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Product attributes Property Value
Manufacturer Power Integrations
Product Series TOPSwitch®-JX
Packaging Cut Tape (CT) | Tape & Reel (TR)
Output Isolation Isolated
Internal Switch(s) Yes
Voltage - Breakdown 725V
Topology Flyback
Voltage - Start Up -
Voltage - Supply (Vcc/Vdd) -
Duty Cycle 78%
Frequency - Switching 66kHz, 132kHz
Power (Watts) 53 W
Fault Protection Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit
Control Features Frequency Control
Operating Temperature -40°C ~ 150°C (TJ)
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case 12-BESOP (0.350", 8.89mm Width), 11 Leads, Exposed Pad
Supplier Device Package 12-ESOP
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The Power Integrations TOP265KG-TL is a flyback offline switcher in the TOPSwitch-JX series, delivering up to 53 W with a 725V breakdown rating and an integrated switch. Housed in a 12-BESOP package with exposed pad, it provides galvanically isolated output, 78% max duty cycle, and 66kHz/132kHz frequency control with full fault protection.

  • Integrated switch reduces external component count and simplifies isolated flyback design.
  • 725V breakdown voltage supports robust offline operation.
  • 53 W output power suits medium-power isolated supplies.
  • Comprehensive fault protection (current limiting, over load, over temperature, over voltage, short circuit) improves reliability.
  • Wide -40°C to 150°C junction temperature range for demanding environments.

AC-DC Adapters and Chargers

The TOP265KG-TL flyback topology with integrated switch and 725V breakdown suits compact isolated AC-DC adapters up to 53 W, simplifying design by eliminating an external power MOSFET.

Industrial Auxiliary Supplies

With a -40°C to 150°C junction temperature range and 78% max duty cycle, this TOPSwitch-JX device supports reliable isolated bias supplies in industrial equipment.

Consumer Electronics Power

Frequency control at 66kHz/132kHz helps manage switching behavior in isolated flyback designs for set-top boxes and home appliances.

Standby and Housekeeping Rails

Comprehensive fault protection including over voltage, over load, and short circuit makes this device suitable for isolated housekeeping power in larger systems.

Q: What is the topology of the TOP265KG-TL?
A: It is a flyback offline switcher with galvanically isolated output and an integrated switch.
Q: What is the breakdown voltage?
A: The Vds breakdown rating is 725V.
Q: How much power can it deliver?
A: It delivers up to 53 W.
Q: What switching frequency does it use?
A: It operates at 66kHz or 132kHz with frequency control.
Q: What protections are included?
A: Current limiting, over load, over temperature, over voltage, and short circuit protection.
Base Product Number : TOP265KG
12-BESOP 53 W 725V AC-DC Converter Flyback Converter Integrated Switch Isolated Offline Switcher TOPSwitch-JX
Q: What is the topology of the TOP265KG-TL?
A: It is a flyback offline switcher with galvanically isolated output and an integrated switch.
Q: What is the breakdown voltage?
A: The Vds breakdown rating is 725V.
Q: How much power can it deliver?
A: It delivers up to 53 W.
Q: What switching frequency does it use?
A: It operates at 66kHz or 132kHz with frequency control.
Q: What protections are included?
A: Current limiting, over load, over temperature, over voltage, and short circuit protection.