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LTC1041_15

Description
BANG-BANG Controller
File Size176KB,8 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTC1041_15 Overview

BANG-BANG Controller

LTC1041
BANG-BANG Controller
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
Micropower 1.5µW (1 Sample/Second)
Wide Supply Range 2.8V to 16V
High Accuracy
Guaranteed
SET POINT Error
±0.5mV
Max
Guaranteed
Deadband
±0.1%
of Value Max
Wide Input Voltage Range V
+
to Ground
TTL Outputs with 5V Supply
Two
Independent
Ground-Referred Control Inputs
Small Size 8-Pin SO
APPLICATIO S
s
s
s
s
The LTC
®
1041 is a monolithic CMOS BANG-BANG
controller manufactured using Linear Technology’s
enhanced LTCMOS™ silicon gate process. BANG-BANG
loops are characterized by turning the control element
fully ON or fully OFF to regulate the average value of
the parameter to be controlled. The SET POINT input
determines the average control value and the DELTA input
sets the deadband. The deadband is always 2 x DELTA and
is centered around the SET POINT. Independent control
of the SET POINT and deadband, with no interaction, is
made possible by the unique sampling input structure of
the LTC1041.
An external RC connected to the OSC pin sets the sampling
rate. At the start of each sample, internal power to the
analog section is switched on for
80µs. During this time,
the analog inputs are sampled and compared. After the
comparison is complete, power is switched off. This
achieves extremely low average power consumption
at low sampling rates. CMOS logic holds the output
continuously while consuming virtually no power.
To keep system power at an absolute minimum, a switched
power output (V
P-P
) is provided. External loads, such as
bridge networks and resistive dividers, can be driven by
this switched output.
The output logic sense (i.e., ON = V
+
) can be reversed
(i.e., ON = GND) by interchanging the V
IN
and SET POINT
inputs. This has no other effect on the operation of
the LTC1041.
Temperature Control (Thermostats)
Motor Speed Control
Battery Charger
Any ON-OFF Control Loop
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
26V AC 2-WIRE THERMOSTAT
56Ω
0.1µF
4.32k
4.99k
Supply Current vs Sampling Frequency
10000
1000
1
2
8
7
LTC1041
6
5
1µF
DELTA = 0.5°F
10M
I
S
400nA
Ultralow Power 50°F to 100°F (2.4µW) Thermostat
V
S
= 6V
SUPPLY CURRENT, I
S
(µA)
100
10
1
0.1
5k
2N6660
1N4002
(4)
49.9Ω
3
4
6.81k
+
6V
LTC1041 • TA01
ALL RESISTORS 1%.
YELLOW SPRINGS INSTRUMENT CO., INC. P/N 44007.
DRIVING THERMISTOR WITH V
P-P
ELIMINATES 3.8°F ERROR DUE TO SELF-HEATING
0.01
0.1
1
10
100
1000
SAMPLING FREQUENCY, f
S
(Hz)
10000
LTC1041 • TA02
U
TOTAL SUPPLY
CURRENT
LTC1041 SUPPLY
CURRENT
1041fa
U
U
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