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FAN3240TMX Datenblatt(PDF) 11 Page - Fairchild Semiconductor

Teilenummer FAN3240TMX
Bauteilbeschribung  Smart Dual-Coil Relay Drivers
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN3240TMX Datenblatt(HTML) 11 Page - Fairchild Semiconductor

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© 2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN3240 • Rev. 1.0.2
11
2.
Internal Bias Regulator (5VB Pin)
The FAN324x’s internal bias generator is a low dropout
linear regulator with a 5 V output. The regulator is
designed to operate with minimum overhead; it is able
to regulate its output with very low voltage drop across
its bypass element.
The 5 V output of the regulator can be used to power
external circuitry as well. In addition to the internal
power consumption of the FAN324x, the regulator can
deliver at least 5 mA additional current for an external
load connected to the 5VB pin of the device.
Similar to other linear regulator circuits, the on-board
regulator needs to be bypassed externally for stabile
operation. It is recommended that the output of the
regulator is bypassed by at least a 100 nF, good-quality,
high-frequency, ceramic capacitor placed in close
proximity to the 5VB and GND pins.
3.
Enable Operation (EN Pin)
The enable (EN) input is a level-sensitive input and it is
the most dominant input of the FAN324x during normal
operation. The enable pin must be above the input
threshold to generate an output pulse and energize the
relay coil. The input circuit of the enable input is
comprised of a comparator circuit with a precise voltage
source
connected
to
the
inverting
input
of
the
comparator and the EN pin connected to the non-
inverting input. To avoid erroneous operation due to
potential noise superimposed on the incoming control
signal, the enable signal goes through a low-pass filter
before it connects to the non-inverting input of the
comparator. The filter is designed with a large time-
constant; thus the enable input has an approximately
5 µs delay before it can act on the received command
level. Once the EN pin is pulled LOW and the signal
propagates through the filter, the relay drive outputs
become high impedance and the internal control circuit
returns to its initial inactive state.
Time Base:
5
μs/div
Figure 19. Enable Operating Waveforms
Due to the precise thresholds, the EN input can also
be used as a voltage monitoring input that enables or
disables the relay drive based on the monitored
voltage level.
This functionality can be used to monitor other vital
voltage levels in the system, such as the supply
voltage for the logic generating the control signals for
the FAN324x or the power rail of the relay being driven
by the device. An example implementation of this
monitoring functionality is shown in Figure 20.
Internal
Enable
Signal
1.4V/1.3V
1
Filter
3.3V or VS
EN
pin
Figure 20. Voltage Monitoring Example Using the
EN Input Circuit
As Figure 20 indicates, the input comparator is
implemented
with
a
fixed
internal
hysteresis
of
approximately 100 mV. The incoming low-pass filter and
the built-in hysteresis of the comparator provide enough
noise immunity to prevent inadvertent toggling of the
internal enable signal. Additional filtering can be added
by connecting an additional high-frequency capacitor
between the EN pin and GND (pin 6).
Since
the
input
threshold
of
the
comparator
is
compatible with TTL logic signal levels, the EN input can
also be driven directly from a logic source, such as a
microcontroller or other similar digital circuits. When the
EN pin is driven by a logic signal, the resistors shown in
Figure 20 are not needed and additional filtering is not
required because of the fast rise and fall times of such
digital signals.
It is important to note that while the EN input is the most
dominant input during normal operation, the Under-
Voltage
Lockout
(UVLO)
and
Thermal
Shutdown
protection (TSD) override the enable input and can
disable the operation of the device.
4.
Input Signal Processing (IN1 and IN2 Pins)
The FAN324x features two drive channels, one to
energize the relay coil to close the relay contact(s) and
another one to open it. The channels utilize their
respective inputs (IN1 and IN2 pins) and outputs (OUT1
and OUT2 pins). Since the circuitry comprising the two
driver channels inside the FAN324x are identical in
implementation and in operation, they can be assigned
to perform either the opening or closing functions.
The voltage thresholds of the FAN324x inputs meet
industry-standard TTL-logic levels independent of the
supply voltage, VS. Therefore, the input pins can be
driven from a range of logic signal levels for which a
voltage over 2 V is considered logic HIGH (active).


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