A
35 Watt CD Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
1
eco# 041007-1
Description
The CALEX 12S5.7000CD is a single output DC/DC converter
with an input range of 4 to 18 VDC and a 5 VDC output. The
output current is rated at 7 amps continuous over the input
voltage range of 8 to 18 VDC, and derates linearly to 4 amps
at 4 volts input (See figure 1).
The unit can withstand a Transient Input Voltage above
18V under limited conditions.
The full 7 amps of output is available on an intermittent use
basis over the 4-8 volt input range. The ON time is limited to
12S5.7000CD Block Diagram
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Features
Automotive Application
4 to 18 Volt Input Range
5 Volt, 35 Watt Output
Isolated, Low I/O Capacitance
Five Year Warranty
30 seconds once every 10 minutes, which is a 5% duty cycle.
Also see the applications information section of this drawing.
The 12S5.7000CD is functionally similar to the 24S5.7XT,
having the same pinout and pin functions, but requires a low
source impedance.
The unit is filled with a compound and will withstand a
normal water wash after being soldered to a PC board.
A
35 Watt CD Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
2
eco# 041007-1
APPLYING THE INPUT
The 12S5.7000CD requires a low impedance source to supply
power to the input pins. The impedance must be less than 15
milliohms from DC to about 250 kHz. The unit may be
damaged without the low impedance source. This can be
achieved by an external input filter circuit (See figure 2). The
components must be mounted near the 12S5.7000CD
converter input pins, within 2 to 3 inches is satisfactory.
A typical application requires the following parts as a minimum:
C1, C2, and C3.
Capacitors C1, C2, and C3 are rated to handle the total
maximum input reflected ripple current. They can be reduced
for lower output power applications. The following table shows
the total input reflected ripple current at full load for several
input voltages which defines the requirements for C1, C2, and
C3.
Vin (VDC)
8
12
18
I-RMS
8.1
7.2
6.2
Reverse input voltage protection is provided by an internal
shunt diode across the input pins and an external fuse. The
diode will blow the fuse when the input is reversed. The diode
is rated for a 100 Amp 8 millisecond non-repetitive peak surge
current.
The wires or PC board traces to the input pins should be
sized to handle the high input currents, which will be about 6
amps at 8 volts input, and will increase to about 14 amps at 4
volts input.
NOTES
(1)
All parameters measured at Tc=25C, Vin=12VDC, and
maximum rated load unless otherwise noted. A 15 milliohm
source impedance must be connected to the input pins for
proper operation (See the applications section of this spec
drawing). The 12S5.7000CD may be damaged without a low
impedance source. The Sense pins are connected to their
respective output pins. No connection to theTrimpin. Refer to
CALEX Application Notes for definition of terms, measurement
circuits, and other information.
(2)
See CALEX Application Notes to determine the correct fuse. A
fuse must be used for reverse voltage protection of the input.
(3)
The case is connected to the -Input.
(4)
The remote sense pins must be connected to their respective
output pins for proper output voltage and regulation. The drop on
the remote sense pins must be less than 0.2 Volts for both sense
lines combined.
(5)
Transient response is defined as the time required for the output
voltage to settle from a 50% to 75% step change, of FL, to a 2%
error band (rise time of step = 2 Sec).
(6)
Dynamic response is defined as the peak voltage overshoot
during a transient as defined in note 5 above.
(7)
Noise is measured per CALEX Application Notes. Peak to Peak
measurement bandwidth is 0 - 20 MHz. RMS measurement
bandwidth is 0.01 - 1 MHz. Output noise is measured with a
10F tantalum capacitor and a 0.01F ceramic capacitor located
1 inch away from the converter. Input Reflected Ripple is
measured with the external filter C1, C2, C3, and L1 connected
to the input pins as shown in figure 2.
(8) The ON/OFF pin is Open Collector TTL, CMOS, and relay
compatible. The input to this pin is referenced to the -Input (pin
2).
(9)
The functional temperature range is intended to give an additional
data point for use in evaluating this DC/DC converter. At the low
functional temperature the converter will functional with no side
effects, however sustained operation at the high functional
temperature may reduce the expected operational life. The data
sheet specifications are not guaranteed over the functional
temperature range.
(10) The case thermal impedance with the installed heat sink is
specified as the case temperature rise over ambient per package
watt dissipated.
(11) The Transient Input Voltage can be applied after the unit is in the
OFF mode by pulling the ON/OFF pin low. It is limited to an
intermittent use basis with a 10% maximum duty cycle.
(12) Specifications subject to change without notice.
(13) Water Washability - Calex DC/DC converters are designed to
withstand most solder/wash processes. Careful attention should
be used when assessing the applicability in your specific
manufacturing process. Converters are not hermetically sealed.
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35 Watt CD Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
3
eco# 041007-1
LOW NOISE INPUT CIRCUIT
Adding L1 and C4 to C1, C2, and C3 will reduce the input
reflected ripple current. Increasing L1 will further lower the
input reflected ripple current. Size L1 to handle the DC input
current.
Adding the optional L2 and C5 filter will lower the input
reflected ripple current even further. Size L2 to handle the DC
input current.
C1, C2, C3:
United Chemi-Con LXF25VB222M18X20LL
2200 F, 25V, ESR=0.038 ohms,
Ripple Current 1.75A @ +105C, 3.0A @ +85C.
For higher input voltages use for
C1, C2, C3:
United Chemi-Con LXF50VB821M18X20LL
820 F, 50V, ESR=0.050 ohms,
Ripple Current 1.52A @ +105C, 2.63A @ +85C.
C4, C5:
United Chemi-Con LXF50VB180M5X11.5LL
18 F, 50V, 1.2 ohms,
129mA @ +105C, 229mA @ +85C.
L1, L2:
20 H. Rated at 12ADC.
Coilcraft DMT2-20-12
Fuse:
15Amp standard blow.
Bel Fuse 3AG15.
Blows at 120 milliseconds with 5x current.
Notes:
1.
L2 and C5 are optional. Use to further reduce reflected
ripple current.
2.
Equivalent parts can be used.
Figure 1. Ouput Derating
Figure 2. Input Filter and Fuse
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