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Peak-Current-Mode Controllers for Flyback and Boost Regulators

Enable Compact, Cost-Effective, and Highly Flexible Isolated/Nonisolated Power Supplies

Product Details

The MAX17595/MAX17596/MAX17597 is a family of peak-current-mode controllers for design of wide input-voltage flyback and boost regulators. The MAX17595 offers optimized input thresholds for universal input AC-DC converters and telecom DC-DC (36V to 72V input range) power supplies. The MAX17596/MAX17597 offer input thresholds suitable for low-voltage DC-DC applications (4.5V to 36V). The MAX17597 implements a boost converter. All three controllers contain a built-in gate driver for external n-channel MOSFETs.

The MAX17595/MAX17596/MAX17597 house an internal error amplifier with 1% accurate reference, eliminating the need for an external reference. The switching frequency is programmable from 100kHz to 1MHz with an accuracy of 8%, allowing optimization of magnetic and filter components, resulting in compact and cost-effective power conversion. For EMI-sensitive applications, the MAX17595/MAX17596/MAX17597 family incorporates a programmable frequency dithering scheme, enabling low-EMI spread-spectrum operation.

Users can start the power supply precisely at the desired input voltage, implement input overvoltage protection, and program soft-start time. A programmable slope compensation scheme is provided to ensuree stability of the peak-current-mode control scheme.

Hiccup-mode overcurrent protection and thermal shutdown are provided to minimize dissipation in overcurrent and overtemperature fault conditions.

Key Features

  • Programmable Switching Frequency Allows Optimization of the Magnetic and Filter Components, Resulting in Compact, Cost-Effective, Efficient Isolated/Non-Isolated Power Supplies
    • 100kHz to 1MHz Programmable Switching Frequency with Optional Synchronization
    • Peak Current Mode Control Provides Excellent Transient Response
      • Offline (Universal Input AC) and Telecom (36V to 72V) Flyback Controller—MAX17595
      • DC-DC (4.5V to 36V) Flyback Controller—MAX17596
      • Nonsynchronous (4.5V to 36V) Boost PWM Controller—MAX17597
    • 3mm x 3mm TQFN Package
  • Programmable Frequency Dithering Enables Low-EMI Spread-Spectrum Operation
  • Integrated Protection Features Enhance System Reliability
    • Adjustable Current Limit with External Current-Sense Resistor
    • Fast Cycle-By-Cycle Peak Current Limiting
    • Hiccup-Mode Short-Circuit Protection
    • Overtemperature Protection
    • Programmable Soft-Start and Slope Compensation
    • Input Overvoltage Protection

Applications/Uses

  • Battery-Powered Applications
  • Industrial and Telecom Applications
  • Universal Input Offline AC-DC Power Supplies
  • Wide-Range DC-Input Flyback/Boost Battery Chargers
Parametric specs for Isolated Power Supplies
VIN (V) (min) 4.5
VIN (V) (max) 36
Topology Flyback
Application (VIN) Base Station (24V)
Industrial (24V)
Control Loop Current Mode
Feedback Linear
Opto
Switching Frequency (kHz) 1000
Duty Cycle (%) (max) 48
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
$0.92 @1k
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 36
VOUT1 (V) (min) 5
VOUT1 (V) (max) 250
IOUT1 (A) (max) 4
Switch Type External
Output Adjust. Method Resistor
Power Good Signal Yes
ICC (mA) (typ) 2
Shutdown Mode Supply Current (µA) (typ) 20
Shutdown Mode Supply Current (µA) (max) 32
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Design Tools EE-Sim
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
$0.92 @1k
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Simplified Block Diagram

MAX17595, MAX17596, MAX17597:Startup Circuits MAX17595, MAX17596, MAX17597: Startup Circuits Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX17595 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains MAX17595 peak-current-mode controller for a flyback regulator. The EV kit is configured for an isolated 15V DC output voltage that can supply up to 1.5A current. The line input voltage range is from 85V AC to 265V AC or 120V DC to 375V DC.
The EV kit demonstrates low quiescent current and efficiency up to 86%. This high efficiency is achieved by using a single-transistor (MOSFET) flyback converter topology that operates at 120kHz switching frequency. The surface-mount transformer has a tertiary winding to power the IC after startup. An optocoupler, along with the transformer, provides galvanic isolation up to 3500VRMS.
Warning: The EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or the power sources connected to it must be careful to follow safety procedures appropriately to work with high-voltage electrical equipment.
Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this EV kit with care to avoid possible personal injury.

View Details

Features

  • 85V AC to 265V AC or 120V DC to 375V DC Input Range
  • 15V DC at 1.5A Isolated Output Voltage
  • Galvanic Isolation Up to 3500VRMS
  • 120kHz Switching Frequency
  • Efficiency Up to 86%
  • Low-Cost Flyback Design
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX17597 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board to evaluate the MAX17597 peak-current-mode controller in a step-up (boost) configuration. The EV kit output is configured for 24V output voltage that can supply up to 1A of current. The input voltage range is from 8V to 14V.
High efficiency up to 95.6% is achieved using a boost converter operating at a switching frequency of 600kHz, providing an output power up to 24W.

View Details

Features

  • 8V to 14V Input Range
  • Output Voltage: 24V at 1A
  • 600kHz Switching Frequency
  • Efficiency Up to 95.6%
  • Low-Cost Boost Converter Design
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX17597 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates an isolated 20W flyback DC-DC converter. The circuit uses the device’s peak-current-mode controller in a 16-pin TQFN package with an exposed pad. The EV kit demonstrates the IC’s cycle-by-cycle current-limit, soft-start, and EN/UVLO features.

The EV kit circuit output is configured for an isolated 24V and provides up to 833mA of output current. The EV kit is configured to operate at a 200kHz switching frequency. An optocoupler, along with the transformer, provides galvanic isolation between input and output, up to 1500VRMS.

View Details

Features

  • 18V to 36V Input Range
  • Isolated Output: 24V DC at 20W
  • Cycle-by-Cycle Current Limit
  • Resistor Programmable UVLO/OVI Threshold
  • Low-Cost Flyback Design
  • Galvanic Isolation Up to 1500VRMS
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX17596 evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates an isolated 20W fly-back DC-DC converter. The circuit uses the device’s peak current-mode controller in a 16-pin TQFN package with an exposed pad. The EV kit demonstrates the IC’s cycle-by-cycle current limit, soft-start, and EN/ UVLO features.

The EV kit circuit output is configured for an isolated +24V and provides up to 833mA of output current. The EV kit is configured to operate at a 200kHz switching frequency. An optocoupler, along with the transformer, provides galvanic isolation between the input and output, up to 1500VRMS.

View Details

Features

  • 18V to 36V Input Range
  • Isolated Output: 24V DC at 20W
  • Cycle-by-Cycle Current Limit
  • Resistor Programmable UVLO/OVI Threshold
  • Low-Cost Flyback Design
  • Galvanic Isolation Up to 1500VRMS
  • Proven PCB Layout
  • Fully Assembled and Tested

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Parameters

Parametric specs for Isolated Power Supplies
VIN (V) (min) 4.5
VIN (V) (max) 36
Topology Flyback
Application (VIN) Base Station (24V)
Industrial (24V)
Control Loop Current Mode
Feedback Linear
Opto
Switching Frequency (kHz) 1000
Duty Cycle (%) (max) 48
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
$0.92 @1k
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 36
VOUT1 (V) (min) 5
VOUT1 (V) (max) 250
IOUT1 (A) (max) 4
Switch Type External
Output Adjust. Method Resistor
Power Good Signal Yes
ICC (mA) (typ) 2
Shutdown Mode Supply Current (µA) (typ) 20
Shutdown Mode Supply Current (µA) (max) 32
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Design Tools EE-Sim
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
$0.92 @1k

Key Features

  • Programmable Switching Frequency Allows Optimization of the Magnetic and Filter Components, Resulting in Compact, Cost-Effective, Efficient Isolated/Non-Isolated Power Supplies
    • 100kHz to 1MHz Programmable Switching Frequency with Optional Synchronization
    • Peak Current Mode Control Provides Excellent Transient Response
      • Offline (Universal Input AC) and Telecom (36V to 72V) Flyback Controller—MAX17595
      • DC-DC (4.5V to 36V) Flyback Controller—MAX17596
      • Nonsynchronous (4.5V to 36V) Boost PWM Controller—MAX17597
    • 3mm x 3mm TQFN Package
  • Programmable Frequency Dithering Enables Low-EMI Spread-Spectrum Operation
  • Integrated Protection Features Enhance System Reliability
    • Adjustable Current Limit with External Current-Sense Resistor
    • Fast Cycle-By-Cycle Peak Current Limiting
    • Hiccup-Mode Short-Circuit Protection
    • Overtemperature Protection
    • Programmable Soft-Start and Slope Compensation
    • Input Overvoltage Protection

Applications/Uses

  • Battery-Powered Applications
  • Industrial and Telecom Applications
  • Universal Input Offline AC-DC Power Supplies
  • Wide-Range DC-Input Flyback/Boost Battery Chargers

Description

The MAX17595/MAX17596/MAX17597 is a family of peak-current-mode controllers for design of wide input-voltage flyback and boost regulators. The MAX17595 offers optimized input thresholds for universal input AC-DC converters and telecom DC-DC (36V to 72V input range) power supplies. The MAX17596/MAX17597 offer input thresholds suitable for low-voltage DC-DC applications (4.5V to 36V). The MAX17597 implements a boost converter. All three controllers contain a built-in gate driver for external n-channel MOSFETs.

The MAX17595/MAX17596/MAX17597 house an internal error amplifier with 1% accurate reference, eliminating the need for an external reference. The switching frequency is programmable from 100kHz to 1MHz with an accuracy of 8%, allowing optimization of magnetic and filter components, resulting in compact and cost-effective power conversion. For EMI-sensitive applications, the MAX17595/MAX17596/MAX17597 family incorporates a programmable frequency dithering scheme, enabling low-EMI spread-spectrum operation.

Users can start the power supply precisely at the desired input voltage, implement input overvoltage protection, and program soft-start time. A programmable slope compensation scheme is provided to ensuree stability of the peak-current-mode control scheme.

Hiccup-mode overcurrent protection and thermal shutdown are provided to minimize dissipation in overcurrent and overtemperature fault conditions.

Simplified Block Diagram

MAX17595, MAX17596, MAX17597:Startup Circuits MAX17595, MAX17596, MAX17597: Startup Circuits 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