ON Semiconductor

FAN7688SJX
Demoboard 6.6KW On Board EV Charger

Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control

Topology: LLC Resonant
Input Voltage (min.): 90.00 V
Input Voltage (max.): 264.00 V
Switching Frequency (min.): 36.00 kHz
Switching Frequency (max.): 735.00 kHz
Output 1: 450.00 V / 16.000 A

Original publication on 2019-04-05, revision 0.9 on

Description

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.

Characteristics

  • 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

Products

  Order Code SPEC Product series L
(µH)
IR
(A)
ISAT
(A)
fres
(MHz)
Montageart Pins Reihen Gender Typ Verpackung C
(pF)
Tol. C VR
(V (DC))
H
(mm)
Technische Artikelnummer Keramiktyp DF
(%)
Samples
74438343010 PDF WE-MAPI SMT Power Inductor 1 1.8 3.9 99 SMT
61300811021 PDF WR-PHD 2.54 mm THT Angled Pin Header 8 Single Pin Header Angled Bag
61300511021 PDF WR-PHD 2.54 mm THT Angled Pin Header 5 Single Pin Header Angled Bag
61300611021 PDF WR-PHD 2.54 mm THT Angled Pin Header 6 Single Pin Header Angled Bag
61301011021 PDF WR-PHD 2.54 mm THT Angled Pin Header 10 Single Pin Header Angled Bag
885012007057 PDF WCAP-CSGP MLCCs 0805 100 ±5% 50 0.6 NP00805101J050DFCT10000
885012007059 PDF WCAP-CSGP MLCCs 0805 220 ±5% 50 0.6 NP00805221J050DFCT10000
885012007061 PDF WCAP-CSGP MLCCs 0805 470 ±5% 50 0.8 NP00805471J050DFCT10000 NP0 Class I
885012007051 PDF WCAP-CSGP MLCCs 0805 10 ±5% 50 0.6 NP00805100J050DFCT10000
885012207076 PDF WCAP-CSGP MLCCs 0805 470 ±10% 25 1.25 X7R0805474K025DFCT10000 X7R Class II 3.5
885012207074 PDF WCAP-CSGP MLCCs 0805 220 ±10% 25 1.25 X7R0805224K025DFCT10000 X7R Class II 3.5
885012207072 PDF WCAP-CSGP MLCCs 0805 100 ±10% 25 0.8 X7R0805104K025DFCT10000 X7R Class II 3.5
885012207052 PDF WCAP-CSGP MLCCs 0805 2.2 ±10% 16 1.25 X7R0805225K016DFCT10000 X7R Class II 10
885012208069 PDF WCAP-CSGP MLCCs 1206 10 ±10% 25 1.6 X7R1206106K025DFCT10000 X7R Class II 10
885012208094 PDF WCAP-CSGP MLCCs 1206 4.7 ±10% 50 1.6 X7R1206475K050DFCT10000 X7R Class II 10
885012207092 PDF WCAP-CSGP MLCCs 0805 10 ±10% 50 0.8 X7R0805103K050DFCT10000 X7R Class II 2.5
885012207096 PDF WCAP-CSGP MLCCs 0805 47 ±10% 50 0.8 X7R0805473K050DFCT10000 X7R Class II 2.5
885012207090 PDF WCAP-CSGP MLCCs 0805 4.7 ±10% 50 0.8 X7R0805472K050DFCT10000 X7R Class II 2.5
885012207088 PDF WCAP-CSGP MLCCs 0805 2.2 ±10% 50 0.8 X7R0805222K050DFCT10000 X7R Class II 2.5
885012207086 PDF WCAP-CSGP MLCCs 0805 1 ±10% 50 0.8 X7R0805102K050DFCT10000 X7R Class II 2.5
885012207079 PDF WCAP-CSGP MLCCs 0805 2.2 ±10% 25 1.25 X7R0805225K025DFCT10000 X7R Class II 10