"Keywords:
LED driver, lnk406eg, PAR30, powerint
Powerint's 13.5w isolated dimmable PFC LED driver adopts linkswitchtm-ph series lnk406eg device, with input voltage of 185vac to 265vac and output of 36V / 425ma, which can be used for PAR30 / PAR38 reflector. This paper introduces the main characteristics and block diagram of linkswitch-ph series LED driver, 7W and 14W LED driver circuit diagram and 13.5w LED driver reference design for PAR30 / PAR38 der314 main characteristics and indicators, circuit diagram and bill of materials, transformer circuit diagram and PCB layout
The LinkSwitch-PH dramaTIcally simplifies implementaTIon of LED drivers requiring long lifeTIme, high efficiency, PF >0.9, and TRIAC dimming capability (LNK403-409). The single-stage combined power factor and constant-current controller eliminates a switching stage and the electrolyTIc bulk capacitor. The advanced primary-side control used by the LinkSwitch-PH device provides accurate constant current control while eliminating the need for an optocoupler and current sensing circuits.
LinkSwitch-PH incorporates a 725 V power FET, a continuous-mode PWM controller, a high voltage switched current source for self biasing, frequency jittering, protection circuitry including cycle-by-cycle current limit and hysteretic thermal shutdown.
Main characteristics of linkswitch pH LED Driver:
Product Highlights
Dramatically Simplifies Off-line LED Drivers
• Single-stage combination of power factor correction and accurate constant-current (CC) output
• Enables very long lifetime designs (no electrolytic capacitors)
• Eliminates optocoupler and all secondary current control circuitry
• Eliminates control loop compensation circuitry
• Simple primary-side PWM dimming interface
• Universal input voltage range
• LNK403-409 optimized for flicker-free TRIAC dimming
EcoSmart ™ – Energy Efficient
• Single-stage PFC combined with output CC control
• Greatly increases efficiency, >90% achievable
• Reduces component count
• No current sense resistors
• Low standby power remote ON/OFF feature (<50 mW at 230 VAC)
Accurate and Consistent Performance
• Compensates for transformer inductance variations
• Compensates for line input voltage variation
• Frequency jittering greatly reduces EMI filter size and cost
Advanced Protection and Safety Features
• Auto-restart for short-circuit protection
• Open circuit fault detection mode
• Automatic thermal shutdown restart with hysteresis
• Meets high voltage creepage requirement between DRAIN and all other signal pins both on PCB and at package
Green Package
• Halogen free and ROHS compliant package
Linkswitch pH application:
• Off-line LED driver
2012-2-7 13:00:19 upload
Download attachment (23.85 KB)
Figure 1. Linkswitch pH function block diagram
2012-2-7 13:00:19 upload
Download attachment (19.04 KB)
Figure 2. Linkswitch pH application circuit diagram: triac dimming high PFC 14W LED Driver with general input isolation
2012-2-7 13:00:19 upload
Download attachment (19.67 KB)
Figure 3. Linkswitch pH application circuit diagram: universal input isolated non dimming high PFC 7W LED driver
13.5w LED driver reference design der314 for PAR30 / PAR38
The document describes an isolated high power factor (PF) TRIAC dimmable LED driver designed to drive a nominal LED string voltage of 36 V at 425 mA from an input voltage range of 185 VAC to 265 VAC. The LED driver utilizes the LNK406EG from the LinkSwitch-PH family of ICs.
Key goals for this design were:
Lowest cost
Small size
Efficiency
Demonstration of (optional) thermal fold back (output current reduces above temperature threshold)
The topology used is a single-stage power factor corrected flyback that meets high efficiency, high power factor, low THD, isolation, low component count, and stringent space requirements for this design.
High power factor and low THD is achieved by employing the LinkSwitch-PH IC which also provides a sophisticated range of protection features including auto-restart for open control loop and output short-circuit conditions. Line overvoltage provides extended line fault and surge withstand, and accurate hysteretic thermal shutdown that ensures safe average PCB temperatures under all conditions.
This document contains the LED driver specification, schematic, PCB diagram, bill of materials, transformer documentation and typical performance characteristics.
Main characteristics of reference design der314:
High efficiency, ≥87% at 230 VAC
Low cost
Single-stage converter
Single sided PCB
Low component count
Enhanced user experience
Flicker free, fast monotonic start-up (<300 ms) – no perceptible delay
Broad dimmer compatibility
Flicker-free
Tested with common types from Australia, China, Korea and Germany
Integrated protection and reliability features
Output open circuit / output short-circuit protected with auto-recovery
Line input overvoltage shutdown extends voltage withstand during line faults
Auto-recovering thermal shutdown with large hysteresis protects both components and
printed circuit board
IEC 61000-4-5 ring wave, IEC 61000-3-2 C and EN55015 B conducted EMI compliant
2012-2-7 13:00:19 upload
Download attachment (47.58 KB)“
Our other product:
