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MAX5019, MAX5020
Current-Mode PWM Controllers with Integrated Startup Circuit


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 336kB)
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The MAX5019/MAX5020 integrate all the building blocks necessary for implementing DC-DC fixed-frequency power supplies. Either primary- or secondary-side regulation may be used to implement isolated or nonisolated power supplies. These devices are current-mode controllers with an integrated high-voltage startup circuit suitable for telecom/industrial voltage range power supplies. Current-mode control with leading-edge blanking simplifies control-loop design and internal ramp compensation circuitry stabilizes the current loop when operating at duty cycles above 50% (MAX5019). The MAX5019 allows 85% operating duty cycle and can be used to implement flyback converters whereas the MAX5020 limits the operating duty cycle to less than 50% and can be used in single-ended forward converters. A high-voltage startup circuit allows these devices to draw power directly from the 18V to 110V input supply during startup. The switching frequency is internally trimmed to 275kHz ±10%, thus reducing magnetics and filter component costs.

The MAX5019/MAX5020 are available in 8-pin SO packages.

Warning: The MAX5019/MAX5020 operate with high voltages. Exercise caution.

Key Features   Applications/Uses
  • Wide Input Range: (18V to 110V) or (13V to 36V)
  • Isolated (without optocoupler) or nonisolated power supply
  • Current-Mode Control
  • Leading-Edge Blanking
  • Internally Trimmed 275kHz ±10% Oscillator
  • Low External Component Count
  • Soft-Start
  • High-Voltage Startup Circuit
  • Pulse-by-Pulse Current Limiting
  • Thermal Shutdown
  • SO-8 Package
 
  • Industrial Power Supplies
  • Isolated Power Supplies
  • Networking Power Supplies
  • Telecom Power Supplies

Key Specifications:  Isolated Power Supplies
Part Number VIN
(V)
VIN
(V)
Topology Features Cntrl. Loop Feedback Freq.
(kHz)
Duty Cycle
(%)
ICC
(mA)
Gate Drive Current
(A)
Oper. Temp.
(°C)
Price
min max min max max max See Notes
MAX5019  13 110 Flyback
High Voltage Start-Up Circuit
Internal Error Amplifier
Thermal Shutdown
UVLO
Current Mode
Linear
Opto
275 85 1.6 1
-40 to +85
0 to +70
$0.75 @1k
MAX5020  Single-Ended Forward 50 $0.75 @1k
See All Isolated Power Supplies (31)

Diagram
MAX5019, MAX5020: Typical Operating Circuit
Typical Operating Circuit

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    Document Ref.: 19-2115; Rev 0; 2001-07-01
    This page last modified: 2007-06-26


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