TI-AMC22C12.pdf
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AMC22C12 Fast Response, Basic Isolated Window Comparator
With Adjustable Threshold and Latch Function
1 Features
• Wide high-side supply range: 3 V to 27 V
• Low-side supply range: 2.7 V to 5.5 V
• Adjustable threshold:
– Window-comparator mode: ±20 mV to ±300 mV
– Positive-comparator mode: 600 mV to 2.7 V
• Reference for threshold adjustment: 100 μA, ±2%
• Trip threshold error: ±1% (max) at 250 mV
• Open-drain output with optional latch mode
• Propagation delay: 290 ns (typ)
• High CMTI: 55 kV/μs (min)
• Safety-related certifications:
– 4250-V
PK
basic isolation per DIN EN IEC
60747-17 (VDE 0884-17)
– 3000-V
RMS
isolation for 1 minute per UL1577
• Fully specified over the extended industrial
temperature range: –40°C to +125°C
2 Applications
• Overcurrent or overvoltage detection in:
– Motor drives
– Frequency inverters
– Solar inverters
– DC/DC converters
3 Description
The AMC22C12 is an isolated window comparator
with a short response time. The open-drain
output is separated from the input circuitry by an
isolation barrier that is highly resistant to magnetic
interference. This barrier is certified to provide
galvanic isolation of up to 3 kV
RMS
according to DIN
EN IEC 60747-17 (VDE 0884-17) and UL1577, and
supports a working voltage of up to 560 V
RMS
.
The comparison window is centered around 0 V,
meaning that the comparator trips if the absolute
value of the input voltage exceeds the trip threshold
value. The trip threshold is adjustable from 20 mV
to 300 mV through a single external resistor and,
therefore, the comparison window ranges from
±20 mV to ±300 mV. When the voltage on the REF
pin is greater than 550 mV, the negative comparator
is disabled and only the positive comparator is
functional. The reference voltage in this mode can be
as high as 2.7 V. This mode is particularly useful for
monitoring voltage supplies.
The open-drain output on the device supports
transparent mode (LATCH input tied to GND2) where
the output follows the input state, or latch mode,
where the output is cleared on the falling edge of the
latch input signal.
The AMC22C12 is available in a 8-pin SOIC
package and is specified over the extended industrial
temperature range of –40°C to +125°C.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
AMC22C12 SOIC (8) 4.9 mm × 3.9 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Low-side supply
(2.7..5.5 V)
AMC22C12
Galvanic Isolation Barrier
GND1
IN
REF
VDD1
RSHUNT
I
High-side supply
(3..27 V)
LDO
GND2
OUT
LATCH
VDD2
from MCU
to MCU
100
A
–
+
Typical Application
ADVANCE INFORMATION
AMC22C12
SBASAJ8 – JUNE 2022
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change
without notice.
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