NCP1565: PWM Controller, Highly Integrated Dual-Mode Active Clamp

Description: The NCP1565 is a highly integrated dual-mode activ...
  • The NCP1565 is a highly integrated dual-mode active-clamp PWM controller targeting next-generation high-density, high-performance and small to medium power level isolated dc-dc converters for use in telecom and datacom industries. It can be configured in either voltage mode control with input voltage feed-forward or peak current mode control. Peak current mode control may be implemented with input voltage feed forward as well. Adjustable adaptive overlap time optimizes system efficiency based on input voltage and load conditions. This controller integrates all the necessary control and protection functions to implement an isolated active clamp forward or asymmetric half-bridge converter. It integrates a high-voltage startup bias regulator. The NCP1565 has a line undervoltage detector, cycle-by-cycle current limiting, line voltage dependent maximum duty ratio limit, and programmable overtemperature protection using an external thermistor. It also includes a dual-function FLTSD pin used for communicating the presence of a fault but also for shutting down the controller.
  • Features
  • Both Voltage Mode Control and Current Mode Control - Flexible topology solution
  • Line feedforward - Stable constant crossover across input voltage range
  • Adaptive Overlap time Control - Extended ZVS across input & output operating conditions
  • Integrated 120 V HV Startup - Lossless startup and reduced Vcc capacitor via dynamic startup
  • Programmable Line Undervoltage Lockout (UVLO) with Adjustable Hysteresis - Safely limits operating input voltage range
  • Cycle by Cycle Peak Current Limiting - Increased converter robustness
  • Overcurrent Protection Based on Average Current - Precise output power limit
  • Programmable Duty Ratio Clamp - Efficiently prevents transformer saturation
  • Programmable Soft-Start - Lowers components stress at startup
  • Programmable Shutdown and Restart Delays - Robustness and flexibility of design
  • Programmable External Overtemperature Protection Using Thermistor - Robustness and flexibility of design
  • FLT/SD pin Used for Fault reporting and Shutdown Input - Good system integration
  • Programmable Oscillator with 1.5 MHz Maximum Frequency - Ready for high frequency designs
  • Main Switch Drive Capability of -2 A/3 A - Drive larger MOSFETs more efficiently
  • Active Clamp Switch Drive Capability of -2 A/1 A - More efficient drive capability
  • Short Circuit Protection
  • 5 V 2% Voltage Reference
  • VCC Range: from 6.5 V to 20 V
  • Applications
  • High Efficiency Isolated dc−dc Converters
  • Server Power Supplies
  • 24 V and 48 V Telecom systems
  • 42 V Automotive Applications
  • End Products
  • Telecom systems
  • Servers
  • Technical Documentation & Design Resources
    Evaluation/Development Tool Information
    Availability and Samples
    NCP1565MNTXG
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: PWM Controller, Highly Integrated Dual-Mode Active Clamp
  • Package Type: QFN-24
  • Package Case Outline: 485CW
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 4000
  • Applications
    Specifications
  • Topology: Forward 
  • Phases:
  • Control Mode: Current/Voltage Mode 
  • VCC Min (V): 6.5 
  • VCC Max (V): 20 
  • fSW Typ (kHz): Programmable up to 1.5Mhz 
  • Package Type: QFN-24 
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