LT1990-10
16
Rev 0
For more information www.analog.com
ANALOG DEVICES, INC. 2018
D17017-0-6/18(0)
www.analog.com
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TYPICAL APPLICATIONS
PART NUMBER DESCRIPTION COMMENTS
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Telecom Supply Current Monitor
Bidirectional Controlled Current Source
Boosted Bidirectional Controlled Current Source
–
+
LT6650
GND
IN OUT
FB
174k
20k
1nF
1µF
V
REF
= 4V
LOAD
R
S
48V
I
L
+
–
5V
V
OUT
199010 TA02
–77V ≤ V
CM
≤ 8V
V
OUT
= V
REF
– (10 • I
L
• R
S
)
LT1990-10
REF
–
+
+V
–V
LT1990-10
I
LOAD
I
LOAD
=
10 • V
CTL
/R
SENSE
≤ 100mA
EXAMPLE: FOR R
SENSE
=100,
OUTPUT IS 1mA PER 10mV INPUT
V
CTL
R
SENSE
199010 TA03
10µF
1k
1k
REF
CZT751
CZT651
+
–
+
+V
–V
LT1990-10
I
LOAD
I
LOAD
=
10 • V
CTL
/R
SENSE
≤ 3mA
EXAMPLE: FOR R
SENSE
=1k,
OUTPUT IS 1mA PER 100mV INPUT
V
CTL
R
SENSE
199010 TA04
REF
