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What is TNY264G?

This electronic component, produced by the manufacturer "Power Integrations Inc.", performs the same function as "Enhanced/ Energy Efficient/ Low Power Off-line Switcher".


TNY264G Datasheet PDF - Power Integrations Inc.

Part Number TNY264G
Description Enhanced/ Energy Efficient/ Low Power Off-line Switcher
Manufacturers Power Integrations Inc. 
Logo Power Integrations  Inc. Logo 


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TNY264/266-268
TinySwitch-®II Family
Enhanced, Energy Efficient,
Low Power Off-line Switcher
®
Product Highlights
TinySwitch-II Features Reduce System Cost
Fully integrated auto-restart for short circuit and open
loop fault protectionsaves external component costs
Built-in circuitry practically eliminates audible noise with
ordinary varnished transformer
Programmable line under-voltage detect feature prevents
power on/off glitchessaves external components
Frequency jittering dramatically reduces EMI (~10 dB)
minimizes EMI filter component costs
132 kHz operation reduces transformer sizeallows use of
EF12.6 or EE13 cores for low cost and small size
Very tight tolerances and negligible temperature variation
on key parameters eases design and lowers cost
Lowest component count switcher solution
Better Cost/Performance over RCC & Linears
Lower system cost than RCC, discrete PWM and other
integrated/hybrid solutions
Cost effective replacement for bulky regulated linears
Simple ON/OFF controlno loop compensation needed
No bias windingsimpler, lower cost transformer
EcoSmart®–Extremely Energy Efficient
No load consumption < 50 mW with bias winding and
< 250 mW without bias winding at 265 VAC input
Meets Blue Angel, Energy Star, and EC requirements
Ideal for cell-phone charger and PC standby applications
High Performance at Low Cost
High voltage poweredideal for charger applications
High bandwidth provides fast turn on with no overshoot
Current limit operation rejects line frequency ripple
Built-in current limit and thermal protection
Description
TinySwitch-II maintains the simplicity of the TinySwitch
topology, while providing a number of new enhancements to
further reduce system cost and component count, and to
practically eliminate audible noise. Like TinySwitch, a 700 V
power MOSFET, oscillator, high voltage switched current source,
current limit and thermal shutdown circuitry are integrated onto a
monolithic device. The start-up and operating power are derived
directly from the voltage on the DRAIN pin, eliminating the
need for a bias winding and associated circuitry. In addition, the
+
Optional
UV Resistor
Wide-Range
HV DC Input
D
EN/UV
TinySwitch-II
BP
S
-
Figure 1. Typical Standby Application.
+
DC Output
-
PI-2684-101700
OUTPUT POWER TABLE
PRODUCT(3)
230 VAC ±15%
85-265 VAC
Adapter(1)
Open
Frame(2)
Adapter(1)
Open
Frame(2)
TNY264P or G 5.5 W 9 W 4 W 6 W
TNY266P or G 10 W 15 W 6 W 9.5 W
TNY267P or G 13 W 19 W 8 W 12 W
TNY268P or G 16 W 23 W 10 W 15 W
Table 1. Notes: 1. Typical continuous power in a non-ventilated enclosed
adapter measured at 50 ˚C ambient. 2. Maximum practical continuous
power in an open frame design with adequate heat sinking, measured at
50 ˚C ambient (See key applications section for details). 3. Packages:
P: DIP-8B, G: SMD-8B. Please see part ordering information.
TinySwitch-II devices incorporate auto-restart, line under-
voltage sense, and frequency jittering. An innovative design
minimizes audio frequency components in the simple ON/OFF
control scheme to practically eliminate audible noise with
standard taped/varnished transformer construction. The fully
integrated auto-restart circuit safely limits output power during
fault conditions such as output short circuit or open loop,
reducing component count and secondary feedback circuitry
cost. An optional line sense resistor externally programs a line
under-voltage threshold, which eliminates power down glitches
caused by the slow discharge of input storage capacitors present
in applications such as standby supplies. The operating frequency
of 132 kHz is jittered to significantly reduce both the quasi-peak
and average EMI, minimizing filtering cost.
July 2001

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TNY264G equivalent
the SOURCE pin. The optocoupler LED is connected in series
with a Zener diode across the DC output voltage to be regulated.
When the output voltage exceeds the target regulation voltage
level (optocoupler LED voltage drop plus Zener voltage), the
optocoupler LED will start to conduct, pulling the EN/UV pin
low. The Zener diode can be replaced by a TL431 reference
circuit for improved accuracy.
ON/OFF Operation with Current Limit State Machine
The internal clock of the TinySwitch-II runs all the time. At the
VEN
CLOCK
DMAX
IDRAIN
VDRAIN
PI-2749-050301
Figure 6. TinySwitch-II Operation at Near Maximum Loading.
TNY264/266-268
beginning of each clock cycle, it samples the EN/UV 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, when the EN/UV
pin is high (less than 240 µA out of the pin), a switching cycle
with the full current limit occurs. At lighter loads, when EN/UV
is high, a switching cycle with a reduced current limit occurs.
At near maximum load, TinySwitch-II will conduct during
nearly all of its clock cycles (Figure 6). At slightly lower load,
it will skipadditional 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 (Figure8). 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 TinySwitch-II ON/OFF control scheme
is very fast compared to normal PWM control. This provides
tight regulation and excellent transient response.
Power Up/Down
The TinySwitch-II requires only a 0.1 µF capacitor on the
BYPASS pin. Because of its small size, the time to charge this
capacitor is kept to an absolute minimum, typically 0.6 ms. Due
to the fast nature of the ON/OFF feedback, there is no overshoot
at the power supply output. When an external resistor (2 M) is
connected from the positive DC input to the EN/UV pin, the power
MOSFET switching will be delayed during power-up
until the DC line voltage exceeds the threshold (100 V). Figures
10 and 11 show the power-up timing waveform of TinySwitch-II
VEN
CLOCK
DMAX
VEN
CLOCK
DMAX
IDRAIN
IDRAIN
VDRAIN
VDRAIN
PI-2667-090700
Figure 7. TinySwitch-II Operation at Moderately Heavy Loading.
PI-2377-091100
Figure 8. TinySwitch-II Operation at Medium Loading.
5B
7/01


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