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 Model 12S5.7000CD Input Range VDC Min Max 4 18 Output VDC Output mA 5 7000 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). 30 seconds once every 10 minutes, which is a 5% duty cycle. The unit can withstand a Transient Input Voltage above 18V under limited conditions. The unit is filled with a compound and will withstand a normal water wash after being soldered to a PC board. 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 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 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 1 3/2001 35 Watt CD Single Series DC/DC Converters Output Parameters (1) Input Parameters (1) Model Voltage Range Transient Input Voltage (11) 500 ms max 5 minute max Reflected Ripple (7) Input Current 0% Load 100% Load Efficiency Vin = 12 VDC, 100% Load Switching Frequency Maximum Input 100ms, No Damage Recommended Fuse 12SS5.7000CD Units MIN TYP MAX 4 12 18 VDC MAX MAX TYP TYP 40 24 50 10 16 4.0 VDC VDC mA P-P mA RMS mADC ADC TYP 73 % TYP 170 kHz MAX 20 VDC (2) AMPS TYP Model 12S5.7000CD Units 5 4.95 5.00 5.05 0 7 VDC MIN TYP MAX MIN MAX TYP MAX 0.02 0.1 TYP MAX TYP Vin = 4 to 18 VDC, Load=4A MAX TYP Vin = 4.5 to 8 VDC, Load=7A MAX TYP Vin = 4 to 8 VDC, Load=7A MAX Transient Response (5) TYP Dynamic Response (6) TYP Noise Peak - Peak, 0-20MHz bw (7) TYP RMS, 0.01-1MHz bw TYP TYP Temperature Coefficient MAX 0.04 0.2 0.04 0.4 0.2 2.0 0.5 5.0 700 320 Output Voltage Output Voltage Accuracy (4) Rated Load Range Load Regulation 25% - 100% Full Load VDC ADC % Line Regulation Vin = 8 to 18 VDC, Load=7A NOTES (1) All parameters measured at Tc=25°C, 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 µSec). (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 10µF tantalum capacitor and a 0.01µF 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. Short Circuit Protection Trim Range % % % % µs mV peak 40 mV P-P 10 mV RMS 65 ppm/°C 200 Output to CMN and Thermal Protection TYP 10 % 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. A 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) I-RMS 8 12 18 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. 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 2 3/2001 35 Watt CD Single Series DC/DC Converters General Specifications (1) 12S5.7000CD Isolation (3) Isolation Voltage Input to Output Input to Output Capacitance On/Off Function (8) Units MIN 700 VDC TYP 500 pF ON Logic Level or pin open MIN 4 VDC OFF Logic Level MAX 1.5 VDC Input Resistance Converter Input Current ON/OFF Pin Low Environmental Case Operating Range No Derating TYP 6 k ohms TYP 14 mA MIN MAX MIN MAX MIN MAX -40 85 -55 90 -55 100 °C TYP 3.3 °C/Watt TYP 100 °C TYP 10 oz Case Functional Range (9) Storage Range Thermal Impedence (10) Thermal Shutdown, Case Temperature General Unit Weight, w/heat sink °C °C 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. Figure 2. Input Filter and Fuse C1, C2, C3: United Chemi-Con LXF25VB222M18X20LL 2200 µF, 25V, ESR=0.038 ohms, Ripple Current 1.75A @ +105C, 3.0A @ +85C. A 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 2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: [email protected] 3 3/2001