PowerIntLNK407EG15WLED driver solution (DER278)

PowerInt’s LNK403-409EG/413-419EG LinkSwitch-PH series are LED drivers with PF>0.9, TRIAC dimming compatible (LNK403-409) and high efficiency, single-stage PF and constant current controllers that do not require PFC and electrolytic capacitors and other passive components. The device integrates 725V power MOSFET, continuous mode PWM controller, high voltage switching current source for self-biasing, cycle-by-cycle current limiting and hysteretic thermal shutdown circuit, mainly used in offline LED drivers. This article introduces LinkSwitch-PH Series Key Features, Block Diagram, Typical Application Circuit Diagram, Universal Input 7W and 14W LED Driver Block Diagram, and Capacitorless High Efficiency (greater than 90%), High Power Factor (greater than 0.9) 15W LED Driver Reference Design Using LNK407EG Key Features , circuit diagram, bill of materials.

LNK403-409EG/413-419EG LinkSwitch-PH Family

LED Driver IC, Single-Stage PFC, Primary-Side Constant Current Control and TRIAC Dimming/Non-Dimming Device Options

The LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring PF >0.9, TRIAC dimmer capability (LNK403-409) and high efficiency. The single-stage PF and constant current controller eliminates passive circuitry required for power factor correction and electrolytic bulk capacitor. The advanced primary-side control techniques used by the LinkSwitch-PH device provide accurate constant current control while eliminating the need for an optocoupler and secondary-side current control circuitry.

LinkSwitch-PH incorporates a 725 V power MOSFET, a continuous-mode PWM controller, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry, all in a monolithic IC.

LinkSwitch-PH series main features:

Dramatically Simplifies Off-line LED Drivers

• LNK403-409 family is optimized for flicker-free operation in TRIAC dimming applications

• Single stage power factor corrected and accurate constant current (CC) output

• Eliminates optocoupler and all secondary current control circuitry

• Eliminates all control loop compensation circuitry

• Simple primary-side PWM dimming interface

• Universal input voltage range

• Enables designs that are electrolytic-free

Accurate and Consistent Performance

• Compensates for transformer inductance tolerances

• Compensates for line input voltage variations

• Frequency jittering greatly reduces EMI filter size and costs

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 EcoSmart™ – Energy Efficient

• Low standby power remote ON/OFF feature (<50 mW at 230 VAC)

• No current sense resistors – maximizes efficiency

• High efficiency operation, >85% achievable Green Package

• Halogen free and ROHS compliant package

LinkSwitch-PH series applications:

• Off-line LED driver
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 1. LinkSwitch-PH Family Block Diagram
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 2. Typical Application Circuit Diagram of LinkSwitch-PH Series
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 3. LinkSwitch-PH Series Isolated TRIAC Dimming Universal Input 14W LED Driver Block Diagram
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 4. LinkSwitch-PH Series Isolated Non-Dimming Universal Input 7W LED Driver Block Diagram

DER278 Reference Design: Electrolytic-less Capacitor-Free High Efficiency (greater than 90%), High Power Factor (greater than 0.9) 15W LED Driver Using LNK407EG

This document describes an isolated, power factor corrected, very high efficiency
LED driver designed to drive an LED string of 30 V at a current of 500 mA (both nominal)
from an input voltage range of 90 to 265 VAC.

The LED driver uses a LNK407EG device from the LinkSwitch-PH family of ICs. This
integrated controller and 725 V MOSFET dramatically reduces the complexity and
component count of the solution.

The key design goals were to achieve the highest possible efficiency and eliminate electrolytic capacitors. Both are key factors for increasing the lifetime and reliability of LED drivers making this solution ideal for industrial and commercial applications.

This document contains the LED driver specification, schematic, bill of material, transformer documentation and typical performance characteristics. The design was based on the reference design board RD-194 with simple component changes to meet the new specification.

DER278 Reference Design Key Features:

No electrolytic capacitors

Clean monotonic start-up – no output blinking

Fast start-up (<100 ms) – no perceptible delay

Highly energy efficient

o ≥90% at 230 VAC Low cost, low component count and small printed circuit board footprint solution

o No current sensing required

o Frequency jitter for smaller, lower cost EMI filter components Integrated protection and reliability features

o Output open circuit / output short-circuit protected with auto-recovery

o Line input overvoltage shutdown extends voltage withstand during line faults.

o Auto-recovering thermal shutdown with large hysteresis protects both components
and printed circuit board

o No damage during brown-out or brown-in conditions

Meets IEC 61000-4-5 ring wave, IEC 61000-3-2 Class C harmonics and EN55015 B
EMI conducted

Main specifications of the DER278 reference design:

PowerIntLNK407EG15WLED driver solution (DER278)
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 5. 15W LED Driver DER278 Reference Design Outline Drawing
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 6. 15W LED Driver DER278 Reference Design Circuit Diagram
15W LED Driver DER278 Reference Design Bill of Materials (BOM):

PowerIntLNK407EG15WLED driver solution (DER278)
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 7. Transformer circuit diagram
Transformer electrical indicators:

For details, see:
http://www.powerint.com/sites/default/files/product-docs/linkswitch-ph_family_datasheet.pdf
and
http://www.powerint.com/sites/default/files/PDFFiles/der278.pdf

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PowerInt’s LNK403-409EG/413-419EG LinkSwitch-PH series are LED drivers with PF>0.9, TRIAC dimming compatible (LNK403-409) and high efficiency, single-stage PF and constant current controllers that do not require PFC and electrolytic capacitors and other passive components. The device integrates 725V power MOSFET, continuous mode PWM controller, high voltage switching current source for self-biasing, cycle-by-cycle current limiting and hysteretic thermal shutdown circuit, mainly used in offline LED drivers. This article introduces LinkSwitch-PH Series Key Features, Block Diagram, Typical Application Circuit Diagram, Universal Input 7W and 14W LED Driver Block Diagram, and Capacitorless High Efficiency (greater than 90%), High Power Factor (greater than 0.9) 15W LED Driver Reference Design Using LNK407EG Key Features , circuit diagram, bill of materials.

LNK403-409EG/413-419EG LinkSwitch-PH Family

LED Driver IC, Single-Stage PFC, Primary-Side Constant Current Control and TRIAC Dimming/Non-Dimming Device Options

The LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring PF >0.9, TRIAC dimmer capability (LNK403-409) and high efficiency. The single-stage PF and constant current controller eliminates passive circuitry required for power factor correction and electrolytic bulk capacitor. The advanced primary-side control techniques used by the LinkSwitch-PH device provide accurate constant current control while eliminating the need for an optocoupler and secondary-side current control circuitry.

LinkSwitch-PH incorporates a 725 V power MOSFET, a continuous-mode PWM controller, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry, all in a monolithic IC.

LinkSwitch-PH series main features:

Dramatically Simplifies Off-line LED Drivers

• LNK403-409 family is optimized for flicker-free operation in TRIAC dimming applications

• Single stage power factor corrected and accurate constant current (CC) output

• Eliminates optocoupler and all secondary current control circuitry

• Eliminates all control loop compensation circuitry

• Simple primary-side PWM dimming interface

• Universal input voltage range

• Enables designs that are electrolytic-free

Accurate and Consistent Performance

• Compensates for transformer inductance tolerances

• Compensates for line input voltage variations

• Frequency jittering greatly reduces EMI filter size and costs

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 EcoSmart™ – Energy Efficient

• Low standby power remote ON/OFF feature (<50 mW at 230 VAC)

• No current sense resistors – maximizes efficiency

• High efficiency operation, >85% achievable Green Package

• Halogen free and ROHS compliant package

LinkSwitch-PH series applications:

• Off-line LED driver
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 1. LinkSwitch-PH Family Block Diagram
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 2. Typical Application Circuit Diagram of LinkSwitch-PH Series
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 3. LinkSwitch-PH Series Isolated TRIAC Dimming Universal Input 14W LED Driver Block Diagram
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 4. LinkSwitch-PH Series Isolated Non-Dimming Universal Input 7W LED Driver Block Diagram

DER278 Reference Design: Electrolytic-less Capacitor-Free High Efficiency (greater than 90%), High Power Factor (greater than 0.9) 15W LED Driver Using LNK407EG

This document describes an isolated, power factor corrected, very high efficiency
LED driver designed to drive an LED string of 30 V at a current of 500 mA (both nominal)
from an input voltage range of 90 to 265 VAC.

The LED driver uses a LNK407EG device from the LinkSwitch-PH family of ICs. This
integrated controller and 725 V MOSFET dramatically reduces the complexity and
component count of the solution.

The key design goals were to achieve the highest possible efficiency and eliminate electrolytic capacitors. Both are key factors for increasing the lifetime and reliability of LED drivers making this solution ideal for industrial and commercial applications.

This document contains the LED driver specification, schematic, bill of material, transformer documentation and typical performance characteristics. The design was based on the reference design board RD-194 with simple component changes to meet the new specification.

DER278 Reference Design Key Features:

No electrolytic capacitors

Clean monotonic start-up – no output blinking

Fast start-up (<100 ms) – no perceptible delay

Highly energy efficient

o ≥90% at 230 VAC Low cost, low component count and small printed circuit board footprint solution

o No current sensing required

o Frequency jitter for smaller, lower cost EMI filter components Integrated protection and reliability features

o Output open circuit / output short-circuit protected with auto-recovery

o Line input overvoltage shutdown extends voltage withstand during line faults.

o Auto-recovering thermal shutdown with large hysteresis protects both components
and printed circuit board

o No damage during brown-out or brown-in conditions

Meets IEC 61000-4-5 ring wave, IEC 61000-3-2 Class C harmonics and EN55015 B
EMI conducted

Main specifications of the DER278 reference design:

PowerIntLNK407EG15WLED driver solution (DER278)
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 5. 15W LED Driver DER278 Reference Design Outline Drawing
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 6. 15W LED Driver DER278 Reference Design Circuit Diagram
15W LED Driver DER278 Reference Design Bill of Materials (BOM):

PowerIntLNK407EG15WLED driver solution (DER278)
PowerIntLNK407EG15WLED driver solution (DER278)
Figure 7. Transformer circuit diagram
Transformer electrical indicators:

For details, see:
http://www.powerint.com/sites/default/files/product-docs/linkswitch-ph_family_datasheet.pdf
and
http://www.powerint.com/sites/default/files/PDFFiles/der278.pdf

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