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FAN1582D-2.5 데이터시트(PDF) 5 Page - Fairchild Semiconductor |
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FAN1582D-2.5 데이터시트(HTML) 5 Page - Fairchild Semiconductor |
5 / 12 page PRODUCT SPECIFICATION FAN1582 REV. 1.1.2 2/26/03 5 Typical Perfomance Characteristics (continued) 6 5 4 3 2 -75 -50 -25 25 50 75 100 125 150 175 20 25 45 65 85 105 125 15 10 5 0 0 JUNCTION TEMPERATURE ( °C) CASE TEMPERATURE FREQUENCY (HZ) (VIN—VOUT) ≤ 3V 0.5V ≤ V RIPPLE ≤ 2V IOUT = 3A 90 90 70 60 50 40 30 20 10 0 10 100 1K 10K 100K Short-Circuit Current vs.Temeperature Ripple Rejection vs. Frequency Maximum Power Dissipation General The FAN1582, FAN1582-1.5, and FAN1582-2.5 are three- terminal regulators optimized for GTL+ VTT termination and logic applications. These devices are short-circuit protected, and offer thermal shutdown to turn off the regulator when the junction temperature exceeds about 150°C. The FAN1582 series provides low dropout voltage and fast transient response. Frequency compensation uses capacitors with low ESR while still maintaining stability. This is critical in addressing the needs of low voltage high speed microproces- sor buses like GTL+. VIN and VCNTL Functions The FAN1582 utilizes a dual supply approach to maximize efficiency. The collector of the power device is brought out to the VIN pin to minimize internal power dissipation under high current loads. VCNTL provides power for the control circuitry and the drive for the output NPN transistor. VCNTL should be at least 1.2 V higher than the output voltage. Special care was taken to ensure there are no supply- sequencing problems. The output voltage will not turn on until both supplies are operating. If the control voltage comes up first, the output current will be typically limited to about 3.0 mA until the power input voltage comes up. If the power input voltage comes up first the output will not turn on at all until the control voltage comes up. The output can never come up unregulated. The FAN1582 can also be used as a single supply device with the control and power inputs tied together. In this mode, the dropout is determined by the minimum control voltage. Stability The FAN1582 series requires an output capacitor as a part of the frequency compensation. It is recommended to use a 22µF solid tantalum or a 100µF aluminum electrolytic on the output to ensure stability. The frequency compensation of these devices optimizes the frequency response with low ESR capaci- tors. In general, it is suggested to use capacitors with an ESR of <0.3 Ω. It is also recommended to use bypass capacitors such as a 22µF tantalum or a 100µF aluminum on the adjust |
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