for control loop open / short-circuit faults and output short-circuit conditions. Accurate hysteresis thermal shutdown functions ensures a safe average PCB temperature in all conditions.
The non-sub-power factor correction buck-boosting shows how LinkSwitch-pH is greatly simplified from the LINKSWITCH-PH, which greatly simplifies offline, efficient, power factor correction LED driver design.
The main features of the LED driver reference design:
Greatly simplified the LED driver design of offline, power factor correction
Single-stage, power factor correction non-separated LED driver
Compact components, very little components
Cross-line and load
High PF "0.9 high efficiency" 90%
Low THD, "20% in 230 Vac,
Comply with IEC61000-3-2 standards,
Eliminate all control loop compensation
No output current sense
Advanced performance
Compensation inductance tolerance
Compensation input voltage change
Compensation output voltage change
Frequency jitter greatly reduces the cost of EMI filters
Advanced protection and safety function
Short circuit automatic restart protection
Slag heat shutdown
Figure 2. LED driver reference design and PQ2620 inductor dimension diagram
LED driver power indicator:
Figure 3. LED Reference Driving Design Circuit Diagram: T1 placement is suitable for EFD30, PQ2620 and RM8 skeleton
Figure 4. Inductor circuit diagram
Inductive electrical indicators:
LED driver reference design materials list:
Figure 5. LED driver reference design PCB layout map
Editor in charge: GT, read full text
Our other product:
