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QPO-2L
QuietPower TM
QPO-2L Low Voltage Output Ripple Attenuator
Description
The QPO-2 output ripple attenuator SiP uses active filtering to reduce supply output ripple and noise (PARD) by over 30dB from 1kHz to 500kHz. The QPO-2 is biased through the VAUX input and filters an input voltage range of 0.3VDC to 5.5VDC while supporting load currents as high as 20A. The VAUX input range is 7V to 12V with a minimum required difference between VAUX and QPO OUT of 7V. Output regulation is maintained by using either the remote sense or the trim adjustment of the power supply. The product can be used in an open loop configuration when ripple and noise reduction are the main objective and load regulation is not as critical. The QPO-2 architecture improves transient response and ensures quiet point-of-load regulation when used with most switching power supplies. The performance waveform in figure 2 is an example of the ripple reduction and transient load improvement the QPO-2 can provide using a 3.3V brick style converter.
Features of the QPO-2
* >30 dB PARD attenuation, 1kHz to 500kHz * >20 dB PARD attenuation, 50Hz to 500Hz (1) * 20A rating over a 0.3-5.5Vdc operating range * Supports precise point-of load regulation * 90-95% efficiency with load vs. headroom trim * User selectable performance optimization of the attenuation, power dissipation & transient load response * Peak detector function optimizes headroom for ripple amplitude variation automatically * 25 x 25 x 4.5 mm SiP with LGA mounting * Closed loop control improves transient response of most DC/DC converters and power supplies * Reduces required number of output capacitors to support dynamic loads. * Patents Pending
Applications
* * * Distributed Point of Load Power Systems Sensors Requiring Low Noise Power Medical Instrumentation
Note 1: For off-line supplies 20dB attenuation can be achieved down to 50Hz with additional capacitance added from the VREF pin to REFGND.
Typical Application
VAUX
VAUX
QPO-2 Performance
QPO IN (AC)
LOAD+
QPO OUT
VOUT+
CIN*
QPO IN PEAK IN
SENSE+ +TRIM
RSL
RCP
RCLAMP ADJUST GND
QPO-2L
SC SET REFGND SLOPE ADJ
Rsc
QPO OUT (AC)
VREF
CSC
RSA
LOAD CURRENT
RHR
SENSEVOUT*Optional
LOAD-
Figure 1 - ADJUST/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-2L Data Sheet Rev. 1.1 Page 1 of 12
Absolute Maximum Ratings - Exceeding these parameters may result in permanent damage to the product.
Pins VAUX to Gnd All others to Gnd REFGND VAUX to Gnd QPOin to QPOout Package Package Package Package Package Package Parameter Input voltage Input voltage Input bias current Input to output current Power Dissipation Operating Temperature Thermal Resistance Thermal Resistance Storage Temperature Re-flow Temperature Notes Continuous Continuous 10 seconds @ 25C Pd= ILoad x Vhr PCB to QPO Interface Free Air PCB Layout Fig. 12 20 second exposure @ Min -0.5 -.05 Max 13.2 6 50 25 4 100 Units Vdc Vdc mAdc Adc W C C/W C/W C C
-40 50 12 -40
125 212
Electrical Characteristics - Parameter limits apply over the operating temp. range unless otherwise noted.
Symbol ILoad VQPOOUT VHR IAUX Vtout Vnout Iscout Iscout Parameter Operating Load Current Range Output Voltage Range Headroom Voltage Range VAUX input current Transient Response-step load change of 10A@<1A/usec Output Noise SC Output Current Accuracy SC Output Source Current Notes No Internal Current Limit (2) Continuous See Applications Detail For Setting Vhr=375mV Cin=200uF Iload=1A @ t=0 See figure 2 example Input PARD=100mVpp 50-500kHz Cvref=25uF See Applications Detail For Setting Input current from QPOIN to Gnd Min 0.01 (3) 0.3 75 10 50 10 5 +2 10 Max 20 5.5 425 20 Units Adc Vdc mVdc mA mVdc mVpp mVrms % mA
-2
Note 2: User must protect the load path and limit the steady state load current to be less than the absolute maximum of 20 Amps. Note 3: User must provide a minimum load current of greater than 10mA at the output of the QPO-2.
RCLAMP
VAUX
LGA Pattern
QPO-2: (bottom view)
11 12 13
QPO IN
9 8
QPO OUT
10
7 6
17
18
14 15 16
PEAK IN ADJUST
20 4
REFGND
19 3
VREF
SC SET
5 2
SLOPE ADJ
1
GND
GND SLOPE ADJ VREF REFGND SC SET QPO OUT VAUX RCLAMP QPO IN PEAK IN ADJUST
1,19,20 2 3 4 5 6,7,8,17 9 10 11,12,13,14,18 15 16
Pad Designations
Pad Description
GND Input ground QPOOUT VAUX RCLAMP QPOIN Output pins Input bias voltage External resistor to program VREF quick-charge level at start-up Input pins (critical thermal path to remove heat from the package, see PCB suggested layout Fig.13) Ripple Peak Detector Input A current source that mirrors the current through RSC and drives a converter's SC/TRIM pin.
QPO-2L Data Sheet Rev. 1.1 Page 2 of 12
SLOPE ADJ RSA resistor connection allows setting of the slope of headroom voltage vs. load (mV/A) VREF REFGND SC SET Input to the active filter, setting the output voltage at the QPOOUT pins Ground reference for the VREF pin (critical low noise connection) Rsc resistor connection allows setting of the SC/trim current applied to the converter trim input.
PEAK IN ADJUST
Picor Corporation * www.picorpower.com
Product Highlights
Picor's QPO-2, System-in-a-Package (SiP) output ripple attenuator, is easy to apply and provides the user with features that can be tailored to optimize the product's performance to meet their system needs. It uses active filtering to achieve greater than 30 dB of attenuation of Periodic And Random Deviation (PARD) over the frequency range of 1kHz to 500kHz. For converters running off-line with greater low frequency output ripple, the attenuation can be extended to be greater than 20dB down at 50Hz by connecting a 25uF capacitor between the VREF and REFGRD pins. The QPO-2 operates over an output voltage range of 0.3 to 5.5Vdc and requires an external input bias voltage of 7 volts above the QPO output for proper operation. It is compatible with most switching power supplies and converters and regulates the output load by using either a converter's remote sensing feature or the SC/trim function of the QPO-2 with the converter. The SC/Trim feature will correct the converter's output voltage to compensate for the headroom voltage drop of the filter if remote sensing is not available or not preferred. The QPO-2 SC function works with converters that feature a positive reference trim adjustment by sourcing correction current into the trim reference pins commonly found on many power supplies. The QPO2 can also be used when remote sense or SC/trim is not possible. In this mode of operation the QPO-2 will still provide greater than 30dB of ripple and noise attenuation but DC errors will not be corrected for once the converter and headroom voltages are set, resulting in reduced load and transient performance. The QPO-2's closed loop architecture greatly improves load transient response of the converter while ensuring steady-state precise point of load voltage regulation. The headroom setting of the filter dramatically reduces the capacitance needed at the converter output to provide the equivalent transient performance and ripple reduction. Figure 2 demonstrates how the product can be an ideal solution for noise sensitive applications providing ripple and noise reduction and improved output regulation with high current transient load demands.
Functional Description
The QPO-2 is an active power filter that provides conducted differential attenuation of power supply output PARD. It is design to be inserted between the output of the supply and the load, providing closed loop regulation through remote sensing or by means of the SC/Trim feature of supplies having a positive referenced based trim capability and is set by RSC. The core of the design is a high bandwidth closed loop function that forces the QPOOUT pins to be equal to the VREF pin. The VREF pin is a filtered ratio metric representation of the input voltage that is determined by the RHR value selection. The voltage difference between the input to the QPO-2 and VREF pin is defined as the headroom voltage VHR. The filter time constant of the VREF pin determines the low frequency attenuation response of the QPO-2. The high frequency attenuation response is determined by the roll-off characteristics of the active loop. To speed up the charging of the Vref pin the RCP resistor can be used to clamp the pin just below the steady state regulation point avoiding excessive delay and headroom during start-up. The QPO-2 has a current sensing function that creates a voltage at the Slope Adjust pin that is proportional with the load current. This feature can be used to improve the efficiency of the filter when supply ripple amplitude reduces with increasing load as with Vicor products. By selecting the appropriate RSA resistor value the slope of the headroom reduction versus load can be set. The effect of this function is to reduce the headroom voltage by the amount determined by the RSA value resulting in reduced power dissipation and increased efficiency as compared to a fixed headroom setting. There is also a Peak Detection function that adds the input peak of the ripple voltage to the headroom voltage. The QPO-2 will track the input ripple adjusting the headroom within the dynamic range of the filter as the peak of the ripple changes. The peak of the ripple will automatically be summed with the DC setting of the headroom voltage. This feature in combination with the slope adjust feature allows the user to optimize the initial headroom voltage and overall efficiency required for their specific application.
Picor Corporation * www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 3 of 12
Remote Sense Application Circuit Schematic
VOUT+
RRS 5.1 RCP
VAUX
10 9 17 8 7 6 5 RCLAMP VAUX 11 12 QPO OUT 13 QPO IN 14 18 PEAK IN 15 QPO-2L SC SET 16 ADJUST
LOAD+
SENSE+
CRS 22F
}
{
SC/TRIM
CIN* Csc*
SLOPE ADJ
19
GND GND 20 GND 1
REFGND
VREF 3
2
4
SENSERSA RHR
VOUT* Optional
LOAD-
Bold lines indicate high-current path.
Figure 3 - Use this circuit for applications requiring remote sensing. Components marked * are optional, see text.
SC/Trim Application Circuit Schematic
LOAD+ VOUT+
18 17
SENSE+
Cin*
Rsl
+TRIM
Csc
18 QPO IN QPO OUT 11 12 QPO OUT QPO IN 13 14 15 PEAK IN QPO-2L 16 ADJUST SC SET 19 GND
Rsc
17 8 7 6
}
{
5
SLOPE ADJ
REFGND
VREF
20
GND
1
GND
2
3
4
SENSEVOUT* Optional
Rsa
Rhr
LOAD-
Bold lines indicate high-current path.
Figure 4 - Simplest application of QPO-2 when the SC/Trim pin is available, see text.
Picor Corporation * www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 4 of 12
Application of the QPO-2
This product can be used over a 0.3VDC to 5.5VDC output voltage range using either the remote sense or the voltage trim feature of the selected converter. These circuit configurations are shown in Figures 3 and 4. In either configuration, the source output voltage will increase to accommodate the headroom voltage of the QPO-2 filter in order to maintain the load voltage at the required level. In the case where remote sense or SC/Trim use is not possible the QPO-2 can still be used to provide PARD attenuation with the DC loss of the headroom voltage at the load. If the supply output can be trimmed up, the headroom voltage drop of the QPO-2 can be compensated for at a given load. Further DC correction for load variation at the QPO2 output will occur only within the supply's control loop. The QPO-2's output will be controlled to the voltage present at the VREF pin in this open loop filter configuration. The user must decide on the control mode to be used and to select the appropriate circuit configuration for that mode. They must take into consideration the effects of the headroom setting and power dissipation versus PARD attenuation. The majority of the power dissipation of the QPO-2 is the product of the headroom voltage times the load current and must always be less than 4 watts. The dynamic headroom range of the QPO-2 is 75mv to 425mv as long as the maximum power is not exceeded. It is important that the user understands the range of expected ripple and transient performance of their power source to properly bias and utilize the QPO features. The objective is to maximize attenuation and minimize dissipation while staying within the QPO-2 dynamic operating range. Knowing the worse case maximum steady state ripple, output impedance and transient response time of the power source will determine the minimum required headroom of the QPO-2, which is set by the value of RHR. See figure 5 below for the safe operating power curve.
If the peak detector option is enabled the headroom will automatically increase by the peak of the ripple amplitude from the setting determined by RHR. This makes the initial headroom setting less critical because the headroom and dynamic range will track the peak of the ripple, maintaining the required QPO-2 biasing to actively attenuate. Caution must be taken such that the added peak detection headroom does not cause power dissipation in excess of 4 watts. The time constant of this feature is roughly 30ms in response to ripple amplitude changes. This feature can be enabled by connecting the PEAKIN pin to the QPOIN pins and disabled by putting a resistor between QPOIN and the PEAKIN pin as shown in Figure 6.
VOUT 1K
QPO-1 IN
PEAK IN 0.1uF
Figure 6 - Peak detect disable circuit.
Conversely the optional slope adjust feature will reduce the headroom proportional to load current depending on the RSA value selected. This will reduce the maximum ripple range so this feature is most useful when the converter ripple amplitude decreases with increased load current. The feature can be enabled by selecting the proper RSA value as described in the headroom slope adjust section of the datasheet and effectively disabled by using RSA = 100K. Figure 7 shows the relationship of the headroom voltage versus attenuation of the QPO-2 for a 3.3 volt output with a 15 amp load. This relationship is relatively constant over the full output voltage rating of the product so this graph can be used for the 0.3V to 5.5V range when selecting the headroom voltage. The value of headroom resistor will be dependent on desired output and headroom voltages. The selection of the final headroom voltage should be based on the maximum expected ripple, desired attenuation, based on the curves in figure 7, and the transient response time of the converter. Formulas for SC current setting resistor, RSC and the RCP clamp setting resistor, are provided in their respective sections. The headroom range indicated in figure 7 shows that increasing the
QPO-2L Data Sheet Rev. 1.1 Page 5 of 12
450 400 350 300 250 200 150 100 50 0 0 2 4 6 8 10 12 14 16 18 20 Output Current (Amps)
Figure 5 - Safe operating power curve. Picor Corporation * www.picorpower.com
Maximum Headroom Voltage (mVolts)
headroom voltage will increase the attenuation, up to a point of diminishing returns, over the range of 10kHz to over 1Mhz. With an external 25uF capacitor connected between the VREF and REFGND pins the low frequency attenuation from 10Hz to 10kHz will reduce by roughly 10dB. Review the following transient considerations below before selecting the operating headroom. The RHR resistor value is determined by using the following formula.
Rhr =
QPOout * 2.5 k Vhr +15mV
To ensure sufficient headroom during transient load changes, a greater headroom voltage than what would normally be set based on maximum ripple should be considered. To provide margin to cover the instantaneous drop in the converter output and the line drops, additional headroom will be needed. In the example shown in figure 2 an additional 75mV was included with the headroom voltage value selected from the graph in figure 7 to cover the instantaneous drop in the supply output during the 10 Amp step as explained below. In Figure 2, a maximum load of 10 Amps allowed for the RHR value to be calculated to provide 375mV of headroom to avoid exceeding 4 Watts. In this example, based on the attenuation graph in Figure 7, 300mV of headroom is the point of diminishing returns so the maximum attenuation would be achieved at the fundamental ripple frequency. To stay within the dynamic range required by the active loop during a transient, a total of 375mV was used in the formula to determine the RHR resistor value. The peak detector will dynamically add 30mV (derived from the 60mV peak to peak input ripple) to the static headroom setting providing the total dynamic headroom of typically 405mV with the detector enabled. The input capacitance to the QPO-2 will provide the transient load current keeping the QPOOUT at the VREF voltage until the converter loop responds to regulate the load. During this time the transient load current capability can be approximated by the formula below. The capacitance CIN may be within the power supply that is used or supplemented by external capacitance. Consideration of the power supply's sensitivity to additional output capacitance and stability must be understood before additional capacitance is added for transient performance enhancement.
where; RHR is headroom setting resistor value, QPOOUT is the expected voltage on the QPO's output, VHR is the target headroom voltage for the desired range of attenuation.
0
Rhr=43.2k (Vheadroom=159mV)
-20
37.4k (189mV) 33.2k (216mV)
-40 dB -60
-80
Vout=3.3V Iload=15A Rslope=100K
10 100 1K 10K Frequency [Hz]
31.6k (229mV) 27.4k (269mV)
-100 100K 1M 3M
Figure 7 - Attenuation curves without slope adjust.
0 -20 -40 dB -60 -80 -100
10 100 1K Vout=3.3V Iload=10A Rslope=8.2K W
Rhr=29.4k (Vheadroom=103mV) 27.4k (126mV) 26.1k (146mV)
23.7k (173mV) 22.1k (198mV) 10K 100K 1M 3M
I =
Vhr * Cin 2Tr
Figure 8 - . Attenuation Curves Using Slope Adjust Feature
where; CIN = Input capacitance (assuming low ESR/ceramic type) at the QPO-2 input, I = Step load current change, Tr = Converter response time, VHR = headroom voltage.
QPO-2L Data Sheet Rev. 1.1 Page 6 of 12
Picor Corporation * www.picorpower.com
The output voltage drop for a given supply during a transient load step will be reduced at the output of the QPO-2, effectively multiplying the CIN capacitance by the ratio of VIN/VOUT which is typically greater than a factor of 10. The line inductance from the output of the QPO-2 to the load should be minimized. This inductance will cause voltage spikes and ringing proportional to the inductance and the rate of change in the transient load current. This effect is outside the control of the QPO-2 and may require low ESR capacitance placed at the switching load when long lines exists between the QPO-2 output and reference ground and load. The rate of load change should be less than 1 Amp per microsecond to minimize excessive voltage ringing during the di/dt. The line inductance between the power supply output and QPO input should also follow low inductance layout practices. The user must be aware of the converter's overvoltage set point and not create a headroom voltage that will cause a shutdown condition. For this reason it is recommended that the QPO-2 be used with power supplies running at the factory pre-set voltages or in a trimmed down configuration.
Note 4: When applicable consider the equivalent impedance of the SC/Trim pin after a trimmed down adjustment has been made to the supply. Use the power supply manufacturer's trim down procedure by connecting a resistor from the SC/Trim pin to ground. The active loop performance of the QPO-2 has been optimized to provide adequate phase margin over a worse case load impedance range. Loading the QPO2 directly with low ESR ceramic capacitance however will significantly reduce the phase margin and is not recommended. The effects of the typical distributed inductance of the load path will mitigate the reduction in phase margin when low ESR ceramic capacitors are dispersed about the load path. Tantalum and Electrolytic capacitors are higher ESR components and are not a concern for phase margin. When using the QPO as shown in figure 4 the CSC capacitor creates a soft starting of the headroom correction current being sourced into the SC/Trim input of the converter, preventing the output from tripping the over voltage function while the QPO-2 output reaches regulation. The QPO-2 ramp up time is typically 5 to 10 milliseconds. The CSC value will be supply dependent but is typically around 1 to 10F. The RSL resistor provides a means to isolate the SC/Trim pin of the converter from CSC as well as limit the correction current to a level below what will cause an OVP trip condition during start up. The compliance of the SC output current source is QPOIN plus 10 volts so the RSL formula below can be used to limit the worst-case correction current below the maximum trim up specification of the converter being used. Note the correction current set by RSC must always be lower than the ISCMAX current after the start-up settling time interval for proper headroom correction.
SC/Trim Adjustment
The RSC resistor is tied between QPOOUT and SC SET pin and controls the correction current used to trim the converter to compensate for the headroom voltage. The value for the SC SET resistor is calculated by the following equation:
RSC =
RIN * VOUT VRPT
where; RSC is SC SET resistor value, RIN is the input resistance of the SC or TRIM input of the converter (4) VOUT is the desired QPO output voltage, VRPT is the pre-trimmed reference of the SC or TRIM. This feature can be used in conjunction with an initially trimmed down supply.
RSL =
QPOIN + 10V ISCMAX
Picor Corporation * www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 7 of 12
Headroom Slope Adjustment
This feature can be used to allow more headroom at lighter loads inceasing the delta voltage available to improve transient load capability, while approximating constant power dissipation of the QPO-2 over the full load range. The slope of this curve is set by the slope adjust resistor RSA. Figure 9 shows the relationship of headroom resistance versus power dissipation for a load current of 10 Amps. The same data is plotted in Figure 10 with the slope adjust feature reducing the headroom by 150mV over the load range of 1 to 10A, for a typical range of RHR values with a 3.3 volt output. The headroom setting RHR value was selected at the minimum load condition while enabling the slope function using an RSA value of 8.2k. This feature is useful in improving the QPO-2 efficiency when using switching power supplies that have decreasing ripple with increasing load current, like Vicor converters. Figure 8 shows the headroom voltage vs. load with different headroom resistors with RSA =8.2k. The slope adjust feature can be effectively disabled, providing relatively constant headroom versus load, by using an RSA of 100k. 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 versus current slope. If the peak detector is enabled, the peak of the ripple will be added back to the headroom at a given load condition.
600mV
400mV
Rhr=64.9 k 75 k 82.5 k 93.1 k 102 k 113 k 124 k
V Headroom
200mV 0V
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A
Load Current (A)
Figure 8 - Effect of slope adjust on headroom value with increasing current and RSA = 8.2 k.
Figures 9 and 10 demonstrate the attenuation versus power dissipation relationship with different headroom resistor values with corresponding increasing power dissipation at a fixed 10A load. The low frequency attenuation is flat with changing headroom as indicated by the 50Hz line. The active attenuation is dependent on the headroom voltage and correlates to the attenuation curves presented previously.
0 -10 -20
500 khz
3.3 V QPO-2 output voltage 69.8 k Headroom resistor
dB
-30 -40 -50 -60
1
47.5 k
50 hz
39.2 k 30.1 k 24.9 k 21 k
2
3
4
Watts
Iload=10A (Vref Cap=25uF) 1% Rhr std. values for VOUT=3.3V Rsa=100k (delta Vhr=0mV from 0.1 to 10A)
RSA = 0.05(V/A) *
Iout * 2.5 k Vhr
Figure 9 - Power dissipation vs. RHR (Headroom voltage)
where: IOUT = Maximum load current change, VHR = Change in headroom desired over the load range, RSA = Slope adjust resistor value, Example: For a 5A maximum load and a 150mV reduction in headroom.
Figure 10 shows the increase in attenuation that can be gained by using the slope adjust feature setting higher headroom at lower loads while limiting the power dissipation with reduced headroom at higher loads staying within the 4 Watt limitation of the package. As stated previously this will also increase the transient capability with a load step providing more delta voltage across the filter at lower loads.
RSA = 0.05(V/I) *
5A * 2.5 k = 4.167 k 0.15 V
Picor Corporation * www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 8 of 12
0
The following is a summary of typical configurations that a user can select for the QPO-2.
3.3 V QPO-2 output voltage 27.4 k Headroom resistor
500 kHz 50 Hz
-10
-20 dB
-30
24.9 k
22.6k
-40
21 k 18.2 k 16.5 k 14.3 k
-50
-60 1 2 Watts 3 4
Iload=10A (VREF Cap=25F) 1% Rhr std. values for VOUT=3.3V Rsa=8.4K (delta Vhr=150mV from 0.1 to 10A)
o No slope adjust, no peak detect, fixed headroom, attenuation vs headroom graph in figure 7 apply o No slope adjust, peak detector enabled, headroom will increase by the peak of the ripple amplitude o Slope adjust enabled, no peak detect, headroom will decrease with the increase in load current o Slope adjust enabled, peak detector enabled, headroom will vary with ripple amplitude and load variations The attributes of these features have been explained in this datasheet. The optimum use of them requires an understanding of the characteristics of the power supply to be filtered.
Figure 10 - Power dissipation vs. RHR (Headroom voltage) with 150mV of slope adjust.
Headroom Start-up Clamp Feature
This feature allows for pre-charging the Vref capacitance to the level just below the steady state headroom voltage. It reduces the time for the QPOout to reach the desired regulation voltage and converter output overshoot that results in the delay through the QPO filter during start-up. The following formula can be used to calculate the RCP resistor value to set the clamp at 90% of the final output value. To set the clamp voltage to different percentages of the output substitute the 0.90 with the desired factor.
RCP = 100k* (VQPOIN - 0.90*VQPOOUT) 0.90*VQPOOUT
Picor Corporation * www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 9 of 12
QPO Package Outline
0.4850 0.4410 0.3970 0.3000 0.1500 0.1000 0.0000 0.1000 0.1500 0.3000 0.3970 0.4850 0.0880 0.4850 0.4410 0.3970 0.3000 0.2000 0.1000 0.0000 0.1000 0.2000 0.3000 0.3970 0.4410 0.4850 0.1310 0.492
4 places QPO PCB Pad Pattern (Top View)
0.2060
0.2560
15 places
0.0880
0.0655
Figure 11 - Recommended PCB receptor patterns. (dimensions in inches)
QPO IN
QPO OUT
0.4410
0.4410
Vias to ground plane
Figure 12 - Recommended PCB copper lands for low thermal resistance.
Picor Corporation * www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 10 of 12
0.325
0.2500 0.492 0.441 0.400 0.300 45.000
4 places
0.2000
QPO SIP Package
0.250
0.0625
0.100 0.000 0.050 0.000 0.050
0.0820
0.100
0.325
0.1773
0.075 0.000 0.075
0.300
0.250
(Bottom View)
15 places
0.0820 0.1250 0.0200
0.400 0.441 0.492
0.492 0.441
0.300
0.100
0.000
0.100
0.300
Figure 13 - Package dimensions (dimensions in inches)
Ordering Information
Part Number QPO-2L Description QPO-2 Land Grid Array
Picor Corporation * www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 11 of 12
0.400 0.441 0.492
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 L Data Sheet
P/N 29738
Rev. 1.1
4/05

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