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Active Output Ripple Attenuators
(QPO Series) 10 and 20 Amp
Features
®
C
n >30 dB PARD attenuation, 1 kHz to 500 kHz
S
US
n Supports precise point-of-load regulation
n Up to 99% efficient
n High density, low profile LGA package
n Reduces required number of output capacitors
to support dynamic loads
25 x 25 x 4.5 mm
n User selectable optimization of attenuation,
power dissipation, and transient load response
n Compatible with most DC-DC converters
Product Description
The QPO output ripple attenuator products use proprietary active filtering to reduce power
supply output ripple and noise (PARD) over 30 dB from 1 kHz to 500 kHz. QPOs improve
transient response, ensures quiet point-of-load regulation and works with most DC-DC
converters and switching power supplies. Output regulation is maintained using remote
sensing or the trim input of the power supply.
Load capacitance using this active technique can effectively be reduced by a factor of ten,
providing equivalent transient performance. In the typical application schematic below the
QPO was inserted between the converter and the load using no additional load capacitance.
As shown in the performance plot, the drop in load voltage (approx. 10 mV; channel 2) was
significantly reduced when compared to the converter output (approx. 100 mV; channel 1)
with a 10 A transient load current step. The ripple voltage amplitude was also reduced by a
similar factor at the load.
Applications
n Telecom base station power amplifiers
n Low noise POL
n Industrial test and measurement
n Sensors requiring low-noise
power
n Medical instrumentation
n Military targeting and displays
n Lasers and optical systems
Part Numbering
Part Number
Input
Voltage
Current
Rating
Attenuation
QPO-1LZ-(01)
3 – 30 Vdc
10 A
>30 dB PARD, 1 kHz to 500 kHz
QPO-2LZ-(01
0.3 – 5.5 Vdc
20 A
>20 dB PARD, 1 kHz to 500 kHz, Aux. Bus bias
(-01 designates open frame)
VOUT+
Rsc
SENSE+
QPO-1LZ
RSL
CESR
SC
GND
VREF
CSC
Cout
SC SET
REFGND
SC
LOAD+
QPO OUT
QPO IN
RHR
SENSEVOUT-
LOAD-
Figure 1: Typical Application
Figure 2: Performance
vicorpower.com • 800 927.9474
Rev 1.1 07/2014
C
NRT
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