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MC34268D 데이터시트(PDF) 3 Page - ON Semiconductor |
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MC34268D 데이터시트(HTML) 3 Page - ON Semiconductor |
3 / 8 page MC34268 http://onsemi.com 3 Figure 3. Typical SCSI Application 1N5819 To SCSI Bus MC34268 SCSI Regulator 110 Ω 10 10 5.0V Vin VO Gnd CO Figure 3 is a circuit of a typical SCSI terminator application. The MC34268 is designed specifically to provide 2.85 V required to drive a SCSI–2 bus. The output current capability of the regulator is in excess of 800 mA; enough to drive standard SCSI–2, fast SCSI–2, and some wide SCSI–2 applications. The typical dropout voltage is less than 1.0 V, allowing the IC to regulate to input voltages less than 4.0 V. Internal protective features include current and thermal limiting. The MC34268 requires an external 10 µF capacitor with an ESR of less than 10 Ω for stability over temperature. With economical electrolytic capacitors, cold temperature operation can pose a stability problem. As temperature decreases, the capacitance also decreases and the ESR increases, which could cause the circuit to oscillate. Tantalum capacitors may be a better choice if small size is a requirement. Also, the capacitance and ESR of a tantalum capacitor is more stable over temperature. Figure 4. SOP–8 Thermal Resistance versus P.C.B. Copper Length 0 1020 3040 L, LENGTH OF COPPER (mm) Figure 5. DPAK Thermal Resistance versus P.C.B. Copper Length 0 102030405060 L, LENGTH OF COPPER FLAGS (mm) 70 90 80 70 60 50 40 180 160 120 80 40 0 L L 2.0 oz Copper L 9.0 mm P.C. Board Heatsink Example L L 2.0 oz Copper P.C. Board Heatsink Example ORDERING INFORMATION Device Package Shipping Information MC34268D SO–8 98 Units / Rail MC34268DR2 SO–8 2500 Units / Tape & Reel MC34268DT DPAK 75 Units / Rail MC34268DTRK DPAK 2500 Units / Tape & Reel MC34268STT3 SOT–223 4000 Units / Tape & Reel |
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