®
TNY264/266-268
®
TinySwitch-II Family
Enhanced, Energy Efficient,
Low Power Off-line Switcher
Product Highlights
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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
Optional
DC Output
UV Resistor
-
Wide-Range
HV DC Input
D
EN/UV
• 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
BP
S
TinySwitch-II
-
PI-2684-101700
Figure 1. Typical Standby Application.
OUTPUT POWER TABLE
Better Cost/Performance over RCC & Linears
• Lower system cost than RCC, discrete PWM and other
integrated/hybrid solutions
• Cost effective replacement for bulky regulated linears
• Simple ON/OFF control–no loop compensation needed
• No bias winding–simpler, lower cost transformer
230 VAC 15%
Open
85-265 VAC
PRODUCT(3)
Open
Adapter(1)
Adapter(1)
Frame(2)
Frame(2)
9 W
TNY264P or G 5.5 W
TNY266P or G 10 W
TNY267P or G 13 W
4 W
6 W
6 W
9.5 W
12 W
15 W
15 W
19 W
23 W
EcoSmart®–Extremely Energy Efficient
8 W
TNY268P or G
• 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
16 W
10 W
Table 1. 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.
High Performance at Low Cost
• 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 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-voltagethreshold,whicheliminatespowerdownglitches
causedbytheslowdischargeofinputstoragecapacitorspresent
inapplicationssuchasstandbysupplies.Theoperatingfrequency
of132kHzisjitteredtosignificantlyreduceboththequasi-peak
and average EMI, minimizing filtering cost.
Description
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
powerMOSFET,oscillator,highvoltageswitchedcurrentsource,
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
July 2001