TNY268PN

Product Summary

The TNY268PN is an enhanced, energy efficient, low power off-line switcher. 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 Table 1. Notes: 1.Minimum continuous power in a typical non-ventilated enclosed adapter measured at 50°C ambient. 2. Minimum practical continuous power in an open frame design with adequate heat sinking, measured at 50°C ambient (See Key Applications Considerations). 3. Packages: P: DIP-8B, For lead-free package options, see Part Ordering Information.; TinySwitch-II TNY268PN devices incorporate 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 ; under-voltage 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.

Parametrics

TNY268PN absolute maximum ratings: (1)DRAIN Voltage: -0.3V to 700 V; (2)DRAIN Peak Current: 880mA; (3)EN/UV Voltage: 0.3V to 9V; (4)EN/UV Current: 100mA; (5)BYPASS Voltage: -0.3V to 9V; (6)Storage Temperature: 65°C to 150°C; (7)Operating Junction Temperature: -40°C to 150°C; (8)Lead Temperature: 260°C.

Features

TNY268PN features: (1)Fully integrated auto-restart for short circuit and open loop fault protection – saves external component costs; (2)Built-in circuitry practically eliminates audible noise with ordinary dip-varnished transformer; (3)Programmable line under-voltage detect feature prevents power on/off glitches – saves external components; (4)Frequency jittering dramatically reduces EMI (~10 dB)–minimizes EMI filter component costs; (5)132 kHz operation reduces transformer size – allows use of EF12.6 or EE13 cores for low cost and small size; (6)Very tight tolerances and negligible temperature variation on key parameters eases design and lowers cost; (7)Lowest component count switcher solution; (8)Expanded scalable device family for low system cost.

Diagrams