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TOP233P - TOPSwitch-FX Offline Switching IC

The TOP233P is a high-performance, integrated offline switching IC from Power Integrations' TOPSwitch-FX family. Designed for flyback topology AC/DC power supplies up to 25W, this controller combines a 700V power MOSFET, oscillator, high-voltage switched current source, current limit, and shutdown circuitry onto a single monolithic device.

Key Features & Benefits

  • Integrated Design: Reduces component count and simplifies power supply design
  • Wide Frequency Range: 66kHz to 132kHz switching frequency for flexible design optimization
  • Comprehensive Protection: Built-in current limiting, over-temperature, and over-voltage protection
  • High Efficiency: 78% duty cycle enables compact transformer designs
  • Reliable Performance: -40°C to 150°C junction temperature range for demanding applications
  • Industry Standard Package: Through-hole 8-DIP mounting for easy prototyping and production

Typical Applications

  • AC/DC power adapters and chargers
  • Standby power supplies
  • Auxiliary power supplies
  • Consumer electronics
  • Industrial control systems
  • LED lighting drivers

Why Choose TOP233P?

The TOP233P offers exceptional value for power supply designers seeking a reliable, cost-effective solution. Its integrated protection features ensure safe operation, while the proven TOPSwitch-FX architecture delivers consistent performance across a wide range of operating conditions. Backed by Power Integrations' reputation for quality and long-term product availability, the TOP233P is an ideal choice for both new designs and legacy system support.

Part Number: TOP233P | Package: 8-PDIP-B | RoHS Compliant

Product attributes Property Value
Manufacturer Power Integrations
Product Series TOPSwitch®-FX
Packaging |
Output Isolation Isolated
Internal Switch(s) Yes
Voltage - Breakdown 700V
Topology Flyback
Voltage - Start Up -
Voltage - Supply (Vcc/Vdd) -
Duty Cycle 78%
Frequency - Switching 66kHz ~ 132kHz
Power (Watts) 25 W
Fault Protection Current Limiting, Over Temperature, Over Voltage
Control Features Frequency Control
Operating Temperature -40°C ~ 150°C (TJ)
Grade -
Qualification -
Mounting Type Through Hole
Package / Case 8-DIP (0.300", 7.62mm), 7 Leads
Supplier Device Package 8-PDIP-B