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AC-DC LED Drivers | FL7921R

Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Lighting Controller

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Overview

The highly integrated FL7921R combines a Power Factor Correction (PFC) controller and a Quasi-Resonant PWM controller. Integration provides cost-effect design and allows for fewer external components.
For PFC, FL7921R uses a controlled on-time technique to provide a regulated DC output voltage and to perform natural power factor correction. An innovative THD optimizer reduces input current distortion at zero-crossing duration to improve THD performance. The PFC function is always on regardless of the PWM stage load condition to ensure that high PF can be achieved at light load condition.
For PWM, FL7921R provides several functions to enhance power system performance: valley detection, green-mode operation, high / low line over-power compensation. Protection functions include secondary-side open-loop and over-current with auto-recovery protection, external recovery triggering, adjustable over-temperature protection through the RT pin and external NTC resistor, internal over-temperature shutdown, VDD pin OVP, DET pin over-voltage for output OVP, and brown-in / out for AC input voltage UVP. All protections are auto recovery mode except PWM current sense pin open protection.

  • Integrated PFC and Flyback Controller
  • Critical-Mode PFC Controller
  • Zero-Current Detection for PFC Stage
  • Quasi-Resonant Operation for PWM Stage
  • Internal Minimum tOFF 8 µs for QR PWM Stage
  • Internal 9.5 ms Soft-Start for PWM
  • Brownout Protection
  • High / Low Line Over-Power Compensation
  • Auto Recovery Over-Current Protection
  • Auto Recovery Open-Loop Protection
  • Auto Recovery Over-Temperature Protection
  • Adjustable Over-Temperature with external NTC through the RT pin
  • Auto Recovery VDD Pin and Output Voltage OVP

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FL7921RMX

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CAD Model

Pb

A

H

P

SOIC-16

751BG

3

260

REEL

2500

Y

PFC and PWM(QR Flyback) Combo

50

500

19 VGATE

80/40 ns - Rise/Fall time

Variable

$0.6332

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Reliability Data

Die Related Summary Data

Device: FL7921RMX

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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