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LT6700HVHS6-3-TRMPBF Datasheet(PDF) 16 Page - Linear Technology

Part # LT6700HVHS6-3-TRMPBF
Description  Micropower, Low Voltage, Dual Comparator with 400mV Reference
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT6700HVHS6-3-TRMPBF Datasheet(HTML) 16 Page - Linear Technology

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LT6700/LT6700HV

6700123fg
applicaTions inForMaTion
Figure 3. Isolated PWM or ∆∑ Converter
LT6700-1
VS
10k
GND
+INA
–INB OUTB
OUTA
100k*
100k*
0.22µF††
+
412k*
10k**
470Ω
Lithium
COIN CELL
10k
10k
750Ω
10k
750**
3V/5V
3V/5V
ΔΣ
SAMPLE
IN
MOC-207
MOC-207**
PWM OUT
(OR ΔΣ SENSE)
2
1
5
6
5
6
2
1
0.1µF
0.1µF
3V NOM (IS < 3mA)
5 • VREF = 2V
6700123 F03
22µF
1% METAL FILM
DELETE FOR PWM MODE
CONNECT FOR PWM MODE
OPTIMIZED FOR 2kHz ΔΣ SAMPLING, fPWM(MAX) ≈ 0.6kHz
*
**
††
309k*
NC7S14
309k*
VIN
0V TO 2V
+
Figure 2. Micropower Thermostat/Temperature Alarm
LT6700-1
VS
10k
GND
+INA
–INB OUTB
OUTA
499k
RTH
T
RTH = 1M (e.g., YSI 44015, 1.00MΩ AT 25°C)
RSET = RTH AT TSET
*RESISTANCE MAY REQUIRE OPTIMIZATION FOR OPERATION
OVER INTENDED RTH AND VSUPPLY RANGES
HYSTERESIS ZONE ≈0.4°C
RSET
2 • VREF
499k
220k
220k*
3.3µF
3.3µF
1.4V TO 18V
(IS ≈ 10µA)
0.1µF
T < TSET
6700123 F02
charges and discharges in a shallow, controlled fashion.
The multiplied reference signal also contains ripple that is
the hysteresis multiplied by the same factor, so additional
filtering is performed at the sense node of the bridge to
prevent comparator chatter in the section A comparator,
which is performing the actual conditional decision for
the circuit.
Instrumentation Grade Pulse Width Modulator (PWM)
Comparators with hysteresis are frequently employed
to make simple oscillator structures, and the LT6700/
LT6700HVlendsitselfnicelytoformingacharge-balancing
PWM function. The circuit shown in Figure 3 forms a PWM
that is intended to transmit an isolated representation of a
voltage difference, rather like an isolated instrumentation
amplifier. The section B comparator is used to generate a
2VreferencesupplylevelfortheCMOSNOTgate(inverter),
whichservesastheprecisionswitchelementforthecharge
balancer. The heart of the charge balancer is the section A
comparator, which is detecting slight charge or discharge
states on the 0.22µF “integration” capacitor as it remains
balanced at ≈400mV by feedback through the NOT gate.
The input sense voltage, VIN, is converted to an imbal-
ance current that the NOT gate duty cycle is continually
correcting for, thus the digital waveform at the section A
comparator output is a PWM representation of VIN with
respect to the 2V “full scale.” In this particular circuit, the
PWMinformationdrivestheLEDofanopto-coupler,allow-
ing the VIN information to be coupled across a dielectric
barrier. As an additional option to the circuit, the feedback
loopcanbebrokenandasecondopto-coupleremployedto
provide the charge balance management. This configura-
tion allows for clocking the comparator output (externally
to this circuit) and providing synchronous feedback such
that a simple Δ∑ voltage-to-frequency conversion can be
formedifdesired.Approximately11-bitaccuracyandnoise
performance was observed in a one second integration
period for duty factors from 1% to 99%.


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