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부품번호 TNY253P 기능
기능 TinySwitch Family Energy Efficient/ Low Power Off-line Switchers
제조업체 Power Integrations Inc.
로고 Power Integrations  Inc. 로고


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TNY253P 데이터시트, 핀배열, 회로
TNY253/254/255
TinySwitch® Family
Energy Efficient, Low Power Off-line Switchers
®
Product Highlights
Lowest Cost, Low Power Switcher Solution
Lower cost than RCC, discrete PWM and other
integrated/hybrid solutions
Cost effective replacement for bulky linear adapters
Lowest component count
Simple ON/OFF control no loop compensation devices
No bias winding simpler, lower cost transformer
Allows simple RC type EMI filter for up to 2 W from
universal input or 4 W from 115 VAC input
Extremely Energy Efficient
Consumes only 30/60 mW at 115/230 VAC with no load
Meets Blue Angel, Energy Star, Energy 2000 and
200mW European cell phone requirements for standby
Saves $1 to $4 per year in energy costs (at $0.12/kWHr)
compared to bulky linear adapters
Ideal for cellular phone chargers, standby power supplies
for PC, TV and VCR, utility meters, and cordless phones.
High Performance at Low Cost
High voltage powered ideal for charger applications
Very high loop bandwidth provides excellent transient
response and fast turn on with practically no overshoot
Current limit operation rejects line frequency ripple
Glitch free output when input is removed
Built-in current limit and thermal protection
44 kHz operation (TNY253/4) with snubber clamp
reduces EMI and video noise in TVs & VCRs
Operates with optocoupler or bias winding feedback
Description
The TinySwitch family uses a breakthrough design to provide
the lowest cost, high efficiency, off-line switcher solution in the
0 to 10 W range. These devices integrate a 700 V power
MOSFET, oscillator, high voltage switched current source,
current limit and thermal shutdown circuitry. They start-up and
run on power derived from the DRAIN voltage, eliminating the
need for a transformer bias winding and the associated circuitry.
And yet, they consume only about 80 mW at no load, from
265VAC input. A simple ON/OFF control scheme also
eliminates the need for loop compensation.
The TNY253 and TNY254 switch at 44 kHz to minimize EMI
and to allow a simple snubber clamp to limit DRAIN spike
+
Wide-Range
HV DC Input
TinySwitch
D
EN
BP
S
Figure 1. Typical Standby Application.
+
DC Output
PI-2178-022699
TinySwitch SELECTION GUIDE
ORDER
PART
NUMBER
TNY253P
TNY253G
TNY254P
TNY254G
TNY255P
TNY255G
PACKAGE
DIP-8
SMD-8
DIP-8
SMD-8
DIP-8
SMD-8
Recommended Range
for Lowest System Cost*
230 VAC or
115 VAC
w/Doubler
85-265
VAC
0-4 W
0-2 W
2-5 W
1-4 W
4-10 W 3.5-6.5 W
Table 1. *Please refer to the Key Application Considerations section
for details.
voltage. At the same time, they allow use of low cost EE16 core
transformers to deliver up to 5 W. The TNY253 is identical to
TNY254 except for its lower current limit, which reduces
output short circuit current for applications under 2.5W.
TNY255 uses higher switching rate of 130kHz to deliver up to
10 W from the same low cost EE16 core for applications such
as PC standby supply. An EE13 or EF13 core with safety
spaced bobbin can be used for applications under 2.5W.
Absence of a bias winding eliminates the need for taping/
margins in most applications, when triple insulated wire is used
for the secondary. This simplifies the transformer construction
and reduces cost.
July 2001




TNY253P pdf, 반도체, 판매, 대치품
TNY253/254/255
VEN
CLOCK
DCMAX
IDRAIN
VEN
CLOCK
DCMAX
IDRAIN
VDRAIN
VDRAIN
Figure 4. TinySwitch Operation at Heavy Load.
PI-2255-061298
percentage of cycles will conduct to support the power
consumption of the power supply.
The response time of TinySwitch ON/OFF control scheme is
very fast compared to normal PWM control. This provides high
line ripple rejection and excellent transient response.
Power Up/Down
TinySwitch requires only a 0.1 µF capacitor on the BYPASS
pin. Because of the small size of this capacitor, the power-up
delay is kept to an absolute minimum, typically 0.3 ms (Figure7).
Due to the fast nature of the ON/OFF feedback, there is no
overshoot at the power supply output. During power-down, the
power MOSFET will switch until the rectified line voltage
drops to approximately 12 V. The power MOSFET will then
remain off without any glitches (Figure 8).
Bias Winding Eliminated
TinySwitch does not require a bias winding to provide power to
the chip. Instead 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 an extra bias winding and associated components. Secondly,
for charger applications, the current-voltage characteristic often
allows the output voltage to fall to low values while still
delivering power. This type of application normally requires a
forward-bias winding which has many more associated
components, none of which are necessary with TinySwitch.
Current Limit Operation
Each switching cycle is terminated when the DRAIN current
reaches the current limit of the TinySwitch. For a given primary
4C
7/01
Figure 5. TinySwitch Operation at Medium Load.
PI-2259-061298
inductance and input voltage, the duty cycle is constant.
However, duty cycle does change inversely with the input
voltage providing voltage feed-forwardadvantages: good
line ripple rejection and relatively constant power delivery
independent of the input voltage.
44 kHz Switching Frequency (TNY253/254)
Switching frequency (with no cycle skipping) is set at 44kHz.
This provides several advantages. At higher switching
frequencies, the capacitive switching losses are a significant
proportion of the power losses in a power supply. At higher
frequencies, the preferred snubbing schemes are RCD or diode-
Zener clamps. However, due to the lower switching frequency
of TinySwitch , it is possible to use a simple RC snubber (and
even just a capacitor alone in 115VAC applications at powers
levels below 4W).
Secondly, a low switching frequency also reduces EMI filtering
requirements. At 44kHz, the first, second and third harmonics
are all below 150kHz where the EMI limits are not very
restrictive. For power levels below 4W it is possible to meet
worldwide EMI requirements with only resistive and capacitive
filter elements (no inductors or chokes). This significantly
reduces EMI filter costs.
Finally, if the application requires stringent noise emissions
(such as video applications), then the TNY253/254 will allow
more effective use of diode snubbing (and other secondary
snubbing techniques). The lower switching frequency allows
RC snubbers to be used to reduce noise, without significantly
impacting the efficiency of the supply.

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TNY253P 전자부품, 판매, 대치품
TNY253/254/255
D1 D2
1N4005 1N4005
R2
100 k
1W
85-265
VAC RF1
10
C1 C2
6.8 µF 4.7 µF
400 V 400 V
Fusible
D3 D4
1N4005 1N4005
R1
1.2 k
D5
T1 FR201
1 10
C4
2200 pF
25
D6
1N4937
TinySwitch
D
EN
U1
TNY254P
BP U2
LTV817
S
C5
220 µF
25 V
R7
100
C3
0.1 µF
R9
47 R3
Q1 22
2N3904
R5
18
1/8 W
L2
3.3 µH
C6
220 µF
16 V
R8
820
VR1
1N5230B
4.7 V
L1
560 µH
C8
2.2 nF
Y1 Safety
R4 R6
1 0.82
1 W 1/2 W
Figure 11. 3.6 W Constant Voltage-Constant Current Cellular Phone Charger Circuit.
+ 5.2 V
RTN
PI-2244-082898
D1
1N4004
115 VAC
± 15%
C1
2.2 µF
200 V
RF1 D2
1.8 1N4004
Fusible
C2
2.2 µF
200 V
C4
68 pF
1 KV
R2
100
D3
T1 1N3934
1 10
C6
100 µF
16V
56
TinySwitch
D
U1 EN
TNY253P BP
S
C3
0.1 µF
C5
2.2 nF
Y1 Safety
Figure 12. 0.5 W Open Loop AC Adapter Circuit.
VR1
1N5239B
+9V
RTN
PI-2190-031501
constant voltage and constant current output. TinySwitch is
always powered from the input high voltage, therefore it does
not require bias winding for power. Consequently, its operation
is not dependent on the level of the output voltage. This allows
for constant current charger designs that work down to zero
volts on the output.
Figure11 shows a 5.2V, 3.6W cellular phone charger circuit
that uses the TNY254 and provides constant voltage and constant
current output over an universal input (85 to 265VAC) range.
The AC input is rectified and filtered by D1 - D4, C1 and C2 to
create a high voltage DC bus connected to T1 in series with the
high voltage MOSFET inside the TNY254. The inductor L1
forms a π-filter in conjunction with C1 and C2. The resistor R1
damps resonances in the inductor L1. The low frequency of
operation of TNY254 (44kHz) allows use of the simple π-filter
described above in combination with a single Y1-capacitor C8
to meet worldwide conducted EMI standards. The diode D6,
capacitor C4 and resistor R2 comprise the clamp circuit that
limits the turn-off voltage spike on the TinySwitch DRAIN pin
to a safe value. The secondary winding is rectified and filtered
by D5 and C5 to provide the 5.2V output. Additional filtering
7C
7/01

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