APPLICATION NOTES Rev C SP24S12-75 75W DC-DC Converter 18-36 Vdc Input 12 Vdc Output at 6.25A Half-Brick Package Features: x 84% 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. S P & SPW S E R I E S Model No. SP24S12-75 Technical Specifications 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 / ' V Load step / ' 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 18 12uH / 33uF input filter 11.88 NOM MAX Unit Measured 17 16 Volt DC Volt DC 38 37 24 5.2 63 <1 1 19 Volt DC Volt DC Volt DC A mA mA A2 Sec mA 12 36 12.12 ± 0.1 ± 0.1 0.02 Rated Output Current Self Resetting 0 7.5 55 105 8.75 Volt DC % % % / oC mV mV A A A/sec 180 6.25 10.4 120 Hz 60 dB 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 150 160 180 345 0 mV mV Psec msec % 84 84 84 80 % % % % X X RTc-a 7.5 6.2 5.1 4.3 3.5 o 400 KHz TTL Volt DC o C C/Watt C/Watt o C/Watt o C/Watt o C/Watt o Available, Contact Factory Fixed Active HIGH, Open Collector 10.8 13.2 105 Case Temperature Bellcore TR-332 3.51E6 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 WALL INDUSTRIES, INC. Rev C 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. S P & SPW S E R I E S DERATING CURVE OUTPUT POWER (WATTS) 80 70 0 LFM 60 100 LFM 200 LFM 300 LFM 400 LFM 50 40 30 20 10 0 0 20 40 60 80 AMBIENT TEMPERATURE (DEG. C.) POWER DISSIPATION VS OUTPUT CURRENT POWER DISSIPATION (WATTS) 18 Low Line 16 14 12 Nominal Line 10 8 6 4 High Line 2 0 0 1 2 3 4 5 6 OUTPUT CURRENT (AMPS) EFFICIENCY VS OUTPUT CURRENT Low Line EFFICIENCY (%) 85 75 Nominal Line 65 55 High Line 45 0 1 2 3 4 5 6 OUTPUT CURRENT (AMPS) (888) 597-WALL www.wallindustries.com 5 of 7 Rev C APPLICATION NOTES WALL INDUSTRIES, INC. S P & SPW S E R I E S TYPICAL OUTPUT RIPPLE 20mV/div, 1uS/div, full load, 18Vin 10uF // 0.1uF decoupling cap at room temp TYPICAL OUTPUT RIPPLE 50mV/div, 1uS/div, full load 36Vin 10uF // 0.1uF decoupling cap at room temp TYPICAL INPUT RIPPLE CURRENT 4mA/div, 1uS/div, full load 24Vin at room temp with a 12uH / 33uF input filter TYPICAL TRANSIENT RESPONSE 50mV/div, 200uS/div, 50% full load to 75% full load 24Vin room temp TYPICAL RISE TIME & TURN-ON DELAY USING LOGIC ENABLE 2V/div, 40mS/div (Vout), 2V/div 40mS/div (logic enable) 18Vin, full load at room temp TYPICAL RISE TIME & TURN-ON DELAY WITH Vin 0-24V 2V/div, 40mS/div (Vout), 5V/div, 40mS/div (Vin) at room temp (888) 597-WALL www.wallindustries.com 6 of 7 TECHNICAL DATASHEET WALL INDUSTRIES, INC. Rev C SP24S12-75 Ordering Information: Part Number Example: SP 24 S 12 – 75 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