35 Watt CD Single Series DC/DC Converters
Features
! Automotive Application
! 4 to 18 Volt Input Range
! 5 Volt, 35 Watt Output
! Isolated, Low I/O Capacitance
! Five Year Warranty
Selection Chart
Input Range
VDC Output Output
Model
VDC mA
Min Max
12S5.7000CD 4 18 5 7000
Description
The CALEX 12S5.7000CD is a single output DC/DC converter 30 seconds once every 10 minutes, which is a 5% duty cycle.
with an input range of 4 to 18 VDC and a 5 VDC output. The Also see the applications information section of this drawing.
output current is rated at 7 amps continuous over the input The 12S5.7000CD is functionally similar to the 24S5.7XT,
voltage range of 8 to 18 VDC, and derates linearly to 4 amps having the same pinout and pin functions, but requires a low
at 4 volts input (See figure 1). source impedance.
The unit can withstand a Transient Input Voltage above The unit is filled with a compound and will withstand a
18V under limited conditions. normal water wash after being soldered to a PC board.
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
A
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
1 3/2001
35 Watt CD Single Series DC/DC Converters
Input Parameters (1) Output Parameters (1)
Model 12SS5.7000CD Units Model 12S5.7000CD Units
MIN 4 Output Voltage 5 VDC
Voltage Range TYP 12 VDC MIN 4.95
MAX 18 Output Voltage
TYP 5.00 VDC
Transient Input Voltage (11) Accuracy (4)
MAX 5.05
500 ms max MAX 40 VDC MIN 0
5 minute max MAX 24 VDC Rated Load Range ADC
MAX 7
Reflected Ripple (7) 50 mA P-P
TYP Load Regulation TYP 0.02
10 mA RMS %
25% - 100% Full Load MAX 0.1
Input Current 0% Load TYP 16 mADC
100% Load TYP 4.0 ADC Line Regulation
Efficiency TYP 0.04
TYP 73 % Vin = 8 to 18 VDC, Load=7A %
Vin = 12 VDC, 100% Load MAX 0.2
Switching Frequency TYP 170 kHz TYP 0.04
Vin = 4 to 18 VDC, Load=4A %
Maximum Input MAX 0.4
MAX 20 VDC
100ms, No Damage TYP 0.2
Vin = 4.5 to 8 VDC, Load=7A %
Recommended Fuse (2) AMPS MAX 2.0
TYP 0.5
Vin = 4 to 8 VDC, Load=7A %
MAX 5.0
NOTES Transient Response (5) TYP 700 µs
(1) All parameters measured at Tc=25°C, Vin=12VDC, and Dynamic Response (6) TYP 320 mV peak
maximum rated load unless otherwise noted. A 15 milliohm Noise
source impedance must be connected to the input pins for Peak - Peak, 0-20MHz bw (7) TYP 40 mV P-P
proper operation (See the applications section of this spec RMS, 0.01-1MHz bw TYP 10 mV RMS
drawing). The 12S5.7000CD may be damaged without a low TYP 65
impedance source. The Sense pins are connected to their Temperature Coefficient ppm/°C
MAX 200
respective output pins. No connection to theTrimpin. Refer to Output to CMN and
CALEX Application Notes for definition of terms, measurement Short Circuit Protection
Thermal Protection
circuits, and other information.
Trim Range TYP 10 %
(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 APPLYING THE INPUT
the remote sense pins must be less than 0.2 Volts for both sense
lines combined. The 12S5.7000CD requires a low impedance source to supply
(5) Transient response is defined as the time required for the output power to the input pins. The impedance must be less than 15
voltage to settle from a 50% to 75% step change, of FL, to a 2% milliohms from DC to about 250 kHz. The unit may be
error band (rise time of step = 2 µSec).
damaged without the low impedance source. This can be
(6) Dynamic response is defined as the peak voltage overshoot achieved by an external input filter circuit (See figure 2). The
during a transient as defined in note 5 above.
components must be mounted near the 12S5.7000CD
(7) Noise is measured per CALEX Application Notes. Peak to Peak
measurement bandwidth is 0 - 20 MHz. RMS measurement converter input pins, within 2 to 3 inches is satisfactory.
bandwidth is 0.01 - 1 MHz. Output noise is measured with a A typical application requires the following parts as a minimum:
10µF tantalum capacitor and a 0.01µF ceramic capacitor located
C1, C2, and C3.
1 inch away from the converter. Input Reflected Ripple is
measured with the external filter C1, C2, C3, and L1 connected A
Capacitors C1, C2, and C3 are rated to handle the total
to the input pins as shown in figure 2. maximum input reflected ripple current. They can be reduced
(8) The ON/OFF pin is Open Collector TTL, CMOS, and relay for lower output power applications. The following table shows
compatible. The input to this pin is referenced to the -Input (pin
the total input reflected ripple current at full load for several
2).
input voltages which defines the requirements for C1, C2, and
(9) The functional temperature range is intended to give an additional
data point for use in evaluating this DC/DC converter. At the low C3.
functional temperature the converter will functional with no side Vin (VDC) 8 12 18
effects, however sustained operation at the high functional
temperature may reduce the expected operational life. The data I-RMS 8.1 7.2 6.2
sheet specifications are not guaranteed over the functional
temperature range.
Reverse input voltage protection is provided by an internal
shunt diode across the input pins and an external fuse. The
(10) The case thermal impedance with the installed heat sink is
specified as the case temperature rise over ambient per package diode will blow the fuse when the input is reversed. The diode
watt dissipated. is rated for a 100 Amp 8 millisecond non-repetitive peak surge
(11) The Transient Input Voltage can be applied after the unit is in the current.
OFF mode by pulling the ON/OFF pin low. It is limited to an
intermittent use basis with a 10% maximum duty cycle.
The wires or PC board traces to the input pins should be
sized to handle the high input currents, which will be about 6
(12) Specifications subject to change without notice.
amps at 8 volts input, and will increase to about 14 amps at 4
volts input.
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
2 3/2001
35 Watt CD Single Series DC/DC Converters
General Specifications (1)
12S5.7000CD Units
Isolation (3)
Isolation Voltage
MIN 700 VDC
Input to Output
Input to Output
TYP 500 pF
Capacitance
On/Off Function (8)
ON Logic Level or pin open MIN 4 VDC
OFF Logic Level MAX 1.5 VDC
Input Resistance TYP 6 k ohms
Converter Input Current
TYP 14 mA
ON/OFF Pin Low
Environmental
Case Operating Range MIN -40
°C
No Derating MAX 85
MIN -55
Case Functional Range (9) °C
MAX 90
MIN -55
Storage Range °C
MAX 100
Thermal Impedence (10) TYP 3.3 °C/Watt
Thermal Shutdown,
TYP 100 °C
Case Temperature
General
Unit Weight, w/heat sink TYP 10 oz
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 Figure 2. Input Filter and Fuse
input current.
C1, C2, C3: United Chemi-Con LXF25VB222M18X20LL
A
2200 µF, 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 µF, 50V, ESR=0.050 ohms,
Ripple Current 1.52A @ +105C, 2.63A @ +85C.
C4, C5: United Chemi-Con LXF50VB180M5X11.5LL
18 µF, 50V, 1.2 ohms,
129mA @ +105C, 229mA @ +85C.
L1, L2: 20 µH. 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
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
3 3/2001