FAN7688

Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control

The FAN7688 is an advanced Pulse Frequency Modulated (PFM) controller for LLC resonant converters with Synchronous Rectification (SR) that offers best in class efficiency for isolated DC/DC converters. It employs a current mode control technique based on a charge control, where the triangular waveform from the oscillator is combined with the integrated switch current information to determine the switching frequency. This provides a better control-to-output transfer function of the power stage simplifying the feedback loop design while allowing true input power limit capability. Closed-loop soft-start prevents saturation of the error amplifier and allows monotonic rising of the output voltage regardless of load condition. A dual edge tracking adaptive dead time control minimizes the body diode conduction time thus maximizing efficiency.

Features

  • Secondary Side PFM Controller for LLC Resonant Converter with Synchronous Rectifier Control
  • Charge Current Control for Better Transient Response and Easy Feedback Loop Design
  • Adaptive Synchronous Rectification Control with Dual Edge Tracking
  • Closed Loop Soft-Start for Monotonic Rising Output
  • Wide Operating Frequency (39 kHz ~ 690 kHz)
  • Green Functions to Improve Light-Load Efficiency
  • - Symmetric PWM Control at Light-Load to Limit the Switching Frequency while Reducing Switching Losses - Disabling SR at Light-Load Condition
  • Protection Functions with Auto-Restart
  • - Over-Current Protection (OCP) - Output Short Protection (OSP) - NON Zero-Voltage Switching Prevention (NZS) by Compensation Cutback (Frequency Shift) - Power Limit by Compensation Cutback (Frequency Shift) - Overload Protection (OLP) with Programmable Shutdown Delay Time - Over-Temperature Protection (OTP)
  • Programmable Dead Times for Primary Side Switches and Secondary Side Synchronous Rectifiers
  • VDD Under-Voltage Lockout (UVLO)
  • Wide Operating Temperature Range -40°C to +125°C
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Product Product &
Eco Status
Unit Price/
1K Order
Packing Method Convention Package Marking
Convention*
Qualification
Support
Compliance
Certificates
FAN7688SJX Full Production
Green as of Apr 2014
 China RoHS
$1.764

SOP 16L  -  Details
1.8 x 5.3 x 10.2mm,  TAPE REEL

PDF SOP 16L  Drawing
Last Update: Nov 2015 PDF M16D SOP EIAJ 16L, Packing Drawing
Last Update: Jan 2016 PDF SOIC TUBE Packing Drawing
Last Update: Dec 2016
Line 1$Y (Fairchild logo)
&Z (Plant Code)
&2 (2-Digit Date Code)
&K

Line 2FAN7688

FIT [Calculate] 1.34 @55°C
MTBF 7.48E8

ESD (CDM) 2000V

ESD (HBM) 3000V

RƟJA 102°C/W

Moisture Sensitivity Level (MSL) 1

Max Reflow Temp 260

PDF RoHS IPC1752
XML RoHS IPC1752
PDF RoHS/REACH/JIG
PDF China RoHS

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  • Desktop PC
  • Fully Configured Entry Level PC Server
  • Game Console
  • High Efficiency SMPS
  • Industrial Power
  • LCD TV
  • LED TV
  • PC Server
  • PDP TV
Application Document Number Featured Products Output
Power
Input
Voltage
Topology
Power Supply for Audio Amplifier PDFRD-573
1000 W 176 - 264 VAC Interleaved BCM PFC, LLC with SR, Flyback
Application Note Description
AN-6104 PDFLLC Resonant Converter Design using FAN7688
Last Update : 29-Dec-2015

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Product
Ea
(0.3 - 1.4)
Confidence
(0.6-0.9)
T use (°C)
T Stress (°C)
Kt (eV/K)
Device Hours
@ T Stress
(devices*hours)
Rejects
(devices)
Chi
Square
Acceleration
Factor
FIT @ T use
MTBF @ T
use (hours)
FAN7688SJX 0.7 0.6 55 150 8.62E-05 5836595.82 1 4.04 259.24 1.34
Run new FIT calculation
7.48E8