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CS8127 Folha de dados(PDF) 4 Page - Cherry Semiconductor Corporation

Nome de Peças CS8127
Descrição Electrónicos  5V Linear Controller/Driver
Download  6 Pages
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Fabricante Electrônico  CHERRY [Cherry Semiconductor Corporation]
Página de início  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS8127 Folha de dados(HTML) 4 Page - Cherry Semiconductor Corporation

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The CS8127
function is very precise, has hysteresis
on both the
and Delay comparators, a latching
Delay capacitor discharge circuit, and operation down to
1V.
The reset circuit output is an open collector type with ON
and OFF parameters as specified. The reset output NPN
transistor is controlled by the Low Voltage Inhibit and
Reset Delay circuits (see Block Diagram).
This circuit monitors output voltage, and when output
voltage is below VRTL, causes the reset output transistor to
be in the ON (saturation) state. When the output voltage is
above VRTH, this circuit permits the reset output transistor
to go into the OFF state if allowed by the reset Delay cir-
cuit.
This circuit provides a programmable (by external capaci-
tor) delay on the
output lead. The Delay lead pro-
vides source current to the external delay capacitor only
when the Low Voltage Inhibit circuit indicates that output
voltage is above VRTH. Otherwise, the Delay lead sinks
current to ground (used to discharge the Delay capacitor).
The discharge current is latched ON when the output volt-
age falls below VRTL. The Delay capacitor is fully dis-
charged anytime the output voltage falls out of regulation,
even for a short period of time. This feature ensures a con-
trolled
pulse is generated following the detection
of an error condition. The circuit allows the
out-
put transistor to go to the OFF (open) state only when the
voltage on the Delay lead is higher than VDTC.
RESET
RESET
RESET
RESET Delay Circuit
Low Voltage Inhibit Circuit
RESET
RESET
4
RESET
VRH
VOUT
VRTH
VRTL
VRL
Delay
VDTC
VDTD
VDH
TD
VDIS
(3)
(1)
(2)
(2)
RESET Circuit Waveform
RESET Circuit Functional Description
(1) = No Delay Capacitor
(2) = With Delay Capacitor
(3) = Max: RESET Voltage (1.0V)


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