V out1 V in GND in GND out C1 L1 C2 D1 J1 U1 LM2575 LM2575 NCV2575

V out1 v in gnd in gnd out c1 l1 c2 d1 j1 u1 lm2575

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+V out1 +V in GND in GND out C1 L1 C2 D1 J1 U1 LM2575
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LM2575, NCV2575 24 THE LM2575 ADJ STEP DOWN VOLTAGE REGULATOR WITH 8.0 V @ 1.0 A OUTPUT POWER CAPABILITY. TYPICAL APPLICATION WITH THROUGH HOLE PC BOARD LAYOUT C1 100  m F, 50 V, Aluminium Electrolytic C2 330  m F, 16 V, Aluminium Electrolytic C3 100  m F, 16 V, Aluminium Electrolytic D1 1.0 A, 40 V, Schottky Rectifier, 1N5819 L1 330  m H, Tech 39: 77 458 BV, Toroid Core, Through Hole, Pin 3 = Start, Pin 7 = Finish L2 25  m H, TDK: SFT52501, Toroid Core, Through Hole R1 1.8 k R2 10 k Figure 38. Schematic Diagram of the 8.0 V @ 1.0 V Step Down Converter Using the LM2575 Adj (An additional LC filter is included to achieve low output ripple voltage) Figure 39. PC Board Component Side Figure 40. PC Board Copper Side V ref = 1.23 V R1 is between 1.0 k and 5.0 k D1 1N5819 L1 330 mH Output 2 R2 10 k R1 1.8 k L2 25 mH Regulated Output Filtered V out2 = 8.0 V @1.0 A Unregulated DC Input C2 330 mF /16 V C3 100 mF /16 V C1 100 mF /50 V LM2575 Adj 1 5 3ON/OFF GND +V in +V in = +10 V to + 40 V 4 Feedback Regulated Output Unfiltered V out1 = 8.0 V @1.0 A V out + V ref ) ǒ 1 ) R2 R1 Ǔ +V out1 +V in GND in C1 L1 C2 D1 J1 U1 LM2575 L2 C3 +V out2 R2 R1 GND out NOTE: Not to scale. NOTE: Not to scale . References National Semiconductor LM2575 Data Sheet and Application Note National Semiconductor LM2595 Data Sheet and Application Note Marty Brown “Practical Switching Power Supply Design”, Academic Press, Inc., San Diego 1990 Ray Ridley “High Frequency Magnetics Design”, Ridley Engineering, Inc. 1995
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LM2575, NCV2575 25 ORDERING INFORMATION Device Nominal Output Voltage Operating Temperature Range Package Shipping LM2575TV ADJG 1.23 V to 37 V T J   40  to +125 C TO 220 (Vertical Mount) (Pb Free) 50 Units/Rail LM2575T ADJG TO 220 (Straight Lead) (Pb Free) LM2575D2T ADJG D 2 PAK (Surface Mount) (Pb Free) LM2575D2T ADJR4G D 2 PAK (Surface Mount) (Pb Free) 800 Tape & Reel NCV2575D2T ADJG D 2 PAK (Surface Mount) (Pb Free) 50 Units/Rail NCV2575D2T ADJR4G D 2 PAK (Surface Mount) (Pb Free) 800 Tape & Reel LM2575TV 3.3G 3.3 V T J   40  to +125 C TO 220 (Vertical Mount) (Pb Free) 50 Units/Rail LM2575T 3.3G TO 220 (Straight Lead) (Pb Free) LM2575D2T 3.3G D 2 PAK (Surface Mount) (Pb Free) LM2575D2T 3.3R4G D 2 PAK (Surface Mount) (Pb Free) 800 Tape & Reel LM2575TV 5G 5.0 V T J   40  to +125 C TO 220 (Vertical Mount) (Pb Free) 50 Units/Rail LM2575T 5G TO 220 (Straight Lead) (Pb Free) LM2575D2T 5G D 2 PAK (Surface Mount) (Pb Free) LM2575D2T 5R4G D 2 PAK (Surface Mount) (Pb Free) 800 Tape & Reel NCV2575D2T 5G D 2 PAK (Surface Mount) (Pb Free) 50 Units/Rail NCV2575D2T 5R4G D 2 PAK (Surface Mount) (Pb Free) 800 Tape & Reel LM2575TV 012G 12 V T J   40  to +125 C TO 220 (Vertical Mount) (Pb Free) 50 Units/Rail LM2575T 012G TO 220 (Straight Lead) (Pb Free) LM2575D2T 012G D 2
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