Richardson, Texas - Ericsson Microelectronics says its PKD 4000 series is the first surface-mountable dc/dc converter module in the 30-watt range to meet the forthcoming requirements of high-temperature reflow processes for lead-free soldering.
The units, which also target telecommunications applications, were launched along with two dc/dc converter half bricks in the PKJ 4000 series. Largely through packaging, the half bricks address the higher densities and thermal loads of more hostile environments.
In addition, Ericsson extended its hot-pluggable PKL 4000 series with a 28.2-volt half brick that addresses wireless power amplifier applications.
The first module in the lead-free PKD 4000 series, the PKD 4210 SI, features a ceramic substrate with thick-film technology and a patented mechanical design to accommodate the reflow operation. It is aimed at addressing the concerns of both manufacturers and users for environmentally safe lead-free operation, yet reliable board mounting.
Historically, the reluctance of manufacturers to trust new processes, and the job of minimizing the weight of robust converters for quick board mounting has been a major challenge to implementing the lead-free approach in a converter with moderate power capability.
The PKD 4210 SI addresses both concerns. It measures only 1.81 x 1.97 x 0.3 inch high and weighs less than 20 grams to facilitate surface mounting with automated pick-and-place equipment.
The PKD 4210 SI is for OEMs requiring a distributed power architecture for their radio basestations, routers and switches. It delivers 8 A at 3.3 V over a wide temperature range without a heat sink. That capability is due to its synchronous-rectifier design, which provides a typical efficiency of 89 percent from 30 percent to full load. The module maintains full output power at ambient temperatures to 78 degrees C with 200 linear feet per minute (about 1 meter/second) forced-convection cooling.
Electrical specs include line and load regulation of 5 millivolts, output ripple and noise of 100 mV peak to peak (5-MHz bandwidth), and output voltage initial setting and accuracy of 3.32 percent (all specs maximum values).
Load transient recovery is typically 100 microseconds for a 50 percent load step over its current range of 10 to 100 percent at an input of 53 V. Input-to-output isolation is 1.5 kVdc.
Ericsson's second release, the PKJ 4128 PIT, is a dual-output, 110-W module. It's part of the company's PKJ 4000 series of single- and dual-output devices that go to 150 W. It offers 3.3 V at 12 A, and 5 V at 15 A in high ambient temperatures and low airflow and without a heat sink. An optional heat sink is available for more demanding environments. It includes individual, tightly regulated outputs in the same mechanical size as an industry-standard dual half-brick.
The PKJ 4128 PIT features overvoltage and overtemperature protection, current-limit protection, undervoltage detection, output voltage adjust and local as well as remote on/off. Stated mean time between failures (MTBF) is in excess of 3 million hours. These modules meet EN55022 and EN61000 requirements for electromagnetic compatibility, and conform to EN60950 for isolation (1.5 kVdc).
Also, Ericsson extended its hot-pluggable PKL 4000 series with a 28.2-V half brick that addresses wireless power amp applications. Delivering up to 310 W, the 11-A PKL 4316 PIT has double the power density of the typical half brick, because of thermal-management elements that move heat efficiently away from key electronics.
The PKL 4000 series is short-circuit-proof and includes built-in overvoltage, undervoltage and overtemperature protection. It also features soft start, remote turn-on, output adjustment and remote sensing. The series includes models with output voltages from 1.8 to 12 V at up to 60-A output (310 W power limited).
The 27-W PKD 4210 SI is priced at $56.60 each. The PKJ 4128 PIT dual-output half brick sells for $116.25, and the PKL 4316 PIT for $154 each, all in 500 pieces. Samples are available from stock.
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EETInfo No. 627