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부품번호 TNY267G 기능
기능 Enhanced/ Energy Efficient/ Low Power Off-line Switcher
제조업체 Power Integrations Inc.
로고 Power Integrations  Inc. 로고


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TNY267G 데이터시트, 핀배열, 회로
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




TNY267G pdf, 반도체, 판매, 대치품
TNY264/266-268
Over Temperature Protection
The thermal shutdown circuitry senses the die temperature. The
threshold is typically set at 135 °C with 70 °C hysteresis. When
the die temperature rises above this threshold the power
MOSFET is disabled and remains disabled until the die
temperature falls by 70 °C, at which point it is re-enabled. A
large hysteresis of 70 °C (typical) is provided to prevent
overheating of the PC board due to a continuous fault condition.
Current Limit
The current limit circuit senses the current in the power MOSFET.
When this current exceeds the internal threshold (ILIMIT), the
power MOSFET is turned off for the remainder of that cycle.
The current limit state machine reduces the current limit threshold
by discrete amounts under medium and light loads.
The leading edge blanking circuit inhibits the current limit
comparator for a short time (t ) after the power MOSFET is
LEB
turned on. This leading edge blanking time has been set so that
current spikes caused by capacitance and secondary-side rectifier
reverse recovery time will not cause premature termination of
the switching pulse.
Auto-Restart
In the event of a fault condition such as output overload, output
short circuit, or an open loop condition, TinySwitch-II enters
into auto-restart operation. An internal counter clocked by the
oscillator gets reset every time the EN/UV pin is pulled low. If
the EN/UV pin is not pulled low for 50 ms, the power MOSFET
switching is normally disabled for 850 ms (except in the case of
line under-voltage condition in which case it is disabled until
the condition is removed). The auto-restart alternately enables
and disables the switching of the power MOSFET until the fault
condition is removed. Figure 5 illustrates auto-restart circuit
operation in the presence of an output short circuit.
In the event of a line under-voltage condition, the switching of
300
V
DRAIN
200
100
0
10
V
5 DC-OUTPUT
0
0 1000
Time (ms)
Figure 5. TinySwitch-II Auto-Restart Operation.
4B
7/01
2000
the power MOSFET is disabled beyond its normal 850 ms time
until the line under-voltage condition ends.
Line Under-Voltage Sense Circuit
The DC line voltage can be monitored by connecting an
external 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-restart, the current into the EN/UV pin must
exceed 50 µA to initiate switching of the power MOSFET.
During power-up, this is implemented by holding the BYPASS
pin to 4.8 V while the line under-voltage condition exists. The
BYPASS pin then rises from 4.8 V to 5.8V when the line under-
voltage condition goes away. When the switching of the power
MOSFET is disabled in auto-restart mode and a line under-
voltage condition exists, the auto-restart counter is stopped.
This stretches the disable time beyond its normal 850ms until
the line under-voltage condition ends.
The line under-voltage circuit also detects when there is no
external resistor connected to the EN/UV pin (less than ~ 2 µA
into pin). In this case the line under-voltage function is disabled.
TinySwitch-II Operation
TinySwitch-II 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
current ramps up to the current limit or when the DC limit is
MAX
reached. As the highest current limit level and frequency of a
TinySwitch-II design are constant, the power delivered to the
load is proportional to the primary inductance of the transformer
and peak primary current squared. Hence, designing the supply
involves calculating the primary inductance of the transformer
for the maximum output power required. If the TinySwitch-II is
appropriately chosen for the power level, the current in the
calculated inductance will ramp up to current limit before the
DCMAX limit is reached.
Enable Function
TinySwitch-II senses the EN/UV pin to determine whether or
not to proceed with the next switch cycle as described earlier.
The sequence of cycles is used to determine the current limit.
Once a cycle is started, it always completes the cycle (even
when the EN/UV pin changes state half way through the cycle).
This operation results in a power supply in which the output
voltage ripple is determined by the output capacitor, amount of
energy per switch cycle and the delay of the feedback.
The EN/UV pin signal is generated on the secondary by
comparing the power supply output voltage with a reference
voltage. The EN/UV pin signal is high when the power supply
output voltage is less than the reference voltage.
In a typical implementation, the EN/UV pin is driven by an
optocoupler. The collector of the optocoupler transistor
isconnected to the EN/UV pin and the emitter is connected to

4페이지










TNY267G 전자부품, 판매, 대치품
TNY264/266-268
C8 680 pF
Y1 Safety
Shield
T1
D5
1N5819
18
D1
1N4005 D2
1N4005
R2
200 k
C3
2.2 nF
D6
1N4937
85-265
VAC RF1
8.2
Fusible
D3
1N4005
D4
1N4005
C1
3.3 µF
400 V
R1
1.2 k
C2
3.3 µF
400 V
U1 D
TNY264
TinySwitch-II
S
L1
2.2 mH
45
U2
LTV817
EN/UV
BP
C3
0.1 µF
R9
47
Q1
2N3904
C7
10 µF
10 V
C5
330 µF
16 V
R7
100
L2
3.3 µH
C6
100 µF
35 V
R8
270
R3
22
VR1
BZX79-
B3V9
3.9 V
R4 R6
1.2 1
1/2 W 1/2 W
+5V
500 mA
RTN
PI-2706-052301
Figure 14. 2.5 W Constant Voltage, Constant Current Battery Charger with Universal Input (85-265 VAC).
The TinySwitch-II does not require a bias winding to provide
power to the chip, because it draws the power directly from the
DRAIN pin (see 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. This type of application
normally requires a forward-bias winding which has many
more associated components. With TinySwitch-II, neither are
necessary. For applications that require a very low no-load
power consumption (50 mW), a resistor from a bias winding to
the BYPASS pin can provide the power to the chip. The
minimum recommended current supplied is 750 µA. The
BYPASS pin in this case will be clamped at 6.3 V. This method
will eliminate the power draw from the DRAIN pin, thereby
reducing the no-load power consumption and improving full-
load efficiency.
Current Limit Operation
Each switching cycle is terminated when the DRAIN current
reaches the current limit of the TinySwitch-II. Current limit
operation provides good line ripple rejection and relatively
constant power delivery independent of input voltage.
BYPASS Pin Capacitor
The BYPASS pin uses a small 0.1 µF ceramic capacitor for
decoupling the internal power supply of the TinySwitch-II.
Application Examples
The TinySwitch-II is ideal for low cost, high efficiency power
supplies in a wide range of applications such as cellular phone
chargers, PC standby, TV standby, AC adapters, motor control,
appliance control and ISDN or a DSL network termination. The
132 kHz operation allows the use of a low cost EE13 or EF12.6
core transformer while still providing good efficiency. The
frequency jitter in TinySwitch-II makes it possible to use a
single inductor (or two small resistors for under 3 W applications
if lower efficiency is acceptable) in conjunction with two input
capacitors for input EMI filtering. The auto-restart function
removes the need to oversize the output diode for short circuit
conditions allowing the design to be optimized for low cost and
maximum efficiency. In charger applications, it eliminates the
need for a second optocoupler and Zener diode for open loop
fault protection. Auto-restart also saves the cost of adding a fuse
or increasing the power rating of the current sense resistors to
survive reverse battery conditions. For applications requiring
under-voltage lock out (UVLO), such as PC standby, the
TinySwitch-II eliminates several components and saves cost.
TinySwitch-II is well suited for applications that require
constant voltage and constant current output. As TinySwitch-II
is always powered from the input high voltage, it therefore
does not rely on bias winding voltage. Consequently this greatly
simplifies designing chargers that must work down to zero volts
on the output.
7B
7/01

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관련 데이터시트

부품번호상세설명 및 기능제조사
TNY267

Low Power Off-line Switcher

Power Integrations
Power Integrations
TNY267G

Enhanced/ Energy Efficient/ Low Power Off-line Switcher

Power Integrations  Inc.
Power Integrations Inc.

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