TNY174-180
®
TinySwitch-LT Family
Energy Efficient, Offline Switcher with
Enhanced Flexibility and Extended Power Range
Product Highlights
+
AC
Input
DC
Output
Lowest System Cost with Enhanced Flexibility
•
•
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650 V rating optimized for non-active PFC applications
Simple ON/OFF control, no loop compensation needed
Selectable current limit through BP/M capacitor value
-
D
S
EN
-
-
-
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-LT choice by swapping
devices with no other circuit redesign
BP/M
TinySwitch-LT
PI-4770-073107
Figure 1. Typical Application.
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•
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
OUTPUT POWER TABLE
230 VAC ±15%
85-265 VAC
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
Peak or
Peak or
PRODUCT3
Adapter1 Open Adapter1 Open
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•
•
•
Frame2
Frame2
8.5 W
11.5 W
15 W
TNY174PN
TNY175PN
TNY176PN
TNY177PN
TNY178PN
TNY179PN
TNY180PN
6 W
8.5 W
10 W
13 W
16 W
18 W
20 W
11 W
5 W
6 W
15 W
SOURCE pins are electrically quiet for low EMI
19 W
7 W
Enhanced Safety and Reliability Features
•
23.5 W
28 W
8 W
18 W
Accurate hysteretic thermal shutdown protection with
automatic recovery eliminates need for manual reset
Auto-restart delivers <3% of maximum power in short
circuit and open loop fault conditions
10 W
12 W
14 W
21.5 W
25 W
•
32 W
36.5 W
28.5 W
•
•
Output overvoltage shutdown with optional Zener
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
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.
•
•
Extended creepage between DRAIN and all other pins
improves field reliability
EcoSmart®– Extremely Energy Efficient
•
•
Easily meets all global energy efficiency regulations
No-load <150 mW at 265 VAC without bias winding,
<50 mW with bias winding
ON/OFF control provides constant efficiency down to
very light loads – ideal for mandatory CEC regulations
Description
TinySwitch-LTincorporatesa650VpowerMOSFET,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
•
Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio, shavers, etc.
•
•
DVD/PVR and other low power set top decoders
Supplies for appliances, industrial systems, metering, etc.
August 2007
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