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부품번호 TNY280P 기능
기능 (TNY274 - TNY280) Energy Efficient / Off-Line Switcher
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TNY280P 데이터시트, 핀배열, 회로
www.DataSheet4U.com
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
- Allows optimum TinySwitch-III choice by swapping
devices with no other circuit redesign
Wide-Range
HV DC Input
D
TinySwitch-III
S
-
EN/UV
BP/M
DC
Output
-
PI-4095-082205
• Tight I2f parameter tolerance reduces system cost
Figure 1. Typical Standby Application.
- Maximizes MOSFET and magnetics power delivery
- Minimizes max overload power, reducing cost of
transformer, primary clamp & secondary components
OUTPUT POWER TABLE
• ON-time extension – extends low line regulation range/
230 VAC ±15%
85-265 VAC
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
PRODUCT3
DataSheet4U.com
Peak or
Peak or
Adapter1 Open Adapter1 Open
Frame2
Frame2
DataShee
• SOURCE pins are electrically quiet for low EMI
TNY274 P or G 6 W 11 W 5 W 8.5 W
TNY275 P or G 8.5 W 15 W 6 W 11.5 W
Enhanced Safety and Reliability Features
• Accurate hysteretic thermal shutdown protection with
automatic recovery eliminates need for manual reset
TNY276 P or G 10 W 19 W
TNY277 P or G 13 W 23.5 W
7W
8W
15 W
18 W
• Improved auto-restart delivers <3% of maximum power
TNY278 P or G 16 W 28 W 10 W 21.5 W
in short circuit and open loop fault conditions
TNY279 P or G 18 W 32 W 12 W 25 W
• Output overvoltage shutdown with optional Zener
• Line under-voltage detect threshold set using a single
TNY280 P or G 20 W 36.5 W 14 W 28.5 W
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
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.
• 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
and 1 W PC standby requirements
Applications
• Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio, shavers, etc.
DataSheet4U.com
• PC Standby and other auxiliary supplies
• DVD/PVR and other low power set top decoders
• Supplies for appliances, industrial systems, metering, etc.
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.
February 2006
DataSheet4 U .com
DataSheet4U.com




TNY280P pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
TNY274-280
In addition, there is a 6.4 V shunt regulator clamping the
Auto-Restart
BYPASS/MULTI-FUNCTION pin at 6.4 V when current
In the event of a fault condition such as output overload, output
is provided to the BYPASS/MULTI-FUNCTION pin
short circuit, or an open loop condition, TinySwitch-III enters
through an external resistor. This facilitates powering of
into auto-restart operation. An internal counter clocked by the
TinySwitch-III externally through a bias winding to decrease
oscillator is reset every time the EN/UV pin is pulled low. If the
the no-load consumption to well below 50 mW.
EN/UV pin is not pulled low for 64 ms, the power MOSFET
switching is normally disabled for 2.5 seconds (except in the
BYPASS/MULTI-FUNCTION Pin Under-Voltage
case of line under-voltage condition, in which case it is disabled
The BYPASS/MULTI-FUNCTION pin under-voltage circuitry
until the condition is removed). The auto-restart alternately
disables the power MOSFET when the BYPASS/MULTI-
enables and disables the switching of the power MOSFET until
FUNCTION pin voltage drops below 4.9 V in steady state
the fault condition is removed. Figure 5 illustrates auto-restart
operation. Once the BYPASS/MULTI-FUNCTION pin voltage
circuit operation in the presence of an output short circuit.
drops below 4.9 V in steady state operation, it must rise back
to 5.85 V to enable (turn-on) the power MOSFET.
In the event of a line under-voltage condition, the switching of
the power MOSFET is disabled beyond its normal 2.5 seconds
Over Temperature Protection
until the line under-voltage condition ends.
The thermal shutdown circuitry senses the die temperature. The
threshold is typically set at 142 °C with 75 °C hysteresis. When
Adaptive Switching Cycle On-Time Extension
thedietemperaturerisesabovethisthresholdthepowerMOSFET
Adaptive switching cycle on-time extension keeps the cycle
is disabled and remains disabled until the die temperature falls
on until current limit is reached, instead of prematurely
by 75 °C, at which point it is re-enabled. A large hysteresis of
75 °C (typical) is provided to prevent overheating of the PC
terminating
reduces the
amftienrimthuemDiCnMpAuXt
signal goes low.
voltage required
This feature
to maintain
board due to a continuous fault condition.
regulation, extending hold-up time and minimizing the size
of bulk capacitor required. The on-time extension is disabled
Current Limit
during the startup of the power supply, until the power supply
et4U.com The current limit circuit senses the current in the power MOSFET.
output reaches regulation.
When
power
this current exceeds the
MOSFETis turned off for
tihneterrenmaal itnhdreersohfotlhda(tIcLyIMcDIlTea).,tTathhSeeheet4LUi.nceomUnder-Voltage
Sense
Circuit
DataShee
current limit state machine reduces the current limit threshold
The DC line voltage can be monitored by connecting an external
by discrete amounts under medium and light loads.
resistor from the DC line to the EN/UV pin. During power-up or
when the switching of the power MOSFET is disabled in auto-
The leading edge blanking circuit inhibits the current limit
restart, the current into the EN/UV pin must exceed 25 µA to
comparator for
turned on. This
laeashdoinrgt teimdgee(btLlEaBn)kainftgertitmhee
power MOSFET is
has been set so that
initiate switching of the power MOSFET. During power-up, this
is accomplished by holding the BYPASS/MULTI-FUNCTION
current spikes caused by capacitance and secondary-side rectifier
pin to 4.9 V while the line under-voltage condition exists. The
reverse recovery time will not cause premature termination of
BYPASS/MULTI-FUNCTION pin then rises from 4.9 V to
the switching pulse.
5.85 V when the line under-voltage condition goes away. When the
switching of the power MOSFETis disabled in auto-restart mode
and a line under-voltage condition exists, the auto-restart counter
300
V
DRAIN
is stopped. This stretches the disable time beyond its normal
2.5 seconds until the line under-voltage condition ends.
200
100
The line under-voltage circuit also detects when there is
no external resistor connected to the EN/UV pin (less than
0
~1 µA into the pin). In this case the line under-voltage function
is disabled.
10
V
5 DC-OUTPUT
TinySwitch-III Operation
0
0 2500
Time (ms)
Figure 5. Auto-Restart Operation.
DataSheet4U.com
TinySwitch-III devices operate in the current limit mode. When
enabled, the oscillator turns the power MOSFET on at the
beginning of each cycle. The MOSFET is turned off when the
5000 rceuarcrehnetdr.aSminpcseutphteohtihgehceustrrceunrtrleinmtiltimoriwt lheevnelthanedDfCreMqAuXelnimcyitoisf
a TinySwitch-III design are constant, the power delivered to the
4E
2/06
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TNY280P 전자부품, 판매, 대치품
www.DataSheet4U.com
TNY274-280
Power Up/Down
The TinySwitch-III 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. When an
external resistor (4 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 in applications with and without an external
resistor (4 M) connected to the EN/UV pin.
Functional Description above). This has two main benefits.
First, for a nominal application, this eliminates the cost of a
bias winding and associated components. Secondly, for battery
charger applications, the current-voltage characteristic often
allows the output voltage to fall close to zero volts while still
delivering power. TinySwitch-III accomplishes this without a
forward bias winding and its many associated components. For
applications that require very low no-load power consumption
(50 mW), a resistor from a bias winding to the BYPASS/
MULTI-FUNCTION pin can provide the power to the chip.
The minimum recommended current supplied is 1 mA. The
BYPASS/MULTI-FUNCTION pin in this case will be clamped
at 6.4 V. This method will eliminate the power draw from the
DRAIN pin, thereby reducing the no-load power consumption
and improving full-load efficiency.
Under startup and overload conditions, when the conduction time
Current Limit Operation
is less than 400 ns, the device reduces the switching frequency Each switching cycle is terminated when the DRAIN current
to maintain control of the peak drain current.
reaches the current limit of the device. Current limit operation
provides good line ripple rejection and relatively constant power
During power-down, when an external resistor is used, the
delivery independent of input voltage.
power MOSFET will switch for 64 ms after the output loses
regulation. The power MOSFET will then remain off without
BYPASS/MULTI-FUNCTION Pin Capacitor
any glitches since the under-voltage function prohibits restart
The BYPASS/MULTI-FUNCTION pin can use a ceramic
when the line voltage is low.
capacitor as small as 0.1 µF for decoupling the internal power
et4U.com
Figure 12 illustrates a typical power-down timing waveform.
supply of the device.Alarger capacitor size can be used to adjust
the current limit. For TNY275-280, a 1 µF BP/M pin capacitor
DataShee
Figure 13 illustrates a very slow power-down timing wavDeafotarmSheet4wUi.lclosmelect a lower current limit equal to the standard current
as in standby applications. The external resistor (4 M) is
limit of the next smaller device and a 10 µF BP/M pin capacitor
connected to the EN/UV pin in this case to prevent unwanted
will select a higher current limit equal to the standard current
restarts.
limit of the next larger device. The higher current limit level of
the TNY280 is set to 850 mA typical. The TNY274 MOSFET
No bias winding is needed to provide power to the chip
does not have the capability for increased current limit so this
because it draws the power directly from the DRAIN pin (see
feature is not available in this device.
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7E
2/06

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