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TS12001ITD1022T bảng dữ liệu(PDF) 7 Page - Silicon Laboratories

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TS12001
TS12001 Rev. 1.0
Page 7
BLOCK DIAGRAM
THEORY OF OPERATION
The TS12001 combines a 0.58V ±4.5% reference
and
an
analog
comparator
with
a
resettable
comparator latch in a single package. The TS12001
operates from a single 0.65V to 2.5V power supply
and consumes less than 1µA total supply current.
The TS12001 comparator has a push-pull and open-
drain output driver. The push-pull output driver is
powered from a separate supply voltage, OVDD. The
open-drain output stage allows for easy output
voltage level translation as may be required when
driving systems powered with a different power
supply rail. The analog comparator exhibits ±10mV of
internal hysteresis for clean, chatter-free output
switching. The internal reference was designed to
sink or source up to 0.1µA load currents.
The TS12001 has a preset UVLO threshold voltage
of 0.78V (typ) or can be set to other threshold
voltages with two external resistors where the divided
voltage is applied to the SET pin. When the SET pin
voltage is grounded or it is less than approximately
90mV, the internal preset UVLO threshold circuit will
control the comparator outputs. If the SET pin is
above approximately 90mV, the external voltage
divider circuit will control the comparator outputs. The
0.58V reference voltage is tied to the inverting input
of the comparator and the output of a switch is
connected
to
the
non-inverting
input
of
the
comparator. The output of the switch is either the
SET voltage or the internal UVLO threshold voltage,
depending on whether the SET pin voltage is above
or below approximately 90mV. If the switch output is
above 0.58V, the push-pull output (COUTPP) will be
HIGH and the open-drain output (COUTOD) will be
LOW and vice versa. For proper operation, the
supply voltage VIN must be applied before the output
driver supply voltage (OVDD) is applied.
The TS12001 has a latch enable pin (LHDET) that


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