Datasheet AD581 (Analog Devices) - 8

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AD581 PRECISION HIGH CURRENT SUPPLY CONNECTION FOR REDUCED PRIMARY SUPPLY
The AD581 can be easily connected with power pnp or power Whereas line regulation is specified down to 13 V, the typical Darlington pnp devices to provide much greater output current AD581 works as specified ≤12 V. The current sink capability capability. The circuit shown in Figure 10 delivers a precision allows even lower supply voltage capability such as operation 10 V output with up to 4 A supplied to the load. The 0.1 μF from 12 V ±5% as shown in Figure 11. The 560 Ω resistor reduces capacitor is required only if the load has a significant capacitive the current supplied by the AD581 to a manageable level at a component. If the load is purely resistive, improved high frequency full 5 mA load. Note that the other band gap references, without supply rejection results from removing the capacitor. current sink capability, may be damaged by use in this circuit
VIN ≥ 15V
configuration.
12V ±5% 470Ω +VS 560Ω 5% AD581 10V @ 0mA TO 5mA VOUT
1 01
GND
4-
2N6040
01 08 Figure 11. 12 V Supply Connection
0.1µF +VS VOUT V AD581 OUT 10V @ 4A
0 -01
GND
14 80 0 Figure 10. High Current Precision Supply Rev. C | Page 8 of 12 Document Outline FEATURES FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION APPLYING THE AD581 VOLTAGE VARIATION vs. TEMPERATURE OUTPUT CURRENT CHARACTERISTICS DYNAMIC PERFORMANCE PRECISION HIGH CURRENT SUPPLY CONNECTION FOR REDUCED PRIMARY SUPPLY THE AD581 AS A CURRENT LIMITER NEGATIVE 10 V REFERENCE 10 V REFERENCE WITH MULTIPLYING CMOS DACs OR ADCs PRECISION 12-BIT DAC REFERENCE OUTLINE DIMENSIONS ORDERING GUIDE