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ADR370 Folha de dados(PDF) 8 Page - Analog Devices |
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ADR370 Folha de dados(HTML) 8 Page - Analog Devices |
8 / 12 page REV. A –8– ADR370 12-Bit Precision Programmable Current Source By replacing the potentiometer in Figure 6 with a 12-bit precision DAC like the AD5322, a higher precision programmable current source can be achieved. Figure 7 illustrates the implementation of this circuit. The load current can be determined with the following equation. I VD R L REF SET = − () × 1 4096 (6) The compliance voltage should be kept low so that the supply voltage to U2, between VDD and GND, does not fall below 2.5 V. VIN U1 U2 +5V V+ V– 1 11 U3 2 3 VREF (1 – D2/N) +5V OP1177 AD5322 –5V ADR370 VOUT GND +5V VL RL RSET TOL ±0.05% IL VIN VDD VO GND Figure 7. 12-Bit Programmable Current Source Precision Boosted Output Regulator A precision voltage output with boosted current can be realized with the circuit shown in Figure 8. In this circuit, VO is maintained by the ADR370 at 2.048 V. The ADR370 sources a maximum of 5 mA if the load current, IL, is more than 5 mA, current is furnished by the transistor, Q1, and the input voltage supply VDD. VIN R1 10k RL IL ADR370 VOUT GND VDD Q1 2N3906 4V TO 12V Figure 8. Precision Boosted Output Regulator Q1 will be turned on to regulate current as needed. R1 is required to bias the base of Q1 and must be large enough to comply with the supply current requirements of the ADR370. The supply voltage can be as low as 4 V. The maximum current output of this circuit is limited by the power dissipation of the bipolar transistor, Q1. PV I DISS DD L =− ()× 2 048 . (7) Using the 2N3906 PNP transistor shown in Figure 8 and a 4 V power supply, RL should be chosen so that a maximum of 100 mA is drawn from the circuit, which limits the power dissipation of Q1 to ~200 mW. |
Nº de peça semelhante - ADR370 |
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Descrição semelhante - ADR370 |
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