LM359

www.ti.com

SNOSBT4C – MAY 1999 – REVISED MARCH 2013

(1)

frequency open loop voltage gain in V/V and an ambient temperature of 25°C is assumed (KT/q = 26 mV and

(2)

which is important for DC biasing considerations.

The total device supply current (for both amplifiers) is also a direct function of the set currents and can be

approximated by:

(3)

with each set current programmed by individual resistors.

PROGRAMMING WITH A SINGLE RESISTOR

to pin 8 (Figure 30).

(4)

This configuration does not affect any of the internal set current dependent parameters differently than previously

discussed except the total supply current which is now equal to:

(5)

Care must be taken when using resistors to program the set current to prevent significantly increasing the supply

voltage above the value used to determine the set current. This would cause an increase in total supply current

due to the resulting increase in set current and the maximum device power dissipation could be exceeded. The

set resistor value(s) should be adjusted for the new supply voltage.

One method to avoid this is to use an adjustable current source which has voltage compliance to generate the

set current as shown in Figure 31.

Copyright © 1999–2013, Texas Instruments Incorporated

Submit Documentation Feedback

11

Product Folder Links: LM359