tny253 Power Integrations, Inc., tny253 Datasheet

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tny253

Manufacturer Part Number
tny253
Description
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
265 VAC 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
200 mW 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 2.5 W.
TNY255 uses higher switching rate of 130 kHz 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 2.5 W.
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.
NUMBER
TNY253P
TNY253G
TNY254P
TNY254G
TNY255P
TNY255G
ORDER
HV DC Input
Wide-Range
PART
TinySwitch SELECTION GUIDE
+
PACKAGE
DIP-8
SMD-8
SMD-8
DIP-8
SMD-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
April 2003
+
®

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tny253 Summary of contents

Page 1

... 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 The TNY253 is identical to TNY254 except for its lower current limit, which reduces output short circuit current for applications under 2.5 W. ...

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 (BP) Pin: Connection point for an external bypass capacitor for the internally generated 5 ...

Page 3

... At loads less than full load, the TinySwitch will “skip” more cycles in order to maintain voltage regulation at the secondary output (Figure 5). At light load or by the oscillator. no load, almost all cycles will be skipped (Figure 6). A small MAX TNY253/254/255 limit is reached. MAX D 3 4/03 ...

Page 4

... 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 ...

Page 5

... T1 and the integrated high voltage MOSFET inside the TNY253. The low operating frequency of the TNY253 (44 kHz), allows a low cost snubber circuit C2 and used in place of a primary clamp circuit. In addition to limiting the DRAIN turn off voltage spike to a ...

Page 6

... TNY253/254/255 + Optional 120-375 VDC 0.01 µ Figure 9. 1 Standby Circuit using TNY253. R1 150 Optional C1 240-375 0.01 F VDC 1 kV Figure 10 Standby Supply Circuit Standby The TNY255 is ideal for standby applications that require power from 230 VAC or 100/115 VAC with doubler circuit ...

Page 7

... 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 5.2 V output. Additional filtering TNY253/254/255 L2 3 ...

Page 8

... Figure 12 shows 0 adapter circuit using the TNY253. This circuit operates from a 115 VAC input. To save cost, this circuit runs without any feedback, in discontinuous conduction mode to deliver constant power output relatively independent of input voltage ...

Page 9

... Figure 13) terminal of the output filter capacitor should be connected with a short, low resistance path to the secondary winding. In addition, the common/return output connection should be taken directly from the secondary winding pin and not from the Y-capacitor connection point. TNY253/254/255 Maximize hatched copper + areas ( ) for optimum ...

Page 10

... TNY253/254/255 DRAIN Voltage ....................................... - 0 700 V Peak DRAIN Current (TNY253/4) ........................400 mA Peak DRAIN Current (TNY255) ...........................530 mA ENABLE Voltage ........................................ - 0 ENABLE Current ...................................................100 mA BYPASS Voltage .......................................... -0 All voltages referenced to SOURCE Normally limited by internal circuitry. 3. 1/16" from case for 5 seconds. Parameter ...

Page 11

... 560 125 ° 6 100 µ ° Measured with Figure 10 Schematic. TNY253/254/255 Min Typ Max Units 135 150 165 230 255 280 mA 255 280 310 0. LIMIT(MIN) 170 240 ns 170 ...

Page 12

... NOTE: This test circuit is not applicable for current limit or output characteristic measurements. Figure 14. TinySwitch General Test Circuit 4/03 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 Ω 470 Ω ...

Page 13

... Figure 16. TinySwitch Output Enable Timing. t LEB (Blanking Time) 1.3 1.2 1.1 1.0 0.9 0.8 0.8 0.7 I INIT(MIN) 0.6 0.5 0.4 I LIMIT(MAX °C I LIMIT(MIN °C 0.3 0.2 0 Time ( s) Figure 17. Current Limit Envelope. FREQUENCY vs. TEMPERATURE TNY253/254/255 for TNY253/254 for TNY255 7 8 1.2 1.0 0.8 0.6 0.4 0.2 0 -50 - 100 125 Junction Temperature (°C) PI-2194-062398 D 13 4/03 ...

Page 14

... Time (ms 4/03 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/dt 0 12.5 25 37.5 50 62.5 75 87.5 100 di/dt in mA/µs TNY255 CURRENT LIMIT vs. di/dt 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0 160 320 480 640 di/dt in mA/µs OUTPUT CHARACTERISTIC T =25 °C CASE T =100 °C CASE Scaling Factors: TNY253 1 ...

Page 15

... D, E and F are reference datums on the molded body. 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-2076-101102 D 15 4/03 ...

Page 16

... TNY253/254/255 D S .004 (.10 - G08A .010 (.25 4/03 SMD-8 .046 .060 .060 .046 Pin 1 .086 .186 -D- .286 Solder Pad Dimensions -F- .004 (.10) α DIM inches mm A 0.367-0.387 9.32-9.83 B 0.240-0.260 6.10-6.60 C 0.125-0.145 3.18-3.68 G 0.004-0.012 ...

Page 17

... Notes TNY253/254/255 D 17 4/03 ...

Page 18

... TNY253/254/255 D 18 4/03 Notes ...

Page 19

... Notes TNY253/254/255 D 19 4/03 ...

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, θ 4) Corrected spacing and font sizes in figures Corrected θ for P/G package Updated DIP-8 and SMD-8 Package Drawings. ...

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