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LT6700HVHS6-1-TRMPBF Datasheet(PDF) 17 Page - Linear Technology

Part # LT6700HVHS6-1-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

LT6700HVHS6-1-TRMPBF Datasheet(HTML) 17 Page - Linear Technology

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LT6700-1/LT6700-2/LT6700-3/
LT6700HV-1/LT6700HV-2/
LT6700HV-3
17
6700123ff
Figure 3. Isolated PWM or Δ∑ 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
+
Instrumentation Grade Pulse Width Modulator (PWM)
Comparators with hysteresis are frequently employed
to make simple oscillator structures, and the LT6700/
LT6700HV lends itself nicely to forming a charge-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
2V reference supply level for the CMOS NOT gate (inverter),
which serves as the precision switch element for the charge
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
PWM information drives the LED of an optocoupler, allow-
ing the VIN information to be coupled across a dielectric
barrier. As an additional option to the circuit, the feedback
loop can be broken and a second optocoupler employed to
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
formed if desired. Approximately 11-bit accuracy and noise
performance was observed in a one second integration
period for duty factors from 1% to 99%.
APPLICATIONS INFORMATION


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