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LT1970 Datasheet

  • LT1970

  • 500mA Power Op Amp with Adjustable Precision Current Limit

  • 234.86KB

  • 12頁

  • LINER

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LT1970
500mA Power Op Amp with
Adjustable Precision Current Limit
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
鹵500mA
Minimum Output Current
Independent Adjustment of Source and
Sink Current Limits
2% Current Limit Accuracy
Operates with Single or Split Supplies
Shutdown/Enable Control Input
Open Collector Status Flags:
Sink Current Limit
Source Current Limit
Thermal Shutdown
Fail Safe Current Limit and Thermal Shutdown
1.6V/碌s Slew Rate
3.6MHz Gain Bandwidth Product
Fast Current Limit Response: 2MHz Bandwidth
Specified Temperature Range: 鈥?40擄C to 85擄C
The LT
廬
1970 is a
鹵500mA
power op amp with precise
externally controlled current limiting. Separate control
voltages program the sourcing and sinking current limit
sense thresholds with 2% accuracy. Output current may
be boosted by adding external power transistors.
The circuit operates with single or split power supplies from
5V to 36V total supply voltage. In normal operation, the
input stage supplies and the output stage supplies are con-
nected (V
CC
to V
+
and V
EE
to V
鈥?/div>
). To reduce power dissi-
pation it is possible to power the output stage (V
+
, V
鈥?/div>
) from
independent, lower voltage rails. The amplifier is unity-gain
stable with a 3.6MHz gain bandwidth product and slews at
1.6V/碌s. The current limit circuits operate with a 2MHz re-
sponse between the VC
SRC
or VC
SNK
control inputs and
the amplifier output.
Open collector status flags signal current limit circuit
activation, as well as thermal shutdown of the amplifier. An
enable logic input puts the amplifier into a low power, high
impedance output state when pulled low. Thermal shut-
down and a
鹵800mA
fixed current limit protect the chip
under fault conditions.
The LT1970 is packaged in a 20-lead TSSOP package with
a thermally conductive copper bottom plate to facilitate
heat sinking.
APPLICATIO S
s
s
s
s
Automatic Test Equipment
Laboratory Power Supplies
Motor Drivers
Thermoelectric Cooler Driver
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V
LIMIT
0V TO 5V
I
OUT(LIMIT)
=
鹵
V
LIMIT
10 鈥?R
CS
A
V
= 2 Amplifier with Adjustable
鹵500mA
Full-Scale
Current Limit and Fault indication
15V
15V
3k
V
+
VC
SRC
+IN
VC
SNK
ISNK
ISRC
TSD
OUT
LT1970
SENSE
+
SENSE
鈥?/div>
V
鈥?/div>
鈥揑N
V
EE
COMMON
V
CC
Current Limited Sinewave Into 10鈩?Load
4V
V
LOAD
I
OUT
R
CS
1鈩?/div>
1/4W
2V
0V
鈥?2V
V
IN
R1
10k
R2
10k
1970 TA01
LOAD
鈥?5V
VC
SRC
= 4V
VC
SNK
= 2V
R
CS
= 1鈩?/div>
U
20碌s/DIV
1970 TA02
U
U
1970f
1

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