LT1010CDD datasheet(12/20 Pages) LINER

12 / 20 page

LT1010

1010fc

excellent matching of the feedback resistors is required to

get high output resistance. Output is bidirectional.

APPLICATIO S I FOR ATIO

LT1010

100k

0.01%

100k

0.01%

100k

0.01%

100k

0.01%

Ω

0.1%

1010 AI13

IOUT

–

LT1012

R2(V2 – V1)

R1R4

IOUT =

LT1010

Ω

0.1%

VIN

10R1

IOUT =

VIN

IOUT

1010AI14

LM163

×10

This circuit uses an instrumentation amplifier to eliminate

the matched resistors. The input is not high impedance

and must be driven from a low impedance source like an

op amp. Reversal of output sense can be obtained by

grounding Pin 7 of the LM163 and driving Pin 5.

enables the current regulator to get control of the output

current from the buffer current limit within a microsecond

for an instantaneous short.

In the voltage regulation mode, A1 and A2 act as a fast

voltage follower using the capacitive load isolation tech-

nique described earlier. Load transient recovery as well as

capacitive load stability are determined by C1. Recovery

from short circuit is clean.

Bidirectional current limit can be obtained by adding

another op amp connected as a complement to A3.

Supply Splitter

Dual supply op amps and comparators can be operated

from a single supply by creating an artificial ground at half

the supply voltage. The supply splitter shown here can

source or sink 150mA.

The output capacitor, C2, can be made as large as neces-

sary to absorb current transients. An input capacitor is

also used on the buffer to avoid high frequency instability

that can be caused by high source impedance.

Output resistances of several megohms can be obtained

with both circuits. This is impressive considering the

±150mAoutputcapability.Highfrequencyoutputcharac-

teristics will depend on the bandwidth and slew rate of the

amplifiers. Both these circuits have an equivalent output

capacitance of about 30nF.

Voltage/Current Regulator

This circuit regulates the output voltage at VV until the

load current reaches a value programmed by VI. For

heavier loads, it is a precision current regulator.

With output currents below the current limit, the current

regulator is disconnected from the loop by D1 with D2

keeping its output out of saturation. This output clamp

LT1010

1N457

1nF

Ω

0.1%

1010 AI15

LT118A

10mA/V

1V/V

0.1%

OUTPUT

99.8k

0.1%

99.8k

0.1%

10pF

LT118A

LT1010

10k

1nF

0.1

µF

0.01

µF

V+/2

1010 AI16

V+

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