LC5500

The LC5500 series is a quasi-resonant topology switching power supply IC, designed for input capacitorless applications, and making it possible for systems to comply with the harmonics standard (IEC61000-3-2 class C). It incorporates separate controller and power MOSFET chips. The controller adapts the average current control method for realizing high power factors, and the quasi-resonant topology contributes to high efficiency and low EMI noise. The series is housed in either DIP8 or TO-220F-7L (Sanken designator: FMY207) packages, depending on output power capability. The rich set of protection features helps to realize low component counts, and high performance-to-cost power supply.

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  • DIP8 package (LC551xD/LC552xD) and TO-220F-7L package (LC5523F)
  • Integrated on-width control circuit (it realizes high power factor by average current control)
  • Integrated startup circuit (no external startup circuit necessary)
  • Integrated soft-start circuit (reduces power stress during start-up on the incorporated power MOSFET and output diode)
  • Integrated bias assist circuit (improves the startup performance, suppresses VCC voltage droop during operation, allows reduction of VCC capacitor value as well as use of a ceramic capacitor)
  • Integrated Leading Edge Blanking (LEB) circuit
  • Integrated maximum on-time limit circuit
  • Dual-chip structure, with an avalanche-guaranteed power
  • MOSFET (allows simplified surge suppressing circuits)
  • Protection features:
    • Overcurrent protection (OCP): pulse-by-pulse
    • Overvoltage protection (OVP): intermittent oscillation operation,
      OVP-activating pins vary by product series:
        OVP-Activating Pins
      Series VCC ISENSE OVP OCP
      LC551xD × × ×
      LC552xD × × ×
      LC552xF × × ×
    • Overload protection (OLP): intermittent oscillation operation
    • Thermal shutdown (TSD): halts switching operation and latches in the off-state

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Packages

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
LC5511D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
Check Stock
LC5513D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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LC5521D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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LC5523D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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LC5523F LF3051 7-lead TO-220 -20°C to 85°C Yes View Data New Contact your
local sales rep
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LC5523F LF3052 7-lead TO-220 -20°C to 85°C Yes View Data New Contact your
local sales rep
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LC5523F LF3054 7-lead TO-220 -20°C to 85°C Yes View Data New Contact your
local sales rep
Check Stock
LC5525F LF3051 7-lead TO-220 -20°C to 85°C Yes View Data New Contact your
local sales rep
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LC5525F LF3052 7-lead TO-220 -20°C to 85°C Yes View Data New Contact your
local sales rep
Check Stock
LC5525F LF3054 7-lead TO-220 -20°C to 85°C Yes View Data New Contact your
local sales rep
Check Stock

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