®
TNY256
TinySwitch® Plus
Energy Efficient, Low Power Off-line Switcher
Product Highlights
+
+
TinySwitch Plus Features
• Extended power range
• Fully integrated auto-restart reduces short circuit current
Optional
UV Resistor
DC Output
–
• Line under-voltage sense eliminates turn-off glitches
• Frequency jittering dramatically reduces EMI (5 to 10 dB)
• TO-220 package option
Wide-Range
HV DC Input
D
EN/UV
BP
TinySwitch Plus
S
Lowest Cost, Low Power Switcher Solution
• Lower cost than RCC, discrete PWM and other
integrated/hybrid solutions
–
PI-2363-022699
• Cost effective replacement for bulky linear adapters
• Lowest component count
Figure 1. Typical Standby Application.
• Simple ON/OFF control – no loop compensation components
• No bias winding – simpler, lower cost transformer
• Designed to work with low cost external components
OUTPUT POWER CAPABILITY*
ORDER
PART
230 VAC or
115 VAC
w/Doubler
85-265
VAC
PACKAGE
NUMBER
Extremely Energy Efficient
TNY256P
TNY256G
TNY256Y
DIP-8
• Consumes only 30/60 mW at 115/230 VAC with no load
• Meets Blue Angel, Energy Star, Energy 2000 and
200mW European cell phone requirements for standby
• Saves $1 to $4 per year in energy costs (at $0.12/kWHr)
compared to bulky linear adapters
8-15 W
8-19 W
5-10 W
5-11 W
SMD-8
TO-220-7B
Table 1. * The low end of the power ranges shown represent enclosed
adapters with minimal heat sinking whereas, the high end of the power
ranges represent open frame power supplies with adequate heat
sinking, both measured at an ambient of 50 oC. Please refer to the Key
Application Considerations section for more details.
• Ideal for cellular phone chargers and adapters
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
TheTinySwitch Plusincorporatesauto-restart, lineunder-voltage
sense, and frequency jittering features. The auto-restart circuit
safely limits output power during fault conditions such as output
short or open loop. The auto-restart circuit is fully integrated and
does not require external timing components. The line under-
voltagesensethresholdcanbeexternallyprogrammedusingaline
senseresistor. Duringstart-up, thisfeaturekeepstheTNY256off
until the input line voltage reaches the under-voltage threshold.
When the input line voltage is removed, the line under-voltage
circuit prevents auto-restart attempts after the output goes out of
regulation. This eliminates power down glitches caused by the
slow discharge of input storage capacitors present in applications
such as standby supplies. A single resistor is used to implement
thisfeature,eliminatingwhatnormallytakesfivetosixcomponents.
Thelinesenseresistorisoptional.TheTNY256operatingfrequency
of130kHzisjittered(frequencymodulated)toreducebothquasi-
peak and average EMI, minimizing filtering costs.
Description
The TNY256 extends the power range of the TinySwitch family
of energy efficient, low power off-line switchers. TinySwitch
devices use a breakthrough design to provide the lowest cost,
high efficiency, off-line switching solution for low power
applications. Theyintegratea700VpowerMOSFET,oscillator,
high voltage switched current source, current limit and thermal
shutdown circuitry into a single, monolithic device. The
devices start-up and operate on power derived from the DRAIN
voltage,eliminatingtheneedforatransformerbiaswindingand
associated circuitry. TinySwitch's low operating current allows
power supply no-load consumption to be kept under 100 mW,
even at 265 VAC input.
July 2001
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