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

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 Pins Reihen Gender Typ IR
(A)
Verpackung L
(µH)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Montageart C
(pF)
Tol. C VR
(V (DC))
Bauform H
(mm)
Technische Artikelnummer Keramiktyp DF
(%)
Samples
61301011021 PDF WR-PHD 2.54 mm THT Angled Pin Header 10 Single Pin Header Angled 3 Bag
61300811021 PDF WR-PHD 2.54 mm THT Angled Pin Header 8 Single Pin Header Angled 3 Bag
61300511021 PDF WR-PHD 2.54 mm THT Angled Pin Header 5 Single Pin Header Angled 3 Bag
61300611021 PDF WR-PHD 2.54 mm THT Angled Pin Header 6 Single Pin Header Angled 3 Bag
74438343010 PDF WE-MAPI SMT Power Inductor 1.8 1 3.9 86 104 99 SMT
885012007057 PDF WCAP-CSGP MLCCs 50 V(DC) 100 ±5% 50 0805 0.6 NP00805101J050DFCT10000
885012007059 PDF WCAP-CSGP MLCCs 50 V(DC) 220 ±5% 50 0805 0.6 NP00805221J050DFCT10000
885012007051 PDF WCAP-CSGP MLCCs 50 V(DC) 10 ±5% 50 0805 0.6 NP00805100J050DFCT10000
885012007061 PDF WCAP-CSGP MLCCs 50 V(DC) 470 ±5% 50 0805 0.8 NP00805471J050DFCT10000 NP0 Class I
885012208069 PDF WCAP-CSGP MLCCs 25 V(DC) 10 ±10% 25 1206 1.6 X7R1206106K025DFCT10000 X7R Class II 10
885012208094 PDF WCAP-CSGP MLCCs 50 V(DC) 4.7 ±10% 50 1206 1.6 X7R1206475K050DFCT10000 X7R Class II 10
885012207092 PDF WCAP-CSGP MLCCs 50 V(DC) 10 ±10% 50 0805 0.8 X7R0805103K050DFCT10000 X7R Class II 2.5
885012207096 PDF WCAP-CSGP MLCCs 50 V(DC) 47 ±10% 50 0805 0.8 X7R0805473K050DFCT10000 X7R Class II 2.5
885012207076 PDF WCAP-CSGP MLCCs 25 V(DC) 470 ±10% 25 0805 1.25 X7R0805474K025DFCT10000 X7R Class II 3.5
885012207074 PDF WCAP-CSGP MLCCs 25 V(DC) 220 ±10% 25 0805 1.25 X7R0805224K025DFCT10000 X7R Class II 3.5
885012207072 PDF WCAP-CSGP MLCCs 25 V(DC) 100 ±10% 25 0805 0.8 X7R0805104K025DFCT10000 X7R Class II 3.5
885012207090 PDF WCAP-CSGP MLCCs 50 V(DC) 4.7 ±10% 50 0805 0.8 X7R0805472K050DFCT10000 X7R Class II 2.5
885012207088 PDF WCAP-CSGP MLCCs 50 V(DC) 2.2 ±10% 50 0805 0.8 X7R0805222K050DFCT10000 X7R Class II 2.5
885012207086 PDF WCAP-CSGP MLCCs 50 V(DC) 1 ±10% 50 0805 0.8 X7R0805102K050DFCT10000 X7R Class II 2.5
885012207079 PDF WCAP-CSGP MLCCs 25 V(DC) 2.2 ±10% 25 0805 1.25 X7R0805225K025DFCT10000 X7R Class II 10
885012207052 PDF WCAP-CSGP MLCCs 16 V(DC) 2.2 ±10% 16 0805 1.25 X7R0805225K016DFCT10000 X7R Class II 10