TNY180 Datasheet PDF - Power Integrations

Part Number TNY180
Description (TNY174 - TNY180) Offline Switcher
Manufacturers Power Integrations 
Logo Power Integrations Logo 

Preview ( 22 pages )
TNY180 datasheet, circuit
TinySwitch®-LT Family
Energy Efcient, Ofine 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
www.DataShfreaemt4eUa.cpopmlications, maximum continuous power
- Lower current limit improves efciency in enclosed
- 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 lter costs
• Pin-out simplies heatsinking 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 eld reliability
EcoSmart®– Extremely Energy Efcient
• Easily meets all global energy efciency regulations
• No-load <150 mW at 265 VAC without bias winding,
<50 mW with bias winding
• ON/OFF control provides constant efciency down to
very light loads – ideal for mandatory CEC regulations
• 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.
Figure 1. Typical Application.
230 VAC ±15% 85-265 VAC
Peak or
Peak or
Adapter1 Open Adapter1 Open
TNY174PN 6 W 11 W 5 W 8.5 W
TNY175PN 8.5 W 15 W 6 W 11.5 W
TNY176PN 10 W 19 W 7 W 15 W
TNY177PN 13 W 23.5 W 8 W 18 W
TNY178PN 16 W 28 W 10 W 21.5 W
TNY179PN 18 W 32 W 12 W 25 W
TNY180PN 20 W 36.5 W 14 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 Key Application Considerations). 3. Packages:
P: DIP-8C, G: SMD-8C. See Part Ordering Information.
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 exible solution
with a low system cost and extended power capability.
August 2007

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1 page
TNY180 equivalent
for improved accuracy.
ON/OFF Operation with Current Limit State Machine
The internal clock of the TinySwitch-LT runs all the time. At the
beginning of each clock cycle, it samples the EN pin to decide
whether or not to implement a switch cycle, and based on the
sequence of samples over multiple cycles, it determines the
appropriate current limit. At high loads, the state machine sets
the current limit to its highest value. At lighter loads, the state
machine sets the current limit to reduced values.
Figure 6. Operation at Near Maximum Loading.
At near maximum load, TinySwitch-LT will conduct during
nearly all of its clock cycles (Figure 6). At slightly lower load,
it will “skip” additional cycles in order to maintain voltage
regulation at the power supply output (Figure 7). At medium
loads, cycles will be skipped and the current limit will be reduced
(Figure 8). At very light loads, the current limit will be reduced
even further (Figure 9). Only a small percentage of cycles will
occur to satisfy the power consumption of the power supply.
The response time of the ON/OFF control scheme is very fast
compared to PWM control. This provides tight regulation and
excellent transient response.
Power Up/Down
The TinySwitch-LT requires only a 0.1 μF capacitor on the
BYPASS/MULTI-FUNCTION pin to operate with standard
current limit. Because of its small size, the time to charge this
capacitor is kept to an absolute minimum, typically 0.6 ms. The
time to charge will vary in proportion to the BYPASS/MULTI-
FUNCTION pin capacitor value when selecting different current
limits. Due to the high bandwidth of the ON/OFF feedback,
there is no overshoot at the power supply output.
Figure 10 shows typical power up timing waveforms.
Under startup and overload conditions, when the conduction time
is less than 400 ns, the device reduces the switching frequency
to maintain control of the peak drain current.
During power down, the power MOSFET will switch for 64
ms after the output loses regulation.
Figure 7. Operation at Moderately Heavy Loading.
Figure 8. Operation at Medium Loading.

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Information Total 22 Pages
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