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TNY174-180 TinySwitch-LT Family
Energy Efficient, Offline Switcher with Enhanced Flexibility and Extended Power Range
Product Highlights
Lowest System Cost with Enhanced Flexibility • 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
• 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
• 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
• Self-biased: no bias winding or bias components • Frequency jittering reduces EMI filter costs • Pin-out simplifies heat sinking to the PCB • SOURCE pins are electrically quiet for low EMI
Enhanced Safety and Reliability Features • 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 • 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 • 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
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.
Description
TinySwitch™-LT incorporates a 650 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.
AC Input
D EN TinySwitch-LT BP/M
S
Figure 1. Typical Application.
+
DC Output
PI-4770-010709
Output Power Table
Product3
TNY174P/D4 TNY175P/D4 TNY176P/D4 TNY177P4 TNY177D TNY178P TNY178D TNY179P TNY180P
230 VAC ± 15%
Adapter1
Peak or Open Frame2
6W
11 W
8.5 W
15 W
10 W
19 W
13 W
23.5 W
11.5 W
23.5 W
16 W
28 W
14.5 W
26 W
18 W
32 W
20 W
36.5 W
85-265 VAC
Adapter1
Peak or Open Frame2
5W
8.5 W
6W
11.5 W
7W
15 W
8W
18 W
7W
18 W
10 W
21.5 W
9W
19.5 W
12 W
25 W
14 W
28..