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AC-DC LED Drivers | FL7734

LED Driver, Single-Stage Primary-Side-Regulation PWM Controller for PFC and Phase Cut Dimmable LED Applications

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Overview

The FL7734 is a highly integrated PWM controller with advanced Primary-Side-Regulation (PSR) technique to minimize components for low power LED lighting solutions. Using the innovative TRUECURRENT technology for tight constant-current control, it enables designs with constant-current (CC) tolerance of less than ±1% in the wide line voltage range to meet stringent LED brightness requirements.
FL7734 can operate with all types of phase cut dimmers. Phase cut dimming is managed smoothly by bleeding current control to achieve excellent dimmer compatibility without flicker.
The controller can automatically detect whether there is a dimmer connection. In non dimming mode, the operating mode is set to optimize power factor and THD by enabling linear frequency control and voltage mode based on DCM.
An external high-voltage bleeding circuit is utilized to implement fast startup and high system efficiency. The FL7734 also provides powerful protections, such as LED open / short, sensing resistor shorted, and over-temperature for high system reliability. The FL7734 is available in 16-pin Small-Outline Package (SOP).

  • Lighting
  • LED Lighting – Low Power – Phase-cut dimming
  • LED Lighting – Mid Power – Phase-cut dimming
  • LED Lighting – High Power – Phase-cut dimming

  • Excellent Dimmer Compatibility by Active Dimming Control
  • Programmable Dimming Curve and Input Current Management
  • Constant LED Current Regulation in Large Phase Angle Range
  • Cost-Effective Solution without Input Bulk Capacitor and Feedback Circuitry
  • Accurate Constant-Current (CC) Control, Independent on Line Voltage, Output Voltage, Magnetizing Inductance Variation
  • Power Factor Correction (PFC)
  • Fast Startup utilizing Bleeding Circuit
  • Open-LED Protection
  • Short-LED Protection
  • Sensing Resistor Short Protection
  • Cycle-by-Cycle Current Limiting
  • Over-Temperature Protection with Auto Restart

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FL7734MX

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CAD Model

Pb

A

H

P

SOIC-16

751BG

3

260

REEL

2500

Y

PSR PFC Flyback

27.5

308 VAC

18 VGATE

60/180 mA - Source/Sink

70

$0.6013

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Reliability Data

Die Related Summary Data

Device: FL7734MX

Equivalent to wafer fab process: CN

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Equivalent Device-Hours

MTBF/MTTF in Hours

FITS

CN

6

425600109

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Re-calculate Data

Data is based on the following assumptions.

Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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