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QPO-1-EVAL1
QuietPower TM
QPO Evaluation Board
Description
The QPO-1-EVAL1 kit is designed to allow full testing of the QPO-1 and the various performance options to optimize a final system design. The board offers two terminal options for vertical or horizontal mounting. The user must select the required values for the Rhr, Rsc and Rsa resistors and solder them in the designated positions before applying power to the EVAL1. Please refer to the QPO-1 product data sheet, schematics and the following pages for the proper application of this board. The QPO-1 output ripple attenuator SiP uses active filtering to reduce output ripple and noise (PARD) over 20 dB from 500 Hz to 500 kHz and can be extended down to 50 Hz with additional capacitance added to the VREF pin. 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 quiet point-of-load regulation when used in conjunction with the power supply's control loop or trim node.
Features QPO-1
* >30 dB PARD attenuation, 1 kHz to 500 kHz * 3-30 Vdc operating range * 10A rating * Supports precise point-of load regulation * 90-99% efficiency * User selectable performance optimization for Attenuation, power dissipation, transient response * 1.0 x 1.0 x 0.2" SiP * LGA mounting * Closed control loop improves transient response of most DC-DC converters and power supplies * Reduces required number of output capacitors to support dynamic loads. * Evaluation board includes Johnson Jack for lownoise measurement of QPO performance.
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
QPO OUT (AC)
Rhr
GND
SENSEVOUT-
LOAD-
LOAD CURRENT (DC) 5A/DIV
Figure 1 - SC/Trim supports applications that don't require remote sense. Picor Corporation * www.picorpower.com
Figure 2 - Typical performance with a 3.3 Volt converter, showing 1 to 10 A load step. QPO-1-EVAL1 Data Sheet Rev. 1.2 Page 1 of 4
PC Board Layout Diagram
CHR RHR
QPO-1 EVAL BOARD LGA RSA
R1 J10 RSC CP
CESR
J12
RSU
DZ1 CSU
Q1 R2
J1
J2
Mounting Options Vertical Mount
1.800 0.442
CHR RHR
R1 RSA
QPO-1 EVAL BOARD LGA
J10 RSC CP
CESR
J12
RSU
DZ1 CSU
Q1 R2
J1
J2
Horizontal Mount
0.542
Picor Corporation * www.picorpower.com
US AND FOREIGN PATENTS, PATENTS PENDING
RSCSET
J3
PICOR QPO-1
J4
AVXXX
XXXXA
J9
J5
J6
J7
US AND FOREIGN PATENTS, PATENTS PENDING
RSCSET
J3
J4
J5
RP J11
RSENSE
C1
J8

J6 J7
AVXXX
PICOR QPO-1
XXXXA
PHIL
J9
RP J11
RSENSE
C1
J8
PHIL
1.600
QPO-1-EVAL1 Data Sheet Rev. 1.2 Page 2 of 4
Board Circuit Schematic
J11 JOHNSONJACK (NOT STUFFED) J12 JOHNSONJACK
18
QPO OUT
QPO IN
DZ1 18V
RSU 2K Q1 IRLML5103 CSU 1uF To J1 VREF
17
R2 100
QPO_IN
J7 QPO_IN J6 QPO_IN 11 12 13 14
J3 QPO_OUT J2 QPO_OUT 10 9 8 7 6 5 CESR 15uF RSCSET
RP 1K
QPO IN QPO IN QPO IN QPO IN
QPO OUT QPO OUT QPO OUT QPO OUT SC SET
GND
CP
20
GND
VREF
Start-up Assist Circuit
19 GND
REFGND 4
J5 SC
SLOPE ADJ
RSC
15 PEAK IN 16 SC
CESR
QPO-1
QPO_IN C1 15uF J8 SENSE+ RSENSE 51.1 QPO_OUT
J4 GND J9 GND J10 GND J1 VREF R1 0 Ohm RSA RHR CHR
Remote Sense Circuit
Instructions for Use
The EVAL1 board has the following components, QPO-1, Cesr=15uF and Rp=1k Ohm already soldered to the PCB as well as the zero-headroom start-up assist circuit shown in the schematic above. The remaining pads are spaced for 1206 chip size components. If these are not available to the user, once values are determined axial component leads can be formed to line up with the pads and hand soldered to the proper pads. Refer to the schematic and mechanical drawing above for the pad locations to connect these components. Component values can be determined using the formulas below. Refer to the QPO-1 product data sheet for a complete explanation of the features and the parameters set by these component values. First determine the headroom resistor value. The RSC resistor is tied between QPOout and SC SET pin and sets the correction current used to trim up the converter to maintain a constant output voltage on the QPO's output. The value for the SC SET resistor is calculated by the following equation:
1
2
3
RSC =
RIN * VOUT VRPT
where; RSC is the SC SET resistor value, RIN is the resistance of the SC or TRIM input of the converter, VOUT is the desired QPO output voltage, VRPT is the pre-trimmed reference of the SC or TRIM.
Rhr =
QPOout * 2.5k Vhr
where; Rhr = headroom setting resistor value, QPOout = the expected voltage on the QPO's output, Vhr = the target headroom voltage determined from the product data sheet.
IMPORTANT NOTE: When connecting the Rsc resistor into the EVAL1 board note the pad landing for the Rsc resistor that is adjacent to the VIA hole that also connects to CESR's lower pad. The resistor must be connected/soldered to that VIA hole point to make proper connection to the circuit and not just to the resistor pad landing.
Picor Corporation * www.picorpower.com
QPO-1-EVAL1 Data Sheet Rev. 1.2 Page 3 of 4
The peak detector function is enabled on the evaluation board. Connecting a 0.1uF capacitor to the CP pads disables the peak detector if not desired for the application. The QPO's peak detector circuit will increase the headroom of the QPO by roughly half of the peak-to-peak ripple on the QPO's input. Excessive ripple with low voltage converters could create enough additional headroom to cause the converter's output to increase to the point where an over-voltage fault is created and the converter will shut down. Check the converter's OVP set point and select component values to keep the QPO headroom adjustment from reaching the OVP trip point. The slope adjust feature can be set to zero providing relatively constant headroom versus load using an Rsa of 100k. To improve efficiency of the filter the slope adjust feature can provide a specific reduction in headroom (slope adjust) over a desired current range. The user can optimize performance based on the expected variation in load current and the desired power dissipation range. The formula below should be used to calculate the Rsa value for the desired headroom slope versus current. If the peak detector is enabled, the peak of the ripple will be added back to the headroom at a given load condition.
Typical standard 1% values for the Rhr and Rsc resistors and the listed voltages QPOout Voltage 3.3V 5.0V 12.0V 15.0V 24.0V 28.0V Headroom Voltage 375mV 375mV 375mV 375mV 375mV 375mV Rhr Value 22k 33.2k 80.6k 100k 160k 187k Rsc Value1 2.67k 4.02k 9.76k 12.1k 19.6k 22.6k
Note1: These Rsc values are for a converter with a 1.23 Volt pre-trimmed reference and 1k Ohm input resistance on the SC/Trim.
Typical Value For Rsa Resistor and Typical Voltages QPOout Voltage Headroom Voltage Change (Slope=V) 150mV 150mV 150mV 150mV 150mV 150mV Rsa Value Load Current Change 10 A 10 A 10 A 10 A 10 A 10 A
3.3V 5.0V 12.0V 15.0V 24.0V 28.0V
8.25k 8.25k 8.25k 8.25k 8.25k 8.25k
RSA = 0.05(V/A) *
Iout * 2.5k Vhr
where: Iout = Maximum load current change Vhr= Change in headroom desired over the load range Rsa= Slope adjust resistor value
Ordering Information
Part Number QPO-1 EVAL1 Description Evaluation board for QPO-1
Vicor's comprehensive line of power solutions includes high-density AC-DC & DC-DC modules and accessory components, fully configurable AC-DC & DC-DC power supplies, and complete custom power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. No license is granted by implication or otherwise under any patent or patent rights of Vicor. Vicor components are not designed to be used in applications, such as life support systems, wherein a failure or malfunction could result in injury or death. All sales are subject to Vicor's Terms and Conditions of Sale, which are available upon request.
Specifications are subject to change without notice. Vicor Corporation 25 Frontage Road, Andover, MA, USA 01810 Tel: 800-735-6200 Fax: 978-475-6715
Picor Corporation * www.picorpower.com * QPO-1-EVAL1 Data Sheet
Email Vicor Express: vicorexp@vicr.com Technical Support: apps@vicr.com
P/N 26801 Rev. 1.2 7/04/10M

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