The NCP13994 is a high performance current mode controller for

half bridge resonant converters. This controller implements

700 V gate drivers, simplifying layout and reducing external

component count. The built?in Brown?Out input function eases

implementation of the controller in all applications. In applications

where a PFC front stage is needed, the NCP13994 features a dedicated

output to drive the PFC controller. This feature together with quiet

skip mode technique further improves light load efficiency of the

whole application. The NCP13994 provides a suite of protection

features allowing safe operation in any application. This includes:

overload protection, over?current protection to prevent hard switching

cycles, brown?out detection, line brown?out, line OVP, X2 cap

discharge, open optocoupler detection, automatic dead?time adjust,

over?voltage (OVP) and over?temperature (OTP) protections.

特性 Features

? Up to 700 V Operating Range for High Side Driver

? Up to 700 V Operating Range for HV Startup Current Source

? Line Brown?out and OVP Protections

? X2 Cap Discharge Function

? Clamped Output Drivers

? Up to 30 V Supply

? High?Frequency Operation from 20 kHz up to 750 kHz

? Current Mode Control Scheme

? Automatic Dead?time with Maximum Dead?time Clamp

? Enhanced Startup Sequence for Fast Resonant Tank Stabilization

? Light Load Operation Mode for Improved Efficiency

? Quiet Skip Operation Mode for Minimize Transformer Acoustic

Noise

? Off?mode Operation for Extremely Low No?load Consumption

? Latched or Auto?recovery Overload Protection

? Latched or Auto?recovery Output Short Circuit Protection with

Current Reduction

? Latched Input for Severe Fault Conditions, e.g. OVP or OTP

? Out of Resonance Switching Protection

? Open Feedback Loop Protection

? Precise Brown?out Protection

? PFC Stage Operation Control According to Load Conditions

? Startup Current Source with Extremely Low Leakage Current

? Dynamic Self?Supply (DSS) Operation in Off?mode or Fault Modes

Features (continued)

? Pin to Adjacent Pin / Open Pin Fail Safe

? This is a Pb?Free Device

Typical Applications

? Adapters and Offline Battery Chargers

? Flat Panel Display Power Converters

? Computing Power Supplies

? Industrial and Medical Power Sources