Picor Corporation • www.picorpower.com

QPO-1-EVAL5 Data Sheet Rev. 1.1 Page 1 of 4

P

P R

R E

E L

L II M

M II N

N A

A R

R Y

Y

QPO-1-EVAL5

QPO-1 Evaluation Board, Mini Foot Print DC-DC Converters

Description

The QPO-1-EVAL5 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 EVAL5 accommodates

Vicor’s Mini 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 30Vdc 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 www.picorpower.com) allow

easy evaluation with other DC-DC converters or

power supplies with standard terminations.

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.

Features of the QPO-1

• >30 dB PARD attenuation, 1 kHz to 500 kHz

• 10A rating over a 3-30 Vdc operating range

• Supports precise point-of load regulation

• Up to 99% efficiency with power limit protection

• User selectable optimization of attenuation,

power dissipation & transient load response

• Peak detector function optimizes for ripple

amplitude variation automatically

• 1.0 x 1.0 x 0.2” SiP with BGA or LGA mounting

• Improves transient response of most DC-DC

converters and power supplies

• Reduces required number of output capacitors

to support dynamic loads.

• Patents Pending

Typical Application

QPO-1 Performance

Rhr

SC SET

CESR

QPO OUT

VREF

SC

QPO IN

QPO-1

Cout

Rsc

VOUT+

VOUT-

SENSE+

SENSE-

SC

LOAD+

LOAD-

Figure 1 – SC/Trim supports applications without the use of

remote sense.

Figure 2 – Typical performance with a 3.3 Volt converter.

QPO IN (AC)

QPO OUT (AC)

LOAD CURRENT (DC) 1A/DIV