Q48T30018 BEL | Alldatasheet

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+86 755 298 85888 Europe, Middle East +353 61 225 977 North America +1 866 513 2839 © 2015 Bel Power Solutions, Inc. BCD.00767_AA The Q48T30018 through-hole mounted DC -DC converter offers unprecedented performance in the industry -standard quarter brick format. This is accomplished through the use of patent pending circuit and packaging techniques to achieve ultra -high efficiency, excellent thermal performance and a very low body profile. In telecommunications applications the Q Family 30 A converters provide thermal performance that far exceeds all quarter bricks and is comparable even to existing half -bricks. Low body profile and the preclusion of heat sinks minimize airflow shadowing, thus enhancing cooling for downstream devices. The use of 100% surface -mount technologies f or assembly, coupled with Power Bel Solutions advanced electric and thermal circuitry and packaging, results in a product with extremely high quality and reliability.  Delivers up to 30 A  Higher current capability at 70ºC than existing quarter brick and 30 A half brick converters  High efficiency: 84% @ 30 A, 85.5% @ 15 A  Start-up into pre-biased output  No minimum load required  No heat sink required  Low profile: 0.28” [7.2 mm]  Low weight: 1 oz [28 g] typical  Industry-standard footprint: 1.45” x 2.30”  Industry-standard pinout  Meets Basic Insulation Requirements of EN60950  Withstands 100 V input transient for 100 ms  On-board LC input filter  Fixed-frequency operation  Fully protected  Remote output sense  Output voltage trim range: +10%/-20%  Trim resistor via industry-standard equations  High reliability: MTBF 2.6 million hours, calculated per Telcordia TR- 332, Method I Case 1  Positive or negative logic ON/OFF option  Approved to the latest edition and amendment of ITE Safety standards, UL/CSA 60950-1 and IEC60950-1  Meets conducted emissions requirements of FCC Class B and EN55022 Class B with external filter  All materials meet UL94, V-0 flammability rating

tech.support@psbel.com Conditions: TA = 25ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified. PARAMETER CONDITIONS / DESCRIPTION MIN TYP MAX UNITS Absolute Maximum Ratings Input Voltage Continuous 0 80 VDC Operating Ambient Temperature -40 85 °C Storage Temperature -55 125 °C Input Characteristics Operating Input Voltage Range 36 48 75 VDC Input Under Voltage Lockout Non-latching Turn-on Threshold 33 34 35 VDC Turn-off Threshold 31 32 33 VDC Input Transient Withstand (Susceptibility) 100 ms 100 VDC Output Characteristics External Load Capacitance Plus full load (resistive) 30,000 μF Output Current Range 0 30 ADC Current Limit Inception Non-latching 33 36 40 ADC Peak Short-Circuit Current Non-latching. Short=10mΩ. 45 55 A RMS Short-Circuit Current Non-latching 8 Arms Isolation Characteristics I/O Isolation 2000 VDC Isolation Capacitance 230 ρF Isolation Resistance 10 MΩ Feature Characteristics Switching Frequency 435 kHz Output Voltage Trim Range1 Use trim equations on Page 6 -20 +10 % Remote Sense Compensation1 Percent of VOUT(NOM) +10 % Output Over-Voltage Protection Non-latching 117 122 127 % Over-Temperature Shutdown (PCB) Non-latching 118 °C Auto-Restart Period Applies to all protection features 100 ms Turn-On Time 2.5 ms ON/OFF Control (Positive Logic) Converter Off -20 0.8 VDC Converter On 2.4 20 VDC ON/OFF Control (Negative Logic) Converter Off 2.4 20 VDC Converter On -20 0.8 VDC Input Characteristics Maximum Input Current 30 ADC, 1.8 VDC Out @ 36 VDC In 1.8 ADC

circuitry. See further discussion at end of Output Voltage Adjust /TRIM section. load. The power converter will exhibit stable operation with external load capacitance up to 30,000 µF. Figure 1. Circuit configuration for ON/OFF function.

when the ON/OFF pin is left open. timing waveforms associated with use of the ON/OFF pin. Figure 2. Remote sense circuit configuration. connections are not made, the converter will deliver an output voltage that is slightly higher than the specified value. discretely, twisted pair wires should be used to connect the sense lines to the load to reduce susceptibility to noise. minimized to prevent unwanted triggering of the OVP. of the converter, equal to the product of the nominal output voltage and the allowable output current for the given conditions. output power remains at or below the maximum allowable output power. an externally connected resistor. internally between the TRIM and SENSE (-) pins.

Desired (trimmed) output voltage [V]. for a complete discussion of this requirement. Figure 3. Configuration for increasing output voltage. Figure 4. Configuration for decreasing output voltage.

0.18 SENSESENSEOUTOUT )](V)(V)([V  [V]

This equation is applicable for any condition of output sensing and/or output trim.

drops below 0.8 Vdc, the converter will shut down (Fig. 25). has shut down, it will attempt to restart every 100 ms until the OVP condition is removed. cooled to a safe operating temperature, it will automatically restart. Insulation is provided between input and output. recommended for use with this product. characteristics - Limits and methods of measurement. Figure 5. Input transient withstand capability per Bellcore

tech.support@psbel.com The converter has 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, start -up and shutdown parameters, output ripple and noise, transient response to load step-change, overload and short circuit. The following pages contain specific plots or waveforms associated with the converter. Additional comments for specific data are provided below. 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 metalized. The two inner layers, comprising two -ounce copper, were used to provide traces for connectivity to the converter. The lack of metalization 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 Power Bel Solutions vertical and horizontal wind tunnel facilities 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. Power Bel Solutions recommends the use of AWG #40 gauge thermocouples to ensure measurement accuracy. Careful routing of the thermocouple leads will further minimize measurement error. Refer to Figure 27 for optimum measuring thermocouple location. Load current vs. ambient temperature and airflow ra tes are given in Figs. 9 – 12. 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), and vertical and horizontal converter mounting. For each set of conditions, the maximum load current was defined as the lowest of: (i) The output current at which either any FET junction temperature did not exceed a maximum specified temperature (either 105°C or 120°C) as indicated by the thermographic image, or (ii) The nominal rating of the converter (30 A) During normal operation, derating curves with maximum FET temperature less than or equal to 120°C should not be exceeded. Temperature on the PCB at the thermocouple location shown in Fig. 2 7 should not exceed 118°C in order to operate inside the derating curves. Efficiency vs. load current plots are shown in Figs. 13 and 15 for ambient temperature of 25ºC, airflow rate of 300 LFM (1.5 m/s), both vertical and horizontal orientations, and input voltages of 36 V, 54 V and 72 V. Also, plots of efficiency vs. loa d current, as a function of ambient temperature with Vin = 54 V, airflow rate of 200 LFM (1 m/s) are shown for both a vertically and horizontally mounted converter in Figs. 14 and 16, respectively. 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 10,000 F load capacitance in Figs. 17 and 18, respectively.

tech.support@psbel.com

  • All dimensions are in inches [mm]
  • Pins 1-3 and 5-7 are Ø 0.040” [1.02] with Ø 0.078” [1.98] shoulder
  • Pins 4 and 8 are Ø 0.062” [1.57] without shoulder
  • Pin Material: Brass
  • Pin Finish: Tin/Lead over Nickel
  • Converter Weight: 1 oz [28 g] typical PAD/PIN CONNECTIONS Pad/Pin # Function

1 Vin (+)

2 ON/OFF

3 Vin (-)

4 Vout (-)

5 SENSE(-)

6 TRIM

7 SENSE(+)

8 Vout (+)

Height [HT] Pin Length [PL] Special Features RoHS Q 48 T 30 018 - N B A 0 G Quarter- Brick Format 36-75 V Trough - hole 30 Adc 018  1.8 V N  Negative P  Positive A  0.303” B  0.336” C  0.500” D  0.400” A  0.188” B  0.145” C  0.110” 0  STD No Suffix  RoHS lead-solder- exemption compliant G  RoHS compliant for all six substances The example above describes P/N Q48T30018-NBA0G: 36-75 V input, through-hole mounting, 30 A @ 1.8 V output, negative ON/OFF logic, a maximum height of 0.336”, a through the board pin length of 0.188” RoHS compliant for all six substances. Please consult factory regarding availability of a specific version. NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. 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.