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PDF FAN3240 Data sheet ( Hoja de datos )
| Número de pieza | FAN3240 | |
| Descripción | Smart Dual-Coil Relay Drivers | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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May 2014
FAN3240 / FAN3241
Smart Dual-Coil Relay Drivers
Features
8-V to 60-V Operation Range for use with 12-V,
24-V or 48-V Relays
Strong DC Current to Break through Welded
Contacts without using External Switches
Integrated Linear Regulator for Isolated or
Non-Isolated Meter Power Designs
Accurate Input Filter Time and XOR input protection
Accurate maximum output pulse width
Two output operating modes – follows input width
or maximum value
3.3-V or 5-V Square-Wave Logic Input Signals
Enable Pin for Operational Flexibility
Internal Thermal Shutdown Protection
Rated from –40°C to +105°C Ambient
Applications
Smart E-Meters, Energy Generation & Distribution,
Building and Home Control, Industrial dual-coil
relay Driving Applications
Description
The FAN324x family includes dual high-current relay
drivers designed to drive dual-coil polarized latching
relays that connect and disconnect power in smart
electronic meters and solar inverter applications.
The output of the FAN324x is rated for operation with
supply voltage range from 8 V to 60 V. The filter / timer
block prevents inadvertent switching from noisy input
signals by providing input-pulse qualification (tQUAL) and
maximum output pulse width limit (tMAX). The output can
operate in follow-input mode or maximum width mode.
These parameters are factory adjustable and additional
configurations are available. XOR input protection is
also provided so that both outputs are prevented from
being on at the same time. Under-Voltage Lockout
(UVLO) function disables the outputs until the supply
voltage is within the operating range.
The FAN324x has two separate driver channels with
non-inverting logic. One enable / disable pin allows
shutdown of both channels, independent of the input
signals. Internal thermal shutdown function is provided
for thermal protection. The FAN324x is available in an
Lead (Pb)-Free 8-lead SOIC package.
+SUPPLY
EN 1
Ref
UVLO
VS 10 V ~ 60.0 V
8
5VB
2
Internal
Bias
Regulator
TSD
OUT1
EN 7
Relay Open
3
IN1
Processor
100 kΩ
IN2
4
Relay Close
100 kΩ
GND
Osc 6
Timer /
Filter /
OUT2
Protection EN 5
Product
FAN3240
FAN3241
© 2012 Fairchild Semiconductor Corporation
FAN3240 / FAN3241 • Rev. 1.0.2
Figure 1. Typical Application Diagram
A
B
C
tQUAL
15 ms
1 ms
tMAX
150 ms
30 ms
OUT Mode
tOUT = tIN
tOUT = tMAX
www.fairchildsemi.com
1 page  
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
Parameter
VS
V5VB
VEN
VIN
VOUT
TL
TJ
TSTG
VS to GND
5VB to GND
EN to GND
IN1 and IN2 to GND
OUT1 and OUT2 to GND
Lead Soldering Temperature (10 Seconds)
Junction Temperature
Storage Temperature
Min.
-0.3
-0.3
GND - 0.3
GND - 0.3
GND - 0.3
-55
-65
Max.
70.0
6.0
6.0
6.0
VS + 0.3
+260
+125
+150
Unit
V
V
V
V
V
ºC
ºC
ºC
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
VS
VEN
VIN
CVS
C5VB
TA
Output Supply Voltage Range
Enable Voltage EN
Input Voltage IN1, IN2
Bypass Capacitor at VS Pin
Bypass Capacitor at 5VB Pin
Operating Ambient Temperature
Min.
8
0
0
100
-40
Typ.
3.3 to 5.0
3.3 to 5.0
1
220
Max.
60
5.5
5.5
+105
Unit
V
V
V
µF
nF
ºC
© 2011 Fairchild Semiconductor Corporation
FAN3240 • Rev. 1.0.2
5
www.fairchildsemi.com
5 Page 
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:
5μs/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.
3.3V or VS
EN
pin
1 Filter
1.4V/1.3V
Internal
Enable
Signal
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).
© 2011 Fairchild Semiconductor Corporation
FAN3240 • Rev. 1.0.2
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet FAN3240.PDF ] | |
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