tny253 Power Integrations, Inc., tny253 Datasheet
tny253
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tny253 Summary of contents
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... 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. ...
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... 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 ...
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... 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 ...
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... 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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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... 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 ...
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... Notes TNY253/254/255 D 17 4/03 ...
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... TNY253/254/255 D 18 4/03 Notes ...
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... Notes TNY253/254/255 D 19 4/03 ...
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... 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. ...