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FAN6248HCMX

Advanced SR controller for LLC, adaptive turn-off, 16-SOIC, up to 500kHz

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Manufacturer Part：

FAN6248HCMX

Package：

16-SOIC (10.3 x 7.5 x 2.65 mm)

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Description

Product Overview

The FAN6248HCMX from onsemi is an advanced synchronous rectifier (SR) controller designed for LLC resonant converters. Packaged in a 16-SOIC, it features adaptive virtual turn-off threshold and predictive gate drive timing for high-efficiency secondary-side rectification.

Key Specifications

Topology LLC Resonant SR Controller
Supply Voltage 4.5V ~ 35V
Operating Frequency Up to 500kHz
Gate Drive Output 4A source / 6A sink
Operating Temperature -40°C ~ 125°C
Package 16-SOIC
Features Adaptive virtual turn-off threshold
Version HCMX (High-Side / Common-Mode)

Features

  • Adaptive virtual turn-off threshold with 16-step offset modulation
  • Predictive gate drive timing for minimum body diode conduction
  • Dead-time optimization for LLC converters
  • VDR drain sensing for accurate SR timing
  • Supports both high-side and low-side SR configurations
  • Under-voltage lockout and thermal shutdown

Applications

  • LLC resonant converter synchronous rectification
  • Server and telecom AC-DC power supplies
  • High-efficiency adapter and charger designs
  • TV and monitor power supplies
  • Industrial power conversion

The FAN6248HCMX from onsemi is a highly integrated synchronous rectifier controller optimized for LLC resonant converter secondary-side rectification. It uses an adaptive virtual turn-off threshold scheme with a 16-step offset voltage modulation to precisely time the SR MOSFET turn-off, minimizing body diode conduction time and maximizing efficiency. The controller supports both high-side and common-mode SR MOSFET configurations. Its predictive gate drive capability anticipates the zero-crossing point of the SR current, enabling near-ideal diode emulation in the variable-frequency LLC operating regime.

The FAN6248 monitors the drain-source voltage (VDR) of the SR MOSFET to detect current direction. When the secondary-side current begins flowing through the body diode (VDR negative), the controller turns on the SR MOSFET. The turn-off timing is determined by the adaptive virtual turn-off threshold: a 16-step offset voltage is modulated to compensate for parasitic inductance and MOSFET RDS(on) variations. If the dead time between SR turn-off and primary switch turn-on exceeds 200ns, the offset decreases by one step in the next cycle, reducing the dead time. This closed-loop adaptation ensures optimal SR timing across load and line conditions.

Pin Name Type Function
1 VDD Power Supply voltage (4.5-35V)
2 NC – No connect
3 EN Input Enable input
4 VDR Input Drain voltage sensing
5 CS Input Current sense input
6 AGND Power Analog ground
7 NC – No connect
8 PGND Power Power ground
9 GATE Output Gate drive output
10 VCC Power Internal supply bypass
11-16 NC/PGND – No connect / Power ground
  • LLC resonant converter secondary-side synchronous rectification
  • 80Plus Titanium server power supply SR stages
  • High-density AC-DC adapter and charger platforms
  • TV and LED display power supply SR control
  • Industrial DC-DC converter output rectification
Manufacturer Part Number Package Notes
onsemi FAN6248HLMX 16-SOIC Low-side SR version
onsemi NCP4305DR2G 8-SOIC SR controller, simpler
TI UCC24610 8-VSSOP SR controller for LLC
Infineon XDPS2221 PG-DSO-8 SR controller, LLC optimized
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Quality Assurance

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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