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Power Factor Correction Flyback Controller for Front-End Power Conversion in Commercial SSL Lighting


High PF, < 10% THD at Full Load and IEC61000-3-2 Compliant, Integrated Startup Device

The iW3677 front-end flyback power factor correction device provides high power factor (PF > 0.9) and low THD (< 20%) down to 33% load current using Dialog’s PF-Boost™ technology. The device can be configured in both isolated and non-isolated configurations, as a buck, buck-boost or flyback converter and consumes less than 150mW no-load standby power at 230VAC. The iW3677 integrates a high-voltage startup device which also reduces standby power consumption during normal operation.

The iW3677 integrates a full range of protection features including output over-voltage, over-power, input over-voltage and under-voltage, over-current and sense resistor short circuit protection, open loop and over temperature protection.

For option without integrated high-voltage startup, see iW3671.

Lifecycle status

● Active


90W Off-Line Controller Supports Isolated and Non-isolated Flyback, Buck and Buck-Boost

Integrated High-Voltage Startup Device

PF > 0.9 and THD < 20% Across Input Voltage at Output Power > 33%

  • THD < 10% at Full Load, Across the Input Voltage Range

Supports Wide AC Input Voltage – 90VAC to 305VAC with Tight AC Load and Line Regulation (±3%)

Fast PFC Ready Time < 0.2s

Standby Power - <150mW at Input Voltage of 230VAC

Fully Protected

  • Output Over-Voltage, Over-Power, Over-Current, Sense-Resistor Short Protections
  • Input Voltage Under-Voltage and Over-Voltage Protection
  • Built-In Over-Temperature Protection
  • Open Loop Protection


Commercial Lighting: 

  • External Fixture Drivers

Block Diagrams


Typical Applications Diagram


Functional Block Diagram

To order a sample of any of our products, please complete the following form. We will provide up to five parts free of charge. Our sales department will provide pricing for samples orders exceeding five parts.

Sample Request Form

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Inquiries Distributors and Representatives Register for newsletters
Name Date Version
iW3677 Datasheet (2.33 MB) (Registered users only) 19/02/2021 0.81
iW3677 Datasheet_SChinese (2.57 MB) (Registered users only) 17/02/2021 0.5
Product Brief
Name Date Version
iW3677 Product Summary (494.66 KB) 17/02/2021 0.6
iW3677 Product Summary (Chinese) (539.02 KB) 17/02/2021 0.2
Ref. Design and Dev. Kit Documentation
Name Date Version
Reference Design EBC20057: iW3677-00, 90V-305VAC Input, 24V/1.25A Output, ER2518 SSL LED Driver Design (8.16 MB) (Registered users only) 06/10/2020 1.0
Reference Design EBC20063: iW3677-00 and iW3638-01 and iW350-00, 40V/1.5A, 0-10V Dimmable SSL LED Driver Design (13.91 MB) (Registered users only) 06/10/2020 1.0
Reference Design EBC20072: iW3677-00, iW380-00, iW350-30, 54V/1.05A, 0-10V Dimmable SSL Driver Design (6.08 MB) (Registered users only) 25/11/2021 1.0
Reference Design EBC20076: iW3677-00, iW380-31, iW350-31, 18-54V, Max 55W Constant Power, 0-10V Dimmable SSL Driver Design (6.25 MB) (Registered users only) 25/11/2021 1.0