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LM25183 Datasheet(PDF) 25 Page - Texas Instruments |
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LM25183 Datasheet(HTML) 25 Page - Texas Instruments |
25 / 39 page t IN(max) D2-REV OUT2 PS2 V 42 V V V 15 V 79 V N 1 1.5 t IN(max) D1-REV OUT1 PS1 V 42 V V V 15 V 79 V N 1 1.5 -° ® ª º ª º °¯ ˜ ˜ « » « » ¬ ¼ « » ¬ ¼ IN SW-PEAK OUT(max) OUT D IN IN PS IN 0.24 A at V 13.5 V I 2.5 A I V V 1 0.29 A at V 24 V 30 V 0.4 V 1 2 2 V N V 1 3 ˜ ˜ ˜ ˜ t OUT D PS OFF-MIN MAG SW-PEAK(FFM) V V N t 15 V + 0.3 V 1 1.5 375ns L 7.7 + I 0.5 A ˜ ˜ IN(min) MAX PS MAX OUT D V D 0.7 4.5 V N 0.69 1 D V V 1 0.7 15 V + 0.3 V 25 LM25183 www.ti.com SNVSBJ3 – APRIL 2020 Product Folder Links: LM25183 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated Table 5. List of Components for Design 2 REF DES QTY SPECIFICATION VENDOR PART NUMBER CIN 1 10 µF, 50 V, X7R, 1210, ceramic TDK C3225X7R1H106M250AC Taiyo Yuden UMK325AB7106KM-T COUT1, COUT2 4 22 µF, 25 V, X7R, 1210, ceramic TDK C3225X7R1E226M250AB Taiyo Yuden TMK325B7226MM-PR DCLAMP 1 Zener, 20 V, 3 W, SMA 3SMAJ5932B Micro Commercial DF 1 Schottky diode, 60 V, 3 A, SOD-123FL FSV360FP OnSemi DFLY1, DFLY2 2 Schottky diode, 100 V, 1 A, POWERDI123 DFLS1100-7 Diodes Inc. DOUT1, DOUT2 2 Zener, 18 V, 5%, SOD-523 BZX585-C18 Nexperia RFB 1 102 kΩ, 1%, 0402 Std Std RSET 1 12.1 kΩ, 1%, 0402 Std Std RTC 1 221 kΩ, 1%, 0402 Std Std T1 1 9 µH, 3 A, 1 : 1.5 : 1.5, 13 mm × 11 mm × 10 mm Coilcraft ZB1056-AE U1 1 LM25183 PSR flyback converter, VSON-8 Texas Instruments LM25183NGUR 8.2.3.2 Detailed Design Procedure Using the LM25183 quick-start calculator, components are selected based on the flyback converter specifications. 8.2.3.2.1 Flyback Transformer – T1 Choose a primary-secondary turns ratio for a 15-V output based on an approximate 70% max duty cycle at minimum input voltage using Equation 33. The transformer turns ratio when considering both outputs is thus specified as 1 : 1.5 : 1.5. (33) Select a magnetizing inductance based on the minimum off-time constraint using Equation 34. Choose a value of 9 µH and a saturation current of 3 A for this application. (34) Find the maximum output current for a given turns ratio, assuming the outputs are symmetrically loaded, using Equation 35. (35) 8.2.3.2.2 Flyback Diodes – DFLY1 and DFLY2 The flyback diode reverse voltages for the positive and negative outputs are given respectively by Equation 36 and Equation 37. (36) (37) |
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