TNY255 POWERINT [Power Integrations, Inc.], TNY255 Datasheet
TNY255
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TNY255 Summary of contents
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... 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 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 ...
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... Figure 2 shows a functional block diagram with the most important features. Oscillator The oscillator frequency is internally set at 44 kHz (130 kHz for the TNY255). The two signals of interest are the Maximum Duty Cycle signal (D MAX cycle and the Clock signal that indicates the beginning of each cycle ...
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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 ...
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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 ...
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... 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 still using the same size, low cost transformer (EE16) as used by the TNY253/254 for lower power applications. ...
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... S LTV817 C3 0.1 F with the integrated high voltage MOSFET inside the TNY255. The diode D1, capacitor C2 and resistor R1 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 D2 and C4 to provide the 5V ouput. Additional filtering is provided by L1 and C5 ...
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D1 D2 1N4005 1N4005 85-265 C1 C2 RF1 VAC 6 400 V 400 V Fusible R1 1 1N4005 1N4005 L1 560 H Figure 11. 3.6 W Constant Voltage-Constant Current Cellular Phone Charger Circuit. ...
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TNY253/254/255 is provided by L2 and C6. The output voltage is determined by the sum of the optocoupler U2 LED forward drop (~ 1V) and Zener diode VR1 voltage. The resistor R8, maintains a bias current through the Zener to ...
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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 ...
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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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... C J TNY253 TNY254 J TNY255 TNY253 TNY254 See Note G TNY255 TNY253/TNY254 100 TNY255 100 6 560 125 6 100 ...
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... 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 0.1 F Max Min Typ ...
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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 LIMIT(MIN 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 C 13 7/01 ...
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... 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/dt 0 12.5 25 37.5 50 62.5 75 87.5 100 di/dt in mA/ s 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/ s OUTPUT CHARACTERISTIC T =25 C CASE T =100 C CASE Scaling Factors: TNY253 1.00 50 TNY254 1.00 TNY255 1. ...
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... 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 ...
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TNY253/254/255 D S .004 (.10 - G08A .010 (.25 7/01 SMD-8 Heat Sink is 2 oz. Copper As Big As Possible ...
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Notes TNY253/254/255 C 17 7/01 ...
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TNY253/254/255 C 18 7/01 Notes ...
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Notes TNY253/254/255 C 19 7/01 ...
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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, 4) Corrected spacing and font sizes in ...