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LT1725IGN データシート(PDF) 22 Page - Linear Technology |
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LT1725IGN データシート(HTML) 22 Page - Linear Technology |
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22 / 28 page  22 LT1725 1725f TYPICAL APPLICATIO S Figure 9. 48V to Isolated 15V Converter R2 0.1 Ω M1 IRF620 T1 VP5-0155 R12 5.1 Ω VOUT 15V 1725 F09a R7 51k R6 51k C7 47pF 63 14 10 9 8 7 13 12 4 5 15 11 1 2 16 C6 1nF R8 6.2k R11 150 Ω D3 1N5257 D4 1N5257 D2 MBRS1100 R10 18 Ω VIN R1 24k C1 22 µF R14 820k R15 33k R9 51 Ω R5 51k R4 3.01k 1% R3 34.0k 1% C8 0.1 µF + C4 150 µF D1 MBRD660 D5 BAS16 + C9 470pF C3 100pF C2 1.5 µF ×3 8 5 9 4 1 12 2 11 10 3 6 7 C5 1 µF R13 750 Ω 1W C10 100pF • •• • • • PGND ISENSE GATE VC FB VCC UVLO 3VOUT SGND RCMPC ROCMP MENAB LT1725 ENDLY SFST OSCAP tON VERSA-PAK is a trademark of Coiltronics, Inc TELECOM 48V TO ISOLATED 15V APPLICATION The design in Figure 9 accepts an input voltage in the range of 36V to 72V and outputs an isolated 15V at up to 2A. Transformer T1 is an off-the-shelf VERSA-PAK TM #VP5-0155, produced by Coiltronics. As manufactured, it consists of six ideally identical independent windings. In this application, three windings are stacked in series on the primary side and two are placed in parallel on the secondary side. This arrangement provides a 3:1 primary- to-secondary turns ratio while maximizing overall effi- ciency. The remaining winding provides a primary-side ground-referred version of the flyback voltage waveform for both feedback information and providing power to the LT1725 itself. Capacitor C7 sets the switching frequency at approxi- mately 200kHz. Optimal load compensation for the trans- former and secondary circuit components is set by resistor R8. Output voltage regulation and overall efficiency are shown in the accompanying graphs. The resistor divider formed by R14 and R15 sets the undervoltage lockout threshold at about 32V, with a hysteresis band of about 2V. The soft-start and 3VOUT features are unused as shown. |
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