MHz switching frequency-based devices enable miniaturization of the DC-DC converter and EMI filters
Achieving EMI conducted emission compliance for automobiles with a single stage filter. By Nicola Rosano, Sr. Strategic FA/System Engineer at Vicor
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A full brick package developed by TDK-Lambda, the PF1500B-360, is for high voltage distributed power architectures
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Both devices are designed to handle a load dump condition with 40V maximum rating as well as idle-stop and cold crank conditions with 3V under-voltage lockout rating.
The regulators maintain high-efficiency across a range of loads in the PWM mode and incorporate pulse frequency modulation (PFM) as the load reduces. This reduces switching and gate driver losses at light loads, says the company. Both incorporate frequency fold back to help prevent inductor current runaway during start up and provide enhanced dropout performance. Extensive safety and robust protection features include, pulse-by-pulse current limit, hiccup mode short circuit protection, open/short freewheeling diode protection, boot open/short voltage protection, VIN under-voltage lockout, and thermal shutdown. The A8587 also has a Negative Power On Reset (NPOR) function to indicate in-regulation and out-of-regulation status.
The A8586, A8586-2 and A8587 aid EMC performance by including frequency dithering, soft freewheel diode turn off, and well controlled switch node slew rates. A 4MHz oscillator allows the devices to switch outside EMI sensitive frequency bands such as the AM band or ADSL bands. The A8586-1 disables the frequency dithering feature. The A8586-1 and A8586-2 devices are options that disable the PFM function.
The A8586 is available in industry standard DFN-10 and SOIC-8 packages; the A8587 is available in DFN-10 package.
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