Automotive Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control

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Overview

The NCV4390 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.

  • Half-Bridge and Full-Bridge Converters
  • ON-Board-Chargers
  • xEV High Voltage Converters
  • Charge Current Control
  • Adaptive SR with Dual edge Tracking
  • Green Functions, provide wider PWM mode entry level including PWM disable
  • Closed Loop Soft-Start
  • Programmable dead times
  • Non-ZVS Protection
  • Protection Functions with Auto-Restart- Over-Current Protection (OCP)- Output Short Protection (OSP)- Power Limit by Compensation Cutback (Frequency Shift)- Overload Protection (OLP) with Programmable Shutdown Delay Time- Over-Temperature Protection (OTP)
  • Wide Operating Frequency (39 kHz ~ 690 kHz)
  • AEC Qualified

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Control Mode

fsw Typ (kHz)

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NCV4390DR2G

Active

Pb

A

H

P

SOIC-16

1

260

REEL

2500

Y

Half-Bridge

Current Mode

Up to 690

Yes

8.6 V

Yes

No

Yes

20

100 / 100

$1.4991

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