TNY268 Power Integrations Off-line Switcher IC

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Description

The TNY268 integrates a 700 V power MOSFET, oscillator, high voltage switched current source, current limit, and thermal shutdown circuitry onto a monolithic device IC. The start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias winding and associated circuitry. In addition, the TNY268 device incorporates auto-restart, line under-voltage sense, and frequency jittering. An innovative design minimizes audio frequency components in the simple ON/OFF control scheme to practically eliminate audible noise with standard taped/varnished transformer construction.
The fully integrated auto-restart circuit safely limits output power during fault conditions such as output short circuit or open loop, reducing component count and secondary feedback circuitry cost. An optional line sense resistor externally programs a line undervoltage threshold, which eliminates power down glitches caused by the slow discharge of input storage capacitors present in applications such as standby supplies. The operating frequency of 132 kHz is jittered to significantly reduce both the quasi-peak and average EMI, minimizing filtering cost.

Pinout 

1 BYPASS (BP)
2 SOURCE (S)
3 SOURCE (S)
4 ENABLE UNDERVOLTAGE (EN/UN)
5 DRAIN (D)
7 SOURCE (HV RTN)
8 SOURCE (HV RTN)

Features

  • Built-in circuitry practically eliminates audible noise with ordinary dip-varnished transformer
  • Programmable line undervoltage detect feature prevents power on/off glitches
  • Very tight tolerances and negligible temperature variation on key parameters eases design and lowers cost
  • 132 kHz frequency reduces transformer/power supply size
  • Hysteretic thermal shutdown for automatic fault recovery
  • Large thermal hysteresis prevents PC board overheating 
For more information refer to Datasheet
Specifications
Model  TNY268

230 VAC ± 15%

Adapter

Open Frame

 

16W

23W

85-265 VAC

Adapter

Open Frame

 

10W

15W

Drain Voltage  -0.3V to 700V
Drain Peak Current 880mA
EN/UV Voltage  -0.3V to 9V
EN/UV Current  100 mA
BYPASS Voltage -0.3V to 9V
Storage Temperature  -65 °C to 150 °C
Operating Junction Temperature -40 °C to 150 °C
Switching Frequency 

132 kHz

Country of Origin China

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