TNY266G

TinySwitch?-II integrates a 700 V power MOSFET, oscillator,
high voltage switched current source, current limit and thermal
shutdown circuitry onto a monolithic device. 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 TinySwitch-II devices incorporate
auto-restart, line undervoltage 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.
PI-2684-061815
Wide-Range
High-Voltage
DC Input D
S
EN/UV
BP

–

–
DC
Output
TinySwitch-II
Optional
UV Resistor
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.