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LM5181-Q1 Folha de dados(PDF) 20 Page - Texas Instruments |
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LM5181-Q1 Folha de dados(HTML) 20 Page - Texas Instruments |
20 / 33 page § · § · : ˜ ˜ : ¨ ¸ ¨ ¸ : © ¹ © ¹ UV1 IN(off) UV-FALLING UV-HYST UV1 UV2 R 536k V V 1 I R 1.45 V 1 5 $ N 9 R 100k § · § · : ¨ ¸ ¨ ¸ : © ¹ © ¹ UV1 IN(on) UV-RISING UV2 R 536 k V V 1 1.5 V 1 9.54 V R 100k ˜ : ˜ : UV-RISING UV2 UV1 IN(on) UV-RISING V 1.5 V R R 536 k 100 k V V 9.5 V 1.5 V ˜ ˜ : UV-FALLING IN(on) IN(off) UV-RISING UV1 UV-HYST V 1.45 V V V 9.5 V 6.5 V V 1.5 V R 536k I 5 $ : ª º ¬ ¼ : ˜ ˜ : ª º ¬ ¼ q ª º ¬ ¼ FB TC PS Diode R k 3 158 3 R k 130 k N TC mV C 3 1.2 OUT D PS FB V V N 5 V 0.3 V 3 R 158 k 0.1 mA 0.1 mA ˜ ˜ : PRI-PK CIN-RMS D I 4 I 1 2 3 D ˜ ˜ ˜ 20 LM5181-Q1 SNVSBN6 – APRIL 2020 www.ti.com Product Folder Links: LM5181-Q1 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated Substituting the input current at full load, switching frequency, peak primary current, and peak-to-peak ripple specification gives CIN greater than 1 μF. Mindful of the voltage coefficient of ceramic capacitors, select a 2.2-µF, 100-V ceramic input capacitor with X7R dielectric in 1210 case size. Equation 25 gives the input capacitor RMS ripple current. (25) 9.2.1.2.8 Feedback Resistor – RFB Select a feedback resistor, designated RFB, of 158 kΩ based on the secondary winding voltage at the end of the flyback conduction interval (the sum of the 5-V output voltage and the Schottky diode forward voltage drop) reflected by the transformer turns ratio of 3 : 1. The forward voltage drop of the flyback diode is 0.3 V as its current approaches zero. (26) 9.2.1.2.9 Thermal Compensation Resistor – RTC Select a resistor for output voltage thermal compensation, designated RTC, based on Equation 27. (27) 9.2.1.2.10 UVLO Resistors – RUV1, RUV2 Given VIN(on) and VIN(off) as the input voltage turn-on and turn-off thresholds of 9.5 V and 6.5 V, respectively, select the upper and lower UVLO resistors using the following expressions: (28) (29) Calculate the actual input turn-on and turn-off voltage thresholds as follows: (30) (31) 9.2.1.2.11 Soft-Start Capacitor – CSS Connect an external soft-start capacitor for a specific soft-start time. In this example, select a soft-start capacitance of 47 nF based on Equation 12 to achieve a soft-start time of 8 ms. For technical solutions, industry trends, and insights for designing and managing power supplies, please refer to TI's Power Management technical articles. |
Nº de peça semelhante - LM5181-Q1 |
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Descrição semelhante - LM5181-Q1 |
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