TNY254 Power Integrations Inc., TNY254 Datasheet

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TNY254

Manufacturer Part Number
TNY254
Description
TinySwitch Family Energy Efficient/ Low Power Off-line Switchers
Manufacturer
Power Integrations Inc.
Datasheet

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TNY253/254/255
TinySwitch
Energy Efficient, Low Power Off-line Switchers
Lowest Cost, Low Power Switcher Solution
• Lower cost than RCC, discrete PWM and other
• 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
Extremely Energy Efficient
• Consumes only 30/60 mW at 115/230 VAC with no load
• Meets Blue Angel, Energy Star, Energy 2000 and
• Saves $1 to $4 per year in energy costs (at $0.12/kWHr)
• Ideal for cellular phone chargers, standby power supplies
High Performance at Low Cost
• High voltage powered – ideal for charger applications
• Very high loop bandwidth provides excellent transient
• 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
• 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
integrated/hybrid solutions
universal input or 4 W from 115 VAC input
200mW European cell phone requirements for standby
compared to bulky linear adapters
for PC, TV and VCR, utility meters, and cordless phones.
response and fast turn on with practically no overshoot
reduces EMI and video noise in TVs & VCRs
Product Highlights
®
Family
Figure 1. Typical Standby Application.
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.
TNY254P
TNY255G
TNY253G
TNY255P
TNY253P
TNY254G
NUMBER
ORDER
HV DC Input
Wide-Range
PART
TinySwitch SELECTION GUIDE
+
PACKAGE
SMD-8
SMD-8
SMD-8
DIP-8
DIP-8
DIP-8
D
S
TinySwitch
EN
BP
for Lowest System Cost*
230 VAC or
w/Doubler
Recommended Range
115 VAC
4-10 W
0-4 W
2-5 W
DC Output
3.5-6.5 W
PI-2178-022699
85-265
0-2 W
1-4 W
VAC
July 2001
+
®

Related parts for TNY254

TNY254 Summary of contents

Page 1

... And yet, they consume only about 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 ® ...

Page 2

TNY253/254/255 BYPASS 50 A OSCILLATOR CLOCK DC MAX 1 ENABLE Figure 2. Functional Block Diagram. Pin Functional Description DRAIN (D) Pin: Power MOSFET drain connection. Provides internal operating current for both start-up and steady-state operation. BYPASS ...

Page 3

Clock signal (at the beginning of each cycle high, then the power MOSFET is turned on (enabled) for that cycle, otherwise the power MOSFET remains in the ...

Page 4

TNY253/254/255 V EN CLOCK DC MAX I DRAIN V DRAIN Figure 4. TinySwitch Operation at Heavy Load. percentage of cycles will conduct to support the power consumption of the power supply. The response time of TinySwitch ON/OFF control scheme is ...

Page 5

V EN CLOCK DC MAX I DRAIN V DRAIN Figure 6. TinySwitch Operation at Light Load. 130 kHz Switching Frequency (TNY255) The switching frequency (with no cycle skipping) is set at 130kHz. This allows the TNY255 to deliver 10W while ...

Page 6

TNY253/254/255 + Optional 120-375 VDC 0. – Figure 9. 1 Stand-by Circuit using TNY253. R1 150 Optional C1 240-375 0.01 F VDC 1 kV Figure 10 ...

Page 7

... MOSFET inside the TNY254. The inductor L1 forms a -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 -filter described above in combination with a single Y1-capacitor C8 to meet worldwide conducted EMI standards. The diode D6, ...

Page 8

... The TinySwitch is not thermally limited-the source pins are soldered to sufficient copper area to keep the die temperature at or below 100 C. This limitation does not usually apply to TNY253 and TNY254. The maximum power capability of a TinySwitch depends on the thermal environment, transformer core size and design ...

Page 9

Input Filter Capacitor + HV – S TOP VIEW TinySwitch Figure 13. Recommended PC Layout for the TinySwitch. accommodated by rating the output diode to handle the short circuit current. The short circuit current can be ...

Page 10

... TNY253 EN TNY254 (MOSFET Not Switching) TNY255 See Note B TNY253 ENABLE Open TNY254 (MOSFET Switching) See Note B, C TNY255 TNY253 TNY254 J BP See Note D, E TNY255 TNY253 TNY254 J BP See Note D, E TNY255 See Note D (1) (2) ...

Page 11

... C J di/ mA/ s TNY255 See Figure TNY253 TNY254 J TNY255 TNY253 TNY254 See Note G TNY255 TNY253/TNY254 100 TNY255 100 6 560 125 C ...

Page 12

... NOTE: This test circuit is not applicable for current limit or output characteristic measurements. Figure 14. TinySwitch General Test Circuit 7/01 Conditions SOURCE = -40 to 125 C J See Figure 14 (Unless Otherwise Specified) TNY253 TNY254 See Figure 16 TNY255 and I when ENABLE pin is shorted to ground (MOSFET not switching) S1 DSS 470 5 W 470 ...

Page 13

HV 90% DRAIN VOLTAGE 10 Figure 15. TinySwitch Duty Cycle Measurement. Typical Performance Characteristics BREAKDOWN vs. TEMPERATURE 1.1 1.0 0.9 -50 - 100 125 150 Junction Temperature ( C) DC ...

Page 14

... TNY253/254/255 Typical Performance Characteristics (Continued) CURRENT LIMIT vs. TEMPERATURE 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -50 - Junction Temperature ( C) TNY254 CURRENT LIMIT vs. di/dt 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 100 150 di/dt in mA/ s BYPASS PIN START-UP WAVEFORM 0.2 0.4 0.6 Time (ms 7/01 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 1.4 200 250 300 250 200 150 100 0.8 1.0 TNY253 CURRENT LIMIT vs. di/ ...

Page 15

... DRAIN CAPACITANCE POWER 50 Scaling Factors: TNY253 1.00 TNY254 1.00 40 TNY255 1. 400 600 DIP .004 (.10 TNY253/254/255 Scaling Factors: TNY253 1.00 TNY254 1.00 TNY255 1.33 0 200 400 DRAIN Voltage (V) - 600 P08A PI-2076-040501 C 15 7/01 ...

Page 16

TNY253/254/255 D S .004 (.10 - G08A .010 (.25 7/01 SMD-8 Heat Sink is 2 oz. Copper As Big As Possible ...

Page 17

Notes TNY253/254/255 C 17 7/01 ...

Page 18

TNY253/254/255 C 18 7/01 Notes ...

Page 19

Notes TNY253/254/255 C 19 7/01 ...

Page 20

TNY253/254/255 Revision Notes Leading edge blanking time (t 2) Minimum DRAIN supply current ( Updated package reference. 2) Corrected VR1 in Figure 12. 3) Corrected storage temperature, 4) Corrected spacing and font sizes in ...

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