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QPO-1-EVAL3
QPO-1 Evaluation Board, Micro Foot Print DC-DC Converters
Description
The QPO-1-EVAL3 is designed to allow full testing of
the QPO-1 and its various performance settings to
optimize final system design. The board offers switch
settings for the user to select preset values for the
Rhr, Rsc, and Rsa resistors. Solder pads are available
to mount user-selected values of these components if
required. Please refer to the QPO-1 product data
sheet, and the following pages for the proper
application of this board. The EVAL3 accommodates
Vicor鈥檚 quarter brick DC-DC converters with an input
up to 72 Vdc.
The QPO-1 output ripple attenuator SiP uses active
filtering to reduce output ripple and noise (PARD)
over 20 dB from 50 Hz to 500 kHz. The QPO-1
operates over a voltage range from 3 to 30 Vdc and
supports load currents as high as 10A. Output
regulation is maintained with remote sense or trim
adjustment of the power supply. The closed loop
architecture improves transient response and ensures
precise point-of-load regulation.
Other eval boards (see part numbering description)
allow easy evaluation with other DC-DC converters
or power supplies with standard terminations.
Features of the QPO-1
鈥?>30 dB PARD attenuation, 1 kHz to 500 kHz
鈥?>20 dB PARD attenuation, 50 Hz to 500 Hz
1
鈥?10A rating over a 3-30 Vdc operating range
鈥?Supports precise point-of load regulation
鈥?Up to 99% efficiency with power limit protection
鈥?User selectable optimization of attenuation,
power dissipation & transient load response
鈥?Peak detector function optimizes for ripple
amplitude variation automatically
鈥?1.0 x 1.0 x 0.2鈥?SiP with BGA or LGA mounting
鈥?Improves transient response of most DC-DC
converters and power supplies
鈥?Reduces required number of output capacitors
to support dynamic loads.
鈥?Patents Pending
Note 1: For off-line supplies 20dB attenuation can be achieved
down to 50Hz with additional capacitance added from the
VREF pin to the REFGND pin.
Typical Application
QPO-1 Performance
LOAD+
VOUT+
SENSE+
QPO-1
SC
SC
REFGND
SC SET
CESR
VREF
QPO IN
QPO OUT
QPO IN (AC)
Rsc
Cout
GND
QPO OUT (AC)
Rhr
SENSE-
VOUT-
LOAD-
LOAD CURRENT (DC) 1A/DIV
Figure 1 鈥?/div>
SC/Trim supports applications that don鈥檛
require remote sense.
Picor Corporation 鈥?www.picorpower.com
Figure 2 鈥?/div>
Typical performance with a 3.3 Volt converter.
QPO-1-EVAL3 Data Sheet Rev. 1.1
Page 1 of 4
VICOR
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