SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet Features Applications * * * * Telecommunications Data communications Wireless communications Servers, workstations Benefits * High efficiency - no heat sink required * Cost effective, single board design * Small size and low-profile * RoHS lead-free solder and lead-solder-exempted products are available * Industry-standard DOSA pinout * Output: 5.0 V at 7 A * On-board input differential LC-filter * Start-up into pre-biased load * No minimum load required * Weight: 0.44 oz [12.3 g] * Meets Basic Insulation requirements of EN60950 * Withstands 100 V input transient for 100 ms * Fixed-frequency operation * Hiccup overcurrent protection * Fully protected (OTP, OCP, OVP, UVLO) * Remote sense * Remote ON/OFF positive or negative logic option * Output voltage trim range: +10%/-20% with industry-standard trim equations * Low height of 0.374" (9.5mm) * Industry standard 1/16th brick footprint: 0.9" by 1.3" * High reliability: MTBF = 16.23 million hours, calculated per Telcordia TR-332, Method I Case 1 * UL60950 recognized in US and Canada and DEMKO certified per IEC/EN60950 * Designed to meet Class B conducted emissions per FCC and EN55022 when used with external filter * All materials meet UL94, V-0 flammability rating Description The new SSQE48T07050 DC-DC converter is an open frame sixteenth-brick DC-DC converter that conforms to the Distributed Open Standards Architecture (DOSA) specifications. The converter operates over an input voltage range of 36 to 75 VDC, and provides a tightly regulated output voltage with an output current up to 7 A. The output is fully isolated from the input and the converter meets Basic Insulation requirements permitting a positive or negative output configuration. The converter is constructed using a single-board approach with both planar and discrete magnetics. The standard feature set includes remote On/Off (positive or negative logic), input undervoltage lockout, output overvoltage, overcurrent, and short circuit protections, output voltage trim, and overtemperature shutdown with hysteresis. With standard pinout and trim equations and excellent thermal performance, the SSQE48T07050 converters can replace in most cases existing eighth-brick converters. Inclusion of this converter in a new design can result in significant board space and cost savings. ZD-02096 Rev. 1.0 www.power-one.com Page 1 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet Electrical Specifications Conditions: TA = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 F, unless otherwise specified. Parameter Notes Min Typ Max Units Absolute Maximum Ratings Input Voltage 0 80 VDC Operating Ambient Temperature Continuous -40 85 C Storage Temperature -55 125 C Isolation Characteristics I/O Isolation 2250 Isolation Capacitance VDC 150 Isolation Resistance pF 10 M Feature Characteristics Switching Frequency 440 Output Voltage Trim Range1 Remote Sense Compensation Industry-standard equations (5.0V) 1 Output Overvoltage Protection Overtemperature Shutdown (PCB) Peak Backdrive Output Current during startup into prebiased output Backdrive Output Current in OFF state Auto-Restart Period Turn-On Time -20 Percent of VOUT(NOM) Non-latching 120 kHz +10 130 Non-latching Sinking current from external voltage source equal VOUT(NOM) - 0.6V and connected to output via 1Ohm resistor Converter is OFF; External voltage=5 VDC Applies to all protection features 125 See Figures E, F, and G % +10 % 140 % C 50 mADC 10 mADC 200 ms 5 ms ON/OFF Control (Positive Logic) Converter Off (logic low) -20 0.8 VDC Converter On (logic high) 2.4 20 VDC Converter Off (logic high) 2.4 20 VDC Converter On (logic low) -20 0.8 VDC ON/OFF Control (Negative Logic) Mechanical Weight 12.3 g Reliability MTBF Telcordia SR-332, Method I Case 1 50% electrical stress, 40C ambient 16.23 MHrs Additional Notes: 1 Vout can be increased up to 10% via the sense leads or 10% via the trim function. However, the total output voltage trim from all sources shall not exceed 10% of VOUT(NOM) in order to ensure specified operation of overvoltage protection circuitry. ZD-02096 Rev. 1.0 www.power-one.com Page 2 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet Electrical Specifications (continued) Conditions: TA = 25 C, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 F, unless otherwise specified. Parameter Notes Min Typ Max Units 36 48 75 VDC Turn-on Threshold 34 35 36 VDC Turn-off Threshold 32 33 34 100 VDC VDC 1.2 ADC Input Characteristics Operating Input Voltage Range Input Under-voltage Lockout Input Voltage Transient 100 ms Maximum Input Current VIN = 36VDC , IOUT=7ADC Input Stand-by Current Vin = 48V, converter disabled Input No Load Current (0 load on the output) Input Reflected-Ripple Current, is Input Voltage Ripple Rejection 10 mA Vin = 48V, converter enabled 32 mA Vin = 48V, 25 MHz bandwidth 10 mAPK-PK 120 Hz 90 dB Output Characteristics External Load Capacitance Plus full resistive load Output Current Range Current Limit Inception 5.0 VDC 0 Non-latching, for 5.0 VDC 7.7 Peak Short-Circuit Current Non-latching, Short = 10 m RMS Short-Circuit Current Non-latching Output Voltage Setpoint Accuracy (no load) 10,000 F 7 ADC 9.8 ADC 9.8 A 1.2 -1.6 Arms +1.6 %VOUT 5 mV Output Regulation Over Line 2 Over Load 2 Over line, load and temperature2 Full load + 10F tantalum + 1F ceramic Overall Output Voltage Regulation Output Ripple and Noise - 25 MHz bandwidth -3 65 5 mV +3 %Vout 100 mVPK-PK Dynamic Response Load Change 50%-75%-50% of Iout Max, di/dt = 0.1 A/s Settling Time to 1% of Vout Load Change 50%-75%-50% of Iout Max , di/dt = 5 A/s Settling Time to 1% of Vout Co = 1 F ceramic + 10 uF tantalum Figure 8 Co = 470 F POS + 1 F ceramic Figure 9 100 mV 40 s 80 mV 80 s Efficiency 100% Load VOUT = 5.0 VDC 91 % 50% Load VOUT = 5.0 VDC 88.5 % Additional Notes: 2 Operating ambient temperature range is -40 C to 85 C ZD-02096 Rev. 1.0 www.power-one.com Page 3 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet Operations Input and Output Impedance These power converters have been designed to be stable with no external capacitors when used in low inductance input and output circuits. However, in some applications, the inductance associated with the distribution from the power source to the input of the converter can affect the stability of the converter. A 33 F electrolytic capacitor with an ESR < 1 across the input is recommended to ensure stability of the converter over the wide range of input source impedance. to the ON/OFF input, in which case it must be capable of sourcing or sinking up to 1 mA depending on the signal polarity. See the Startup Information section for system timing waveforms associated with use of the ON/OFF pin. Remote Sense (Pins 5 and 7) The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter and the load. The SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should be connected at the load or at the point where regulation is required (see Fig. B). In many applications, the user has to use decoupling capacitance at the load. The power converter will exhibit stable operation with external load capacitance up to 10,000 F. ON/OFF (Pin 2) Vin (+) SSQE48 Converter (Top View) Vout (+) Rw 100 SENSE (+) Vin ON/OFF TRIM Rload SENSE (-) The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control options available, positive and negative logic, both referenced to Vin(-). A typical connection is shown in Fig. A. 10 Vin (-) Vout (-) Rw Fig. B: Remote sense circuit configuration. CAUTION Vin (+) SSQE48 Converter (Top View) ON/OFF Vin Vout (+) SENSE (+) TRIM Rload SENSE (-) Vin (-) Vout (-) CONTROL INPUT Fig. A: Circuit configuration for ON/OFF function. The positive logic version turns on when the ON/OFF pin is at a logic high and turns off when the pin is at a logic low. The converter is on when the ON/OFF pin is left open. See the Electrical Specifications for logic high/low definitions. The negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. The ON/OFF pin can be hard wired directly to Vin(-) to enable automatic power up of the converter without the need of an external control signal. The ON/OFF pin is internally pulled up to 5 V through a resistor. A properly de-bounced mechanical switch, open-collector transistor, or FET can be used to drive the input of the ON/OFF pin. The device must be capable of sinking up to 0.2 mA at a low level voltage of 0.8 V. An external voltage source (20 V maximum) may be connected directly ZD-02096 Rev. 1.0 If remote sensing is not utilized, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin must be connected to the Vout(+) pin (Pin 8) to ensure the converter will regulate at the specified output voltage. If these connections are not made, the converter will deliver an output voltage that is slightly higher than the specified data sheet value. Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces should be run side by side and located close to a ground plane to minimize system noise and ensure optimum performance. The converter's output overvoltage protection (OVP) senses the voltage across Vout(+) and Vout(-), and not across the sense lines, so the resistance (and resulting voltage drop) between the output pins of the converter and the load should be minimized to prevent unwanted triggering of the OVP. When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given conditions. When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rating in order to maintain the required voltage across the load. Therefore, the www.power-one.com Page 4 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the same percentage to ensure the converter's actual output power remains at or below the maximum allowable output power. To decrease the output voltage (Fig. D), a trim resistor, RT-DECR, should be connected between the TRIM (Pin 6) and SENSE(-) (Pin 5), with a value of: Output Voltage Adjust /TRIM (Pin 6) where, The output voltage can be adjusted up 10% or down 20%. Trim up to 10% is guaranteed only at Vin 40V, and it is approximately 8% to 10% at Vin = 36V. RT-DECR = Required value of trim-down resistor [k] and is defined above. The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1 F capacitor is connected internally between the TRIM and SENSE(-) pins. Note: RT-DECR = SSQE48 Converter (Top View) ON/OFF Vout (+) SENSE (+) TRIM SENSE (-) [k], Vin (-) Rload RT-DECR Vout (-) Fig. D: Configuration for decreasing output voltage. where, RT-INCR = Required value of trim-up resistor [k] Trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could cause unwanted triggering of the output overvoltage protection (OVP) circuit. The designer should ensure that the difference between the voltages across the converter's output pins and its sense pins does not exceed 10% of VOUT(nom), or: VO-NOM = Nominal value of output voltage [V] = Vin (+) Vin 5.11(100 + )VO-NOM - 626 - 10.22 1.225 [k] The above equations for calculation of trim resistor values match those typically used in conventional industry-standard quarterbricks, eighth-bricks and sixteenth-bricks. To increase the output voltage, refer to Fig. C. A trim resistor, RT-INCR, should be connected between the TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of: RT-INCR = 511 - 10.22 || (VO -REQ - VO-NOM) X 100 VO -NOM [%] VO-REQ = Desired (trimmed) output voltage [V]. When trimming up, care must be taken not to exceed the converter`s maximum allowable output power. See the previous section for a complete discussion of this requirement. Vin (+) SSQE48 Converter [VOUT(+) - VOUT(-)] - [VSENSE(+) - VSENSE(-)] VO - NOM X 10% [V] This equation is applicable for any condition of output sensing and/or output trim. Vout (+) (Top View) SENSE (+) Vin ON/OFF R T-INCR TRIM Rload SENSE (-) Vin (-) Vout (-) Fig. C: Configuration for increasing output voltage. ZD-02096 Rev. 1.0 www.power-one.com Page 5 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet UL60950 and EN60950. Basic Insulation is provided between input and output. Protection Features Input Undervoltage Lockout Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops below a pre-determined voltage. The input voltage must be typically 35 V for the converter to turn on. Once the converter has been turned on, it will shut off when the input voltage drops typically below 33 V. This feature is beneficial in preventing deep discharging of batteries used in telecom applications. Output Overcurrent Protection (OCP) The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the converter will switch to constant current operation and thereby begin to reduce output voltage. During short circuit, when the output voltage drops significantly below 50% its nominal value, the converter will shut down. Once the converter has shut down, it will attempt to restart nominally every 200 ms with a very low duty cycle. The attempted restart will continue indefinitely until the overload or short circuit conditions are removed. Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and continues normal operation. Output Overvoltage Protection (OVP) The converter will shut down if the output voltage across Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of the OVP circuitry. The OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the converter has shut down, it will attempt to restart every 200 ms until the OVP condition is removed. The converters have no internal fuse. If required, the external fuse needs to be provided to protect the converter from catastrophic failure. Refer to the "Input Fuse Selection for DC/DC converters" application note on www.power-one-com for proper selection of the input fuse. Both input traces and the chassis ground trace (if applicable) must be capable of conducting a current of 1.5 times the value of the fuse without opening. The fuse must not be placed in the grounded input line. Abnormal and component failure tests were conducted with the input protected by a 5A fuse. If a fuse rated greater than 5A is used, additional testing may be required. To protect a group of converters with a single fuse, the rating can be increased from the recommended value above. Electromagnetic Compatibility (EMC) EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics of board mounted component DC-DC converters exist. However, Power-One tests its converters to several system level standards, primary of which is the more stringent EN55022, Information technology equipment Radio disturbance characteristics-Limits and methods of measurement. An effective internal LC differential filter significantly reduces input reflected ripple current, and improves EMC. With the addition of a simple external filter, all versions of the SSQE48T07050 converters pass the requirements of Class B conducted emissions per EN55022 and FCC requirements. Please contact Power-One Applications Engineering for details of this testing. Overtemperature Protection (OTP) The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation outside the thermal derating curves, or operation in abnormal conditions such as system fan failure. Converter will automatically restart after it has cooled to a safe operating temperature. Safety Requirements The converters meet North American and International safety regulatory requirements per ZD-02096 Rev. 1.0 www.power-one.com Page 6 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet V IN Startup Information (using negative ON/OFF) Scenario #1: Initial Startup From Bulk Supply ON/OFF function enabled, converter started via application of VIN. See Figure E. Time Comments t0 ON/OFF pin is ON; system front-end power is toggled on, VIN to converter begins to rise. t1 VIN crosses undervoltage Lockout protection circuit threshold; converter enabled. t2 Converter begins to respond to turn-on command (converter turn-on delay). t3 Converter VOUT reaches 100% of nominal value. For this example, the total converter startup time (t3- t1) is typically 5 ms. ON/OFF STATE OFF ON V OUT t0 t1 t2 t t3 Fig. E: Startup scenario #1. VIN Scenario #2: Initial Startup Using ON/OFF Pin With VIN previously powered, converter started via ON/OFF pin. See Figure F. Time Comments t0 VINPUT at nominal value. t1 Arbitrary time when ON/OFF pin is enabled (converter enabled). t2 End of converter turn-on delay. t3 Converter VOUT reaches 100% of nominal value. For this example, the total converter startup time (t3- t1) is typically 5 ms. Scenario #3: Turn-off and Restart Using ON/OFF Pin With VIN previously powered, converter is disabled and then enabled via ON/OFF pin. See Figure G. Time Comments t0 VIN and VOUT are at nominal values; ON/OFF pin ON. t1 ON/OFF pin arbitrarily disabled; converter output falls to zero; turn-on inhibit delay period (200 ms typical) is initiated, and ON/OFF pin action is internally inhibited. t2 ON/OFF pin is externally re-enabled. If (t2- t1) 200 ms, external action of ON/OFF pin is locked out by startup inhibit timer. If (t2- t1) > 200 ms, ON/OFF pin action is internally enabled. t3 Turn-on inhibit delay period ends. If ON/OFF pin is ON, converter begins turn-on; if off, converter awaits ON/OFF pin ON signal; see Figure F. t4 End of converter turn-on delay. t5 Converter VOUT reaches 100% of nominal value. For the condition, (t2- t1) 200 ms, the total converter startup time (t5- t2) is typically 205 ms. For (t2- t1) > 200 ms, startup will be typically 5 ms after release of ON/OFF pin. ZD-02096 Rev. 1.0 ON/OFF STATE OFF ON VOUT t0 t1 t2 t t3 Fig. F: Startup scenario #2. VIN 200 ms ON/OFF STATE OFF ON VOUT www.power-one.com t0 t1 t2 t3 t4 t t5 Fig. G: Startup scenario #3. Page 7 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet (ii) The temperature of the transformer does not exceed 125C, or (iii) The nominal rating of the converter. Characterization General Information The converters have been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for vertical and horizontal mounting, efficiency, startup and shutdown parameters, output ripple and noise, transient response to load step-change, overload, and short circuit. During normal operation, derating curves with maximum FET temperature less or equal to 125C should not be exceeded. Temperature at thermocouple locations TC1 and TC2 shown in Fig. H should not exceed 100C and 125C respectively, in order to operate inside the derating curves. Test Conditions All data presented were taken with the converter soldered to a test board, specifically a 0.060" thick printed wiring board (PWB) with four layers. The top and bottom layers were not metallized. The two inner layers, comprised of two-ounce copper, were used to provide traces for connectivity to the converter. The lack of metallization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the PWB was minimized. This provides a worst-case but consistent scenario for thermal derating purposes. All measurements requiring airflow were made in the vertical and horizontal wind tunnel using Infrared (IR) thermography and thermocouples for thermometry. Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in the application. Thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. The use of AWG #40 gauge thermocouples is recommended to ensure measurement accuracy. Careful routing of the thermocouple leads will further minimize measurement error. Refer to Fig. H for the recommended measuring thermocouple location. Thermal Derating Load current vs. ambient temperature and airflow rates are given in Figure 1. Ambient temperature was varied between 25 C and 85 C, with airflow rates from 30 to 500 LFM (0.15 to 2.5 m/s). For each set of conditions, the maximum load current was defined as the lowest of: (i) The output current at which any FET junction temperature does not exceed a maximum specified temperature of 125C as indicated by the thermographic image, or ZD-02096 Rev. 1.0 Fig. H: Locations of the thermocouple for thermal testing. Efficiency Figure 2 shows the efficiency vs. load current plot for ambient temperature of 25C, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and input voltages of 36V, 48V, 65V, and 75V. Also, a plot of efficiency vs. load current, as a function of ambient temperature with Vin=48V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Figure 3. Power Dissipation Figure 4 shows the power dissipation vs. load current plot for Ta = 25C, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and input voltages of 36V, 48V, 65V, and 75V. Also, a plot of power dissipation vs. load current, as a function of ambient temperature with Vin = 48V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Figure 5. Startup Output voltage waveforms during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are shown without and with external load capacitance in Figure 6 and Figure 7, respectively. Ripple and Noise Figure 10 shows the output voltage ripple waveform, measured at full rated load current with a 10 F tantalum and 1F ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1F ceramic capacitor. The input reflected-ripple current waveforms are obtained using the test setup shown in Figure 11. www.power-one.com Page 8 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet 8 7 Load Current, A 6 5 4 3 NC ~ 30 LFM (0.15 m/s) 100 LFM (0.5 m/s) 200 LFM (1 m/s) 300 LFM (1.5 m/s) 400 LFM (2 m/s) 500 LFM (2.5 m/s) 2 1 0 20 30 40 50 60 70 80 90 Ambient Temperature, C 93 93 88 88 Efficiency, % Efficiency, % Figure 1. Available load current vs. ambient air temperature and airflow rates for SSQE48T07050 converter mounted vertically with air flowing from pin 1 to pin 3, Vin = 48 V. Note: NC - Natural convection 83 36V 48V 65V 78 83 40C 78 55C 75V 75C 73 73 0 Figure 2. 1 2 3 4 Load Current, A 5 6 7 Efficiency vs. load current and input voltage for SSQE48T07050 converter mounted vertically with air flowing from pin 1 to pin 3 at a rate of 300 LFM (1.5 m/s) and Ta=25C. ZD-02096 Rev. 1.0 0 1 2 3 4 Load Current, A 5 6 7 Figure 3. Efficiency vs. load current and ambient temperature for SSQE48T07050 converter mounted vertically with Vin=48V and air flowing from pin 1 to pin 3 at a rate of 200LFM (1.0m/s). www.power-one.com Page 9 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet Power Dissipation, W 5 36V 48V 4 65V 75V 3 2 1 0 Figure 4. 1 2 3 4 Load Current, A 5 6 7 Power dissipation vs. load current and input voltage for SSQE48T07050 converter mounted vertically with air flowing from pin 1 to pin 3 at a rate of 300 LFM (1.5 m/s) and Ta = 25 C. Figure 7. Turn-on transient at full rated load current (resistive) plus 10,000 F at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5V/div) Bottom trace: Vout (2V/div.), Time: 5 ms/div. Figure 8. Output voltage response to load current stepchange (3.5A-5.25A-3.5A) at Vin=48V. Top trace: Vout (100 mV/div.). Bottom trace: Iout (2 A/div.)., Time: (0.2 ms/div.) Current slew rate: 0.1 A/s. Co=1F ceramic + 10F tantalum. Figure 9. Output voltage response to load current stepchange (3.5A-5.25A-3.5A) at Vin=48V. Top trace: Vout (100 mV/div.). Bottom trace: Iout (2 A/div.), Time: (0.2 ms/div.). Current slew rate: 5A/s. Co=470F POS + 1F ceramic.. Power Dissipation, W 5 4 40C 55C 75C 3 2 1 0 1 2 3 4 Load Current, A 5 6 7 Figure 5. Power dissipation vs. load current and ambient temperature for SSQE48T07050 converter mounted vertically with Vin = 48 V and air flowing from pin 1 to pin 3at a rate of 200 LFM (1.0 m/s). Figure 6. Turn-on transient at full rated load current (resistive) at Vin = 48 V, triggered via ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom trace: Vout (2V/div), Time: 5 ms/div. ZD-02096 Rev. 1.0 www.power-one.com Page 10 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet Figure 10. Output voltage ripple (20 mV/div.) at full rated load current into a resistive load with Co = 10 F tantalum + 1 F ceramic and Vin = 48 V. Time: 1s/div. 10 H source inductance Vsource iC 33 F ESR < 1 electrolytic capacitor Input reflected ripple-current, iC (200 mA/div.), measured at input terminals at full rated load current and Vin=48 V. Refer to Figure 11 for test setup. Time: 1s/div. 5.0 SSQE48 DC-DC Converter 1 F Ceramic + 10 F Vout Tantalum Capacitor Vout [Vdc] iS Figure 13. 4.0 3.0 2.0 1.0 Figure 11. Test setup for measuring input reflected ripple currents, ic and is. 2 4 6 Iout [Adc] 8 10 Figure 14. Output voltage vs. load current showing current limit point and converter shutdown point. Input voltage has almost no effect on current limit characteristic. Figure 12. Input reflected-ripple current, iS (10 mA/div.), measured through 10 H at the source at full rated load current and Vin=48 V. Refer to Figure 11 for test setup. Time: 1 s/div. Figure 15. Load current (5 A/div.) into a 10 m short circuit during restart, at Vin=48 V. Time: 50 ms/div. Bottom trace is an expansion of the on-time portion of the top trace (1 ms/div.) ZD-02096 Rev. 1.0 www.power-one.com Page 11 of 12 SSQE48T07050 DC-DC Converter Data Sheet 36-75 VDC Input; 5.0 VDC, 7 A Output Data Sheet Physical Information SSQE48T Pinout (Through-hole) Pad/Pin Connections Pad/Pin # 1 2 3 4 5 6 7 8 Function Vin (+) ON/OFF Vin (-) Vout (-) SENSE(-) TRIM SENSE(+) Vout (+) HT (Max. Height) +0.000 [+0.00] -0.038 [- 0.97] 0.374 [9.5] Height Option A PL Pin Length Pin Option SSQE48T Platform Notes * All dimensions are in inches [mm] * Pins 1-3 and 5-7 are O 0.040" [1.02] with O 0.078" [1.98] shoulder * Pins 4 and 8 are O 0.062" [1.57] without shoulder * Pin material: Brass * Pin Finish: Matte Tin over Nickel * Converter Weight: 0.44 oz [12.3 g] CL (Min. Clearance) +0.016 [+0.41] -0.000 [- 0.00] 0.027 [0.7] 0.005 [0.13] A B C 0.188 [4.78] 0.145 [3.68] 0.110 [2.79] Converter Part Numbering/Ordering Information Product Input Mounting Series Voltage Scheme SSQE 48 Sixteenth 36-75 V Brick Format T T Throughhole Rated Load Current Output Voltage 07 050 07 7 ADC 050 5.0 V ON/OFF Logic - N N Negative P Positive Maximum Pin Length Height [PL] [HT] A A 0.374" B Special Features N Through hole N Sink A 0.188" current during B 0.145" start-up is C 0.110" limited to 50mA RoHS G No Suffix RoHS lead-solderexemption compliant G RoHS compliant for all six substances The example above describes P/N SSQE48T07050-NABNG: 36-75 V input, through-hole, 7 A @ 5.0 V output, negative ON/OFF logic, 0.145" pins, maximum height of 0.374", 50mA current sink during start-up, and RoHS compliant for all 6 substances. Consult factory for availability of other options. Notes: 1. NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of Power-One, Inc. 2. TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. ZD-02096 Rev. 1.0 www.power-one.com Page 12 of 12