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PRELIMINARY
(R)
QP0-2 EVAL1
QuietPower TM
converter. The RSL resistor shown in Figure 4 of the product datasheet (not on the evaluation board) can be used to limit the correction current sourced from the Adjust+ circuit if needed during start-up preventing the converter from tripping OVP. RHR is the headroom voltage setting resistor that will determine the voltage dropped across the QPO-2. The RSA1 resistor is for the slope-adjust option, which can be used to reduce the amount of voltage across the QPO-2 depending on load current. This reduced drop in voltage will result in a lower power loss across the QPO-2 providing greater efficiency but lower attenuation. An optional capacitor, CHR, can be added to extend the lowfrequency attenuation range of the QPO-2. The RP resistor connects the QPO-2's peak detection circuit to the input voltage rail. The peak detector will adapt the headroom voltage by adding half the peak-to-peak ripple voltage to the headroom. RP is required. The peak detection can be disabled adding a filter capacitor CP to the board. The full product datasheet with equations to calculate these component values plus more detailed explanations of their functions, can be found at www.picorpower.com.
Evaluation Board for QPO-2 Active Output Filter
The QPO-2-EVAL1 board provides an easy to use evaluation platform for testing the QPO-2L in a lowvoltage system. A filtered voltage range of 0.3 Vdc to 5.5 Vdc at output load currents up to 20A can be accomplished. A low current bias supply is required at the VAUX input in the range of 7 to 12 volts respectively to the output voltage range. The board comes with a QPO-2L and some essential external components pre-mounted. Please refer to the QPO- 2L datasheet for product details. Terminals for horizontal or vertical mounting are also provided. The user must select component values dependant upon their system needs. RCP will preset the QPO-2's reference voltage to a value close to the desired steady-state value. This reduces the time required for the QPO-2's output to reach the steadystate output voltage. There is a provision for a startup circuit (Q1 RDLY D1 CDLY) if the initial headroom voltage needs to start from zero and increase gradually to the set headroom voltage. Remote sense components (CRS RRS), Figure 3 of the product datasheet, are mounted on the evaluation board. When remote sensing is not used RSC1 is the current programming resistor that determines the current sourced by the QPO-2's Adjust+ pin to drive the TRIM pin of a
QPO_IN
J2 VAUX QPO_OUT
J6 QPO_IN RP
RCP
10 9 RCP/RON
Low Voltage Start-up Circuit
QPO_IN CRS 15 F J7 SENSE+ RRS 10 QPO_OUT D1 MA111 CDLY 0.1 F Q1 IRLML6401 J5 GND VREF J9 GND J10 GND RDLY 20 K J5 ADJUST/SC CP PEAKIN ADJUST
VAUX
11 12 13 14 18
QPO IN QPO IN QPO IN QPO IN QPO IN
QPO OUT QPO OUT QPO OUT QPO OUT SC SET
17 8 7 6 5 RSC1
J1 QPO_OUT
15 PEAK IN SLOPE ADJ 16 ADJUST+/GND 19 GND 20 GND
REFGND
QPO-2
1
2
VREF 3
4
RSA 1
RHR VREF
CHR J3 VREF
Figure 1 - Evaluation board schematic Picor Corporation * www.picorpower.com QPO-2 EVAL1 Data Sheet Rev. 1 Page 1 of 2
PRELIMINARY
1.800 0.150 1.500 0.442
1.800
1.350
0.300
0.300 0.200 0.200 0.200
Figure 2 - Figure 2 - Evaluation Board Layout
0.300 0.200 0.200 0.200
* Note: Components RSA2, RSC2, and RDN are not used in the QPO-2L evaluation. Components Q1, D1, RDLY and CDLY are for an optional start-up circuit.
Ordering Information
Part Number QPI-2 EVAL1 Description Evaluation board for QP2-1L
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
Email Vicor Express: vicorexp@vicr.com Technical Support: apps@vicr.com
Picor Corporation * www.picorpower.com * QPO-2 EVAL1 Data Sheet
P/N 30642
Rev. 1
8/05

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