P R E L I M I N A RY
™
QuietPower
QPI-1 B&L
QPI-1, 12 Amp Active EMI Filter
for DC-DC Converters
Description
Features QPI-1
The QPI-1 active EMI filter provides conducted
common-mode (CM) and differential-mode (DM)
attenuation from 150 kHz to 30 MHz. Active
filtering provides superior differential attenuation
at low frequencies. The product is designed for use
on a nominal 48 Vdc, (36-76 Vdc) bus. The QPI’s 12A
rating supports multiple DC-DC converters drawing
up to 576W at nominal input voltage and 60°C PCB
interface temperature.
• >40 dB CM attenuation at 500 kHz
• >80 dB DM attenuation at 500 kHz
• 80 Vdc (max input)
• 12 Amp rating
• 100 Vdc surge 100 ms
• 1,500 Vdc Hi-pot hold off to Shield Plane
• 1.0” x 1.0” x 0.2” SiP (System-in-Package)
• SMT Mounting Options- QPI-1L (Land Grid),
QPI-1B (Ball Grid)
Active filtering improves the transient response of
the filtered DC-DC converter(s) by virtually
eliminating ringing on the input in response to load
transients, as is often seen in passive filter solutions.
Units can be connected in series for higher
• -40° to +100°C PCB temperature (See Fig. 5)
• Active filtering improves transient response
• Efficiency 99%
attenuation, or in parallel for higher current.
• Parallelable for higher currents
• Connect in series for higher attenuation
• Agency Approvals Pending
The QPI-1 is available in a 1.0” x 1.0”x 0.2” SiP
(System-in-Package) with LGA or BGA mounting.
QPI-EVAL1 kits are available with a mounted QPI-1
and screw or pin terminal options for vertical and a
second layer (mezzanine board) horizontal
mounting. Check www.picorpower.com for the
evaluation board data sheet.
• Patents Pending
Typical Application
QPI Performance
SUPPLY+
BUS+
QPI+
QPI-
Cb*
Cc*
QPI-1
47µF
10µF
BUS-
SHIELD PLANE
SUPPLY-
TO CHASSIS OR
SAFETY COMMON
Y-CAP/SHIELD PLANE
*NOTE: Cb REQUIRED FOR HIGH TRANSIENT LOADS
Cc IS CERAMIC, LOW ESR & ESL
Figure 1 - QPI-1 circuit on input bus.
Figure 2 - Insertion loss curves showing common-mode and
differential -mode attenuation.
Picor Corporation • www.picorpower.com
QPI-1 Data Sheet Rev. 1.1 Page 1 of 4