APPLICATION NOTES Rev C SP48S3.3-66 66W DC-DC Converter 36-75 Vdc Input 3.3 Vdc Output at 20A Half-Brick Package Features: x 80% Efficient at Full Load x Fast Transient Response x Operation to No Load x 100% Burn In x Remote ON/OFF (Active High/Low) x Remote Sense Compensation x UL 1950 Listed - CE Mark x x x x x x x Low Output Ripple Fixed Switching Frequency Output Over Current Protection Output Short Circuit Protection Over Temperature Protection 1500 Vdc Isolation Test Board Available Description: The SP & SPW series is a high-density half brick converter that incorporates the desired features required in today’s demanding applications. When performance, reliability, and low cost are needed, the SP & SPW series delivers. (888) 597-WALL www.wallindustries.com 1 of 7 Rev C APPLICATION NOTES WALL INDUSTRIES, INC. Technical Specifications SP & SPW SERIES Model No. SP48S3.3-66 All specifications are based on 25C, Nominal Line and Full Load unless otherwise noted. We reserve the right to change specifications based on technological advances. SPECIFICATION Related condition MIN INPUT Turn on at Turn off at Input Over voltage Shutdown Turn off at Turn on at Operating Voltage Range Maximum Input Current No Load Input Current Input Current under “LOGIC OFF” Inrush Current Transient Rating Reflected Ripple Current OUTPUT Output Voltage Set point Output Voltage Regulation Over Load Over Line Over Temperature Output Voltage Ripple and Noise Basic Ripple Spikes P-P Output Current Ranges Output Current Limit Short Term Output Current Surge DYNAMIC CHARACTERISTICS Input Voltage Ripple Rejection Output Transient and Load Changes Load step / delta V Load step / delta V Recovery Time Turn on Delay Overshoot of Output Voltage EFFICIENCY @ 100% load @ 75% load @ 50% load @ 25% load TEMPERATURE CONSIDERATIONS Thermal Resistance Normal Convection 100 lfm 200 lfm 300 lfm 400 lfm Heatsink Considerations General Technical Data Switching Frequency Remote ON OFF Control (See Note Below) Trimmablility Over Temperature Shutdown MTBF Rated Input Voltage Low Line 100% load 36 NOM MAX Unit Measured 34 32 Volt DC Volt DC 78 77 48 2.283 25 2 Volt DC Volt DC Volt DC A mA mA A2 Sec mA 75 20 3.267 Rated Output Current 0 24 3.300 28 3.333 Volt DC 0.1 0.1 0.02 % % % / oC 50 20 32 mV mV A A A/sec 120 Hz X X 50 to 75% 50 to 100% 75 to 50% 100 to 50 % To within 1% Rated Vo From Vin(nom) to 90% Vout (nom) Full Load Resistive Rtheta c-a dB 250 250 100 250 0 mV mV µsec M sec % 80 81 82 80 % % % % 7.5 6.2 5.1 4.3 3.5 o C/Watt C/Watt o C/Watt o C/Watt o C/Watt o Contact Factory FIXED Positive or Negative 400 Case Temperature 105 Bellcore TR-332 nom is 2.50m KHz o C Hours Note: Positive Remote ON/OFF control is standard. To order negative logic Remote ON/OFF control add the suffix "R" to the part number. (888) 597-WALL www.wallindustries.com 2 of 7 Rev C WALL INDUSTRIES, INC. APPLICATION NOTES SP & SPW SERIES Figure 1: Mechanical Dimensions Unit: inches Tolerance: X.XX ±0.020 X.XXX±0.010 (888) 597-WALL www.wallindustries.com 3 of 7 Rev C WALL INDUSTRIES, INC. APPLICATION NOTES SP & SPW SERIES Output Voltage Trim The following information is provided to allow quick calculation of the trim resistor value for a desired output voltage. The general procedure for calculating a trim resistor is as follows: 1. 2. 3. 4. Determine the desired output voltage (Vo) Select Equation. (Trim Low/Trim High) Use the data in Table 1 to complete the equation. Evaluate. In order to trim low use Equation 1 and Table 1 to calculate resistor RTL for the desired output voltage. Equation 1: Trim Low RTL ª º Vo VREF « VREF » RLIM 1 ( ) ( ( )) V V R R o REF L H ¬ ¼ Vo - Desired output voltage. All resistor values in K ohms. Schematic 1: Trim Low In order to trim high use Equation 2 and Table 1 to calculate resistor RTH for the desired output voltage. Equation 2: Trim High RTH ª « « ¬ VREF Vo VREF RH VREF RL º » R LIM » ¼ Vo - Desired output voltage. All resistor values in K ohms. Schematic 2: Trim High MODEL (Output Voltage) RH RLIM RL VREF (K OHMS) (K OHMS) (K OHMS) (VOLTS) 3.3V 5.0V 8.0V 9.0V 12.0V 15.0V 24.0V 26.0V 32.0V 0.750 2.49 5.49 6.49 9.53 12.4 21.5 17.6 23.7 0.499 10.0 10.0 10.0 13.7 13.7 15.4 15.4 12.7 2.32 2.49 2.49 2.49 2.49 2.49 2.49 1.87 2.00 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 Table 1 : Trim Low/High Data Table. Note: Output trim +/- 10% max. (888) 597-WALL www.wallindustries.com 4 of 7 Rev C APPLICATION NOTES WALL INDUSTRIES, INC. SP & SPW SERIES %RATEDOUTPUTPOWER DERATING CURVE 100 90 80 70 60 50 40 30 20 10 0 0 LFM 100 LFM 200 LFM 300 LFM 400 LFM 5 15 25 35 45 55 65 75 85 95 105 0 AMBIENT TEMPERATURE C SP 48S3.3-66 POWERDISSIPATION(Watts) POWER DISSIPATION VS OUTPUT POWER 20 18 16 14 12 10 8 6 4 2 0 36 VIN 48 VIN 75VIN 0 10 20 30 40 50 60 70 80 90 100 % OUTPUT POWER SP48S3.3-66 EFFICIENCY VS RATED OUTPUT POWER EFFICIENCY(%) 90 80 70 36V 60 48V 50 75V 40 30 10 20 30 40 50 60 70 80 90 100 RATED OUTPUT POWER (%) SP48S3.3-66 (888) 597-WALL www.wallindustries.com 5 of 7 Rev C APPLICATION NOTES WALL INDUSTRIES, INC. TYPICAL OUTPUT RIPPLE VOLTAGE 20mV/div, 2 us/div, full load 48 vin 10 uF decoupling cap. Room temperature. SP & SPW SERIES TYPICAL INPUT REFLECTED RIPPLE CURRENT 20mA/div, full load 48 vin.(using 12uH, 33uF (low ESR) source impedance). Room temperature. TYPICAL RISE TIME AND TURN ON DELAY USING LOGIC ENABLE 1 V/div, 10 mS/div, (vout) 2 V/div, 10 mS/div (logic enable) 48 vin, full load. Room temperature. TYPICAL RISE TIME AND TURN ON DELAY WITH VIN 0-48V 1V/div, 10 mS/div, (vout) 20 V/div 10 mS/div (vin) 48 vin full load. Room temperature. SP48S3.3-66 (888) 597-WALL www.wallindustries.com 6 of 7 Rev C APPLICATION NOTES WALL INDUSTRIES, INC. SP48S3.3-66 Ordering Information: Part Number Example: SP 48 S 3.3 - 66 R Series Designation Nominal Input Voltage Single Output Nominal Output Voltage Maximum Output Power Options Blank Leave Blank for Active High Enable R Active Low Enable Company Information: Wall Industries, Inc. has created custom and modified units for over 40 years. Our in-house research and development engineers will provide a solution that exceeds your performance requirements on time and on budget. Our ISO9001-2000 certification is just one example of our commitment to producing a high quality, well documented product for our customers. Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for working closely with its customers to ensure each solution meets or exceeds form, fit and function requirements. We will continue to provide ongoing support for your project above and beyond the design and production phases. Give us a call today to discuss your future projects. Contact Wall Industries for further information: Phone: Toll Free: Fax: E-mail: Web: Address: (888) 597-WALL (603)778-2300 (888)587-9255 (603)778-9797 [email protected] www.wallindustries.com 5 Watson Brook Rd. Exeter, NH 03833 www.wallindustries.com 7 of 7