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> 10 enhanced energy efficient off-line switcher TNY267 p
10 enhanced energy efficient off-line switcher TNY267 p
Enhanced Energy Efficient Low Power Off-line Switcher TNY267P TinySwitch-II Family
TinySwitch-II Family Enhanced Energy Efficient Low Power Off-line Switcher TNY267P
Notes: 1.Typical continuous power in a non-ventilated enclosed
adapter measured at 50 C ambient. 2. Maximum practical continuous
power in an open frame design with adequate heat sinking, measured at
50 C ambient (See key applications section for details). 3. Packages:
P: DIP-8B, G: SMD-8B. Please see part ordering information
TinySwitch-II Features Reduce System Cost
.Fully integrated auto-restart for short circuit and open
loop fault protection saves external component costs
.Built-in circuitry practically eliminates audible noise with
ordinary varnished transformer
.Programmable line under-voltage detect feature prevents
power on/off glitches saves external components
.Frequency jittering dramatically reduces EMI (~10 dB)
minimizes EMI filter component costs
.132 kHz operation reduces transformer size allows use of
EF12.6 or EE13 cores for low cost and small size
.Very tight tolerances and negligible temperature variation
on key parameters eases design and lowers cost
.Lowest component count switcher solution
Better Cost/Performance over RCC & Linears
.Lower system cost than RCC, discrete PWM and other
.Cost effective replacement for bulky regulated linears
.Simple ON/OFF control no loop compensation needed
.No bias winding simpler, lower cost transformer
EcoSmart? Extremely Energy Efficient
.No load consumption < 50 mW with bias winding and
< 250 mW without bias winding at 265 VAC input
.Meets Blue Angel, Energy Star, and EC requirements
.Ideal for cell-phone charger and PC standby applications
.High voltage powered ideal for charger applications
.High bandwidth provides fast turn on with no overshoot
.Current limit operation rejects line frequency ripple
.Built-in current limit and thermal protection
TinySwitch-II maintains the simplicity of the TinySwitch
topology, while providing a number of new enhancements to
further reduce system cost and component count, and to
practically eliminate audible noise. Like TinySwitch, a 700 V
power MOSFET, oscillator, high voltage switched current source,
current limit and thermal shutdown circuitry are integrated 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. The fully
integrated auto-restart circuit safely limits output power during
fault conditions such as output short circuit or open loop,
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.
http://datasheet.digchip.com/373/373-00220-0-TNY264-266-268.pdf
