TNY274-280
®
TinySwitch-III Family
Energy-Efficient, Off-Line Switcher With
Enhanced Flexibility and Extended Power Range
Product Highlights
+
+
Lowest System Cost with Enhanced Flexibility
• Simple ON/OFF control, no loop compensation needed
• Selectable current limit through BP/M capacitor value
• Higher current limit extends peak power or, in open
frame applications, maximum continuous power
• Lower current limit improves efficiency in enclosed
adapters/chargers
DC
Output
-
Wide-Range
HV DC Input
D
S
EN/UV
BP/M
TinySwitch-III
• Allows optimum TinySwitch-III choice by swapping
devices with no other circuit redesign
-
PI-4095-082205
• Tight I2f parameter tolerance reduces system cost
• Maximizes MOSFET and magnetics power delivery
• Minimizes max overload power, reducing cost of
transformer, primary clamp & secondary components
• ON-time extension – extends low line regulation range/hold-up
time to reduce input bulk capacitance
Figure 1. Typical Standby Application.
Output Power Table
230 VAC ꢀ15
81-261 VAC
• Self-biased: no bias winding or bias components
• Frequency jittering reduces EMI filter costs
• Pin-out simplifies heatsinking to the PCB
Product3
Peak or
Peak or
Open
Adapter1
Open
Adapter1
Frame2
Frame2
• SOURCE pins are electrically quiet for low EMI
TNY274P/G
TNY275P/G
TNY276P/G
TNY277P/G
TNY278P/G
TNY279P/G
TNY280P/G
6 W
8.1 W
ꢀ0 W
ꢀ3 W
ꢀ6 W
ꢀ8 W
20 W
ꢀꢀ W
ꢀ1 W
1 W
6 W
8.1 W
ꢀꢀ.1 W
ꢀ1 W
Enhanced Safety and Reliability Features
• Accurate hysteretic thermal shutdown protection with
automatic recovery eliminates need for manual reset
• Improved auto-restart delivers <35 of maximum power in short
circuit and open loop fault conditions
• Output overvoltage shutdown with optional Zener
• Line undervoltage detect threshold set using a single optional
resistor
• 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
ꢀ9 W
7 W
23.1 W
28 W
8 W
ꢀ8 W
ꢀ0 W
ꢀ2 W
ꢀ4 W
2ꢀ.1 W
21 W
32 W
36.1 W
28.1 W
Table 1. Output Power Table.
Notes:
ꢀ. Minimum continuous power in a typical non-ventilated enclosed adapter
measured at +10 °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 Key Applications Considerations).
3. Packages: P: DIP-8C, G: SMD-8C. See Part Ordering Information.
• Extended creepage between DRAIN and all other pins improves
field reliability
EcoSmart®– Extremely Energy Efficient
• Easily meets all global energy efficiency regulations
• No-load <ꢀ10 mW at 261 VAC without bias winding, <10 mW
with bias winding
• ON/OFF control provides constant efficiency down to very light
loads – ideal for mandatory CEC regulations and ꢀ W PC
standby requirements
Description
TinySwitch-III incorporates a 700 V power MOSFET, oscillator,
high voltage switched current source, current limit (user
selectable) and thermal shutdown circuitry. The IC family uses an
ON/OFF control scheme and offers a design flexible solution with
a low system cost and extended power capability.
Applications
• Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio, shavers, etc.
• PC Standby and other auxiliary supplies
• DVD/PVR and other low power set top decoders
• Supplies for appliances, industrial systems, metering, etc.
www.powerint.com
January 2009
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