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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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LT1737IGN Folha de dados(PDF) 23 Page - Linear Technology |
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LT1737IGN Folha de dados(HTML) 23 Page - Linear Technology |
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23 / 28 page  23 LT1737 1737f TYPICAL APPLICATIO S APPLICATION WITH 2-WINDING TRANSFORMER The previous application example utilized a 3-winding transformer, the third winding providing only feedback information. Additional circuitry may be employed to provide feedback information, thus allowing the trans- former to be reduced to a 2-winding topology. (The cost and size savings associated with the transformer often make this a preferable alternative. Furthermore, a variety of manufacturers offer off-the-shelf dual wound magnet- ics which often can be applied as 1:1 transformers.) Figure 12 shows an LT1737 configured for operation with a dual wound toroid, the Coiltronics #CTX150-4 OCTA-PAC TM. A ground referred version of the flyback voltage waveform is now provided by components Q1, R2, R1 0.27 Ω 0.5W IRC TYPE LR 2010 M1 IRFL014 R10 5.1 Ω 5% 13 4 T1 COILTRONICS CTX150-4 VIN 2 1737 F12 R6 100k 5% R5 150k 5% C5 47pF 50V NPO 6 8 7 3 910 15 R9 33k 5% R8 240k 5% 16 2 14 13 12 4 5 11 1 C3 1nF 25V X7R R7 4.7k 5% R11 100 Ω 5% D4 1N5252 D3 MBRS1100 R4 75k 5% C1: AVX TPS TANTALUM (TPSE226M035R0300) C2: AVX TPS TANTALUM (TPSE336M025R0200) D1, D3: MOTOROLA 100V, 1A SCHOTTKY DIODE D2: SIGNAL DIODE D4: 24V, 500mW ZENER DIODE R3 3.01k 1% C8 0.1 µF 25V Z5U C4 0.1 µF 25V Z5U C6 470pF 50V X7R C7 470pF 50V X7R • • D1 MBRS1100 C2 33 µF 25V + R13 7.5k 5% VOUT 15V 250mA R12 100 Ω 5% M1: INT’L RECTIFIER 60V, 0.2 Ω N-CH MOSFET D2 BAS16 Q1 2N3906 R2 35.7k 1% C1 22 µF 35V + PGND ISENSE GATE VC FB VCC UVLO 3VOUT SGND RCMPC ROCMP MINENAB LT1737 ENDLY SFST OSCAP tON Figure 12. 12V-18V to Isolated 15V Converter ILOAD (mA) 1 60 70 80 90 10 100 1000 1737 F13 50 40 30 20 VIN = 12V VIN = 15V VIN = 18V Figure 13. Efficiency vs ILOAD ILOAD (mA) 0 15.0 VIN = 12V 1737 F14 14.5 100 200 300 15.5 VIN = 15V VIN = 18V Figure 14. Load Regulation OCTA-PAC is a trademark of Coiltronics, Inc. |
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