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PDF QB210T Data sheet ( Hoja de datos )
| Número de pieza | QB210T | |
| Descripción | Normally-closed Switch | |
| Fabricantes | BitParts | |
| Logotipo |  |
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QB210T
INC. QBAR® NORMALLY-CLOSED SWITCH
DESCRIPTION
QBAR® ICs provide a 3-terminal semiconductor
switch that functions as:
• a solid-state normally-closed switch
• a non-inverting digital transistor
• a solid-state replacement for a normally-closed,
non-isolating relay.
QBAR® ICs do not require a separate power
supply lead. This makes possible:
• simplified control wiring
• replacement of normally-closed D.C. relays
with highly reliable solid-state devices
• improved fail-safe performance in the event
of lost control power, severed or shorted
control wires.
21
3
4
3 AMPERES
20 VOLTS
TO-220 package
PIN
1 INPUT
2 GND
3 OUTPUT
4 GND
QBAR SWITCH SYMBOL
OUTPUT
INPUT
GND
FUNCTIONAL SCHEMATIC
OUTPUT
INPUT
(CMOS
or TTL)
FUNCTION TABLE
INPUT
HI
LO
OPEN
SWITCH STATE
(OUTPUT-TO-GND)
OFF
ON
ON
TYPICAL APPLICATIONS
ALARM SWITCH
+20V
+5V
REGULATOR
Warning
indicator,
cooling fan,
brake
actuator
LOGIC
Status
Normally
HI
www.DataSheet4U.com
A QBAR switch activates an alarm over a
large range of system failure conditions:
• system failure indicated by a LO on the
status output
• status conductor cut
• status conductor shorted to ground
• loss of +5V supply
Any of these conditions will cause the QBAR
switch to turn ON and power the alarm.
PROTECTION OF FRAGILE OR
TRIGGER DEVICES
+12V
+5V
REGULATOR
Status
Inputs,
normally
high
to other
logic
Status
Normally
HI
I
A QBAR switch protects the load from being
driven by false signals when all status indi-
cators are not OK. Damage to fragile loads
such as laser diodes, or erroneous firing of
detonators can be avoided with a QBAR
switch. It shunts drive current I around the
load when any Status Gate input goes LO,
when +5V power is lost, or when the conduc-
tor from the Status Gate output to the QBAR
switch input is cut or shorted to ground.
POWER SUPPLY
EFFICIENCY BOOST
DC
Power
Supply
(up to 20V)
+
Cout
Vout
Bleeder
Resistor
Logic
Increase your power supply
efficiency by using a QBAR
switch to lower the parasitic
current drain through the
bleeder resistor during nor-
mal supply operation.
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet QB210T.PDF ] | |
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