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High-Frequency, Current-Mode PWM Controller with Accurate Oscillator and Dual FET Drivers

2.5MHz, Universal-Input, Dual-Output PWM Controller with Precision-Programmable Switching Frequency and Start/Stop Voltage

Product Details

Key Features

Parametric specs for Isolated Power Supplies
VIN (V) (min) 10.8
Topology Full-Bridge
Half-Bridge
Push-Pull
Application (VIN) Base Station (24V)
Industrial (24V)
Networking (48V)
Power Over Ethernet (32-58V)
Telecom (36-72V)
Universal Off-line (90-240VAC)
Control Loop Current Mode
Feedback Linear
Opto
Switching Frequency (kHz) 2500
Duty Cycle (%) (max) 50
Oper. Temp. (°C) -40 to +125
Package/Pins TSSOP/16
Budgetary
Price (See Notes)
4.8
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Simplified Block Diagram

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Parameters

Parametric specs for Isolated Power Supplies
VIN (V) (min) 10.8
Topology Full-Bridge
Half-Bridge
Push-Pull
Application (VIN) Base Station (24V)
Industrial (24V)
Networking (48V)
Power Over Ethernet (32-58V)
Telecom (36-72V)
Universal Off-line (90-240VAC)
Control Loop Current Mode
Feedback Linear
Opto
Switching Frequency (kHz) 2500
Duty Cycle (%) (max) 50
Oper. Temp. (°C) -40 to +125
Package/Pins TSSOP/16
Budgetary
Price (See Notes)
4.8

Key Features

  • Current-Mode Control with 47µA (typ) Startup Current
  • Oscillator Frequency Programmable to 2.5MHz
  • Resistor-Programmable ±4.5% Accurate Switching Frequency
  • Dual Gate-Drive Output for Half/Full-Bridge or Push-Pull Applications
  • Rectified 85VAC to 265VAC, or 36VDC to 72VDC Input (MAX5069A/B)
  • Input Directly Driven from 10.8V to 24V (MAX5069C/D/E)
  • Programmable Dead Time and Slope Compensation
  • Programmable Startup Voltage (UVLO)
  • Programmable UVLO Hysteresis (MAX5069B/C/E)
  • Frequency Synchronization Input (MAX5069A/D)
  • -40°C to +125°C Automotive Temperature Range
  • 16-Pin Thermally Enhanced TSSOP-EP Package

Applications/Uses

  • Industrial Power Conversion
  • Isolated Telecom Power Supplies
  • Networking System Power Supplies
  • Server Power Supplies
  • Universal-Input AC Power Supplies

Description

The MAX5069 is a high-frequency, current-mode, pulse-width modulation (PWM) controller (with dual MOSFET drivers) that integrates all the building blocks necessary for implementing AC-DC or DC-DC fixed-frequency power supplies. Isolated or nonisolated pushpull and half/full-bridge power supplies are easily constructed using either primary- or secondary-side regulation. Current-mode control with leading-edge blanking simplifies control-loop design and a programmable internal slope-compensation circuit stabilizes the current loop when operating at duty cycles above 50%.

An input undervoltage lockout (UVLO) programs the input-supply startup voltage and ensures proper operation during brownout conditions.

A single external resistor programs the oscillator frequency from 50kHz to 2.5MHz. The MAX5069A/D provide a SYNC input for synchronization to an external clock. The maximum FET-driver duty cycle for the MAX5069 is 50%. Programmable dead time allows additional flexibility in optimizing magnetic design and overcoming parasitic effects. Programmable hiccup current limit provides additional protection under severe faults.

The MAX5069 is specified over the -40°C to +125°C automotive temperature range and is available in a 16-pin thermally enhanced TSSOP-EP package. Refer to the MAX5068 data sheet for single FET-driver applications.

Warning: The MAX5069 is designed to work with high voltages. Exercise caution.

Simplified Block Diagram

MAX5069: Functional Diagram MAX5069: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.