전자부품 데이터시트 검색엔진 |
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AD680 데이터시트(PDF) 10 Page - Analog Devices |
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AD680 데이터시트(HTML) 10 Page - Analog Devices |
10 / 12 page AD680 Rev. H | Page 10 of 12 4.5 V REFERENCE FROM A 5 V SUPPLY The AD680 can be used to provide a low power, 4.5 V reference, as shown in Figure 19. In addition to the AD680, the circuit uses a low power op amp and a transistor in a feedback con- figuration that provides a regulated 4.5 V output for a power supply voltage as low as 4.7 V. The high quality tantalum 10 μF capacitor (C1) in parallel with the ceramic 0.1 μF capacitor (C2) and the 3.9 Ω resistor (R5) ensure a low output impedance up to approximately 50 MHz (see Figure 19). 6 3 2 7 4 OP90 +IN V+ V– OUT –IN R1 2k Ω 1% CF 0.1 μF R4 3.57k Ω R2 2.5k Ω 1% AD680 VOUT GND VIN 0.1 μF R3 1k Ω CC 3.3 μF 2N2907A 4.7V TO 15V C1 10 μF + C2 0.1 μF R5 3.9 Ω Figure 19. 4.5 V Reference Running from a Single 5 V Supply VOLTAGE REGULATOR FOR PORTABLE EQUIPMENT The AD680 is ideal for providing a stable, low cost, low power reference voltage in portable equipment power supplies. Figure 20 shows how the AD680 can be used in a voltage regulator that not only has low output noise (as compared to a switch mode design) and low power, but it also has a very fast recovery after current surges. Some caution should be taken in the selection of the output capacitors. Too high an ESR (effective series resistance) could endanger the stability of the circuit. A solid tantalum capacitor, 16 V or higher, and an aluminum electro- lytic capacitor, 10 V or higher, are recommended for C1 and C2, respectively. Also, the path from the ground side of C1 and C2 to the ground side of R1 should be kept as short as possible. 2 3 7 6 4 OP777 + – R3 510k Ω IRF9530 AD680 VOUT GND VIN C1 68 μF TANT + C2 1000 μF ELECT + 2 6 TEMP 3 4 0.1 μF CHARGER INPUT 6V LEAD-ACID BATTERY + R2 402k Ω 1% R1 402k Ω 1% Figure 20. Voltage Regulator for Portable Equipment |
유사한 부품 번호 - AD680_15 |
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유사한 설명 - AD680_15 |
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