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LT1425CS Datasheet(PDF) 17 Page - Linear Technology |
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LT1425CS Datasheet(HTML) 17 Page - Linear Technology |
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17 / 20 page  17 LT1425 TYPICAL APPLICATIONS The following are several application examples of the LT1425. The first shows an isolated LAN supply which provides – 9V with ±1% load regulation for output cur- rents of 0mA to 250mA. An alternate transformer, the Coiltronics part, provides a complete PCMCIA Type II height solution. The LT1425 offers excellent load regula- tion and fast dynamic response not found in similar isolated flyback schemes. The next example shows a ±15V supply with 1.5kV of isolation. The sum of line/load/cross regulation is better than ±3%. Full load efficiency is between 72% (VIN = 5V) and 80% (VIN = 15V). The isolation is ultimately limited only by bobbin selection and transformer construction. The “– 48V to 5V Isolated Telecom Supply” uses an external cascoded 200V MOSFET to extend the LT1425’s 35V maximum switch voltage limit. The input voltage range (– 36V to – 72V) also exceeds the LT1425’s 20V maximum input voltage, so a bootstrap winding is used. D1, D2, Q2 and Q3 and associated components for the necessary start-up circuitry with hysteresis. When C1 charges to 15V, switching begins and the bootstrap wind- ing begins to supply power before C1 has a chance to discharge to 11V. Feedback voltage is fed directly through a resistor divider to the RREF pin. The load compensation circuitry is bypassed, resulting in ±5% load regulation. Finally, the “12V to 5V Isolated Converter” is similar to the previous example in that a cascoded MOSFET is used to prevent voltage breakdown of the output switch. But because the nominal 12V input is well within the range of the VIN pin, no bootstrap winding is required and normal load compensation function is provided. Diode D1, tran- sistor Q1 and associated components provide an under- voltage lockout function via the SHDN pin. The off-the- shelf transformer provides up to 5W of isolated regulated power. – 9V Isolated LAN Supply Transformer T1 LPRI RATIO ISOLATION (L × W × H) IOUT EFFICIENCY D1 D2 R1, R2 C5, C6 R3 DALE LPE-4841-A307 36 µH 1:1:1 500VAC 10.7 × 11.5 × 6.3mm 250mA 76% NOT USED NOT USED 47 Ω 330pF 13.3k COILTRONICS CTX02-13483 27 µH 1:1 500VAC 14 × 14 × 2.2mm 200mA 70% 1N5248 MBR0540TL1 75 Ω 220pF 5.9k 1424/25 TA03 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GND NC RFB VC RREF SYNC SGND GND 3.01k 1% R3 R1 R2 2 4 1 3 7 MBRS130LT3 T1 6 22.1k 1% 0.1 µF LT1425 47pF C5 C6 C3 10 µF 25V C4 10 µF 25V 1.8k OUT COM –9V 1000pF C1 10 µF 25V 5V INPUT COM C2 10 µF 25V 0.1 µF 100k GND SHDN ROCOMP RCCOMP VIN VSW PGND GND C1, C2, C3, C4 = MARCON THCS50E1E106Z CERAMIC CAPACITOR, SIZE 1812. (847) 696-2000 D1 D2 |
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