TNY274-280
®
TinySwitch-III Family
Energy Efficient, Off-Line Switcher with
Enhanced Flexibility and Extended Power Range
Product Highlights
+
+
DC
Lowest System Cost with Enhanced Flexibility
Output
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Simple ON/OFF control, no loop compensation needed
Selectable current limit through BP/M capacitor value
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Wide-Range
HV DC Input
D
S
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Higher current limit extends peak power or, in open
frame applications, maximum continuous power
Lower current limit improves efficiency in enclosed
adapters/chargers
Allows optimum TinySwitch-III choice by swapping
devices with no other circuit redesign
EN/UV
BP/M
TinySwitch-III
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PI-4095-082205
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Tight I2f parameter tolerance reduces system cost
Figure 1. Typical Standby Application.
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Maximizes MOSFET and magnetics power delivery
Minimizes max overload power, reducing cost of
transformer, primary clamp & secondary components
OUTPUT POWER TABLE
ON-time extension – extends low line regulation range/
hold-up time to reduce input bulk capacitance
Self-biased: no bias winding or bias components
Frequency jittering reduces EMI filter costs
Pin-out simplifies heatsinking to the PCB
230 VAC ±15%
85-265 VAC
Peak or
Peak or
PRODUCT3
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Adapter1 Open Adapter1 Open
Frame2
Frame2
8.5 W
11.5 W
15 W
TNY274 P or G 6 W
TNY275 P or G 8.5 W
TNY276 P or G 10 W
TNY277 P or G 13 W
TNY278 P or G 16 W
TNY279 P or G 18 W
TNY280 P or G 20 W
11 W
5 W
6 W
SOURCE pins are electrically quiet for low EMI
15 W
Enhanced Safety and Reliability Features
19 W
7 W
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Accurate hysteretic thermal shutdown protection with
automatic recovery eliminates need for manual reset
Improved auto-restart delivers <3% of maximum power
in short circuit and open loop fault conditions
Output overvoltage shutdown with optional Zener
Line under-voltage detect threshold set using a single
optional resistor
23.5 W
28 W
8 W
18 W
10 W
12 W
14 W
21.5 W
25 W
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32 W
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36.5 W
28.5 W
Table 1. Notes: 1. Minimum continuous power in a typical non-
ventilated enclosed adapter measured at 50 °C ambient. Use of an
external heatsink will increase power capability 2. Minimum peak
power capability in any design or minimum continuous power in an
open frame design (see KeyApplication Considerations). 3. Packages:
P: DIP-8C, G: SMD-8C. See Part Ordering Information.
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Very low component count enhances reliability and
enables single-sided printed circuit board layout
High bandwidth provides fast turn on with no overshoot
and excellent transient load response
Extended creepage between DRAIN and all other pins
improves field reliability
EcoSmart®– Extremely Energy Efficient
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PC Standby and other auxiliary supplies
DVD/PVR and other low power set top decoders
Supplies for appliances, industrial systems, metering, etc.
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Easily meets all global energy efficiency regulations
No-load <150 mW at 265 VAC without bias winding,
<50 mW with bias winding
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ON/OFF control provides constant efficiency down to
very light loads – ideal for mandatory CEC regulations
and 1 W PC standby requirements
Description
TinySwitch-IIIincorporatesa700VpowerMOSFET,oscillator,
high voltage switched current source, current limit (user
selectable) and thermal shutdown circuitry. The IC family uses
anON/OFFcontrolschemeandoffersadesignflexiblesolution
with a low system cost and extended power capability.
Applications
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Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio, shavers, etc.
February 2006
POWERINT [ Power Integrations ]
