NCP4390 Series

Resonant Controller with Synchronous Rectifier Control, Enhanced Light Load

Catalog

Resonant Controller with Synchronous Rectifier Control, Enhanced Light Load

Part	Mounting Type	Current - Supply	Supplier Device Package	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case	Package / Case [x]	Package / Case [y]	Applications	Voltage - Supply [Max]	Voltage - Supply [Min]
ON Semiconductor NCP4390DR2G	Surface Mount	2.8 mA	16-SOIC	-40 °C	125 ¯C	16-SOIC	0.154 in	3.9 mm	Secondary-Side Controller Synchronous Rectifier	18 V	0 V

Catalog

Resonant Controller with Synchronous Rectifier Control, Enhanced Light Load

Key Features

• 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

• Wide Operating Frequency (39 kHz ~ 690 kHz)

• 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 Temperature Range -40°C to +125°C

Description

The NCP4390 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.