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PRELIMINARY
(R)
QPI-8L
QuietPower TM
AdvancedTCATM Hot-Swap SiP With Active EMI Filter
Description
The QPI-8 is the industry's first System-in-a-Package (SiP) designed to integrate a total Hot-Swap function with an active EMI filter. The product aligns with the AdvancedTCA TM PICMG (R) 3.0 requirements for hot insertion and board level conducted noise limitations. The EMI filter provides active conducted common-mode (CM) and differential-mode (DM) noise attenuation from 150 kHz to 30 MHz. The QPI-8 is designed for use on a 48 or 60 Volt DC bus (36 - 76 Vdc). The in-rush current limit and circuit breaker are designed to satisfy the 200 W per board PICMG (R) 3.0 limit up to 70C PCB temperature around the QPI-8. The undervoltage and overvoltage thresholds can be trimmed separately via the UVEN and OV inputs using external series resistors. The Powergood active-high output provides opto-coupler drive for a converter's active-low enable (see Figure 9a) or active-high by connecting the diode in series with the Powergood output (see Figure 9b). The QPI-8 is available in a 1.0" x 1.0" x 0.2" SiP (System-ina-Package) with LGA mounting. QPI-EVAL1 kits are available with a mounted QPI-8 and screw terminals for easy insertion and testing. For more information on Evaluation Boards visit us online at picorpower.com.
Features
* >40 dB CM attenuation at 250 kHz * >70 dB DM attenuation at 250 kHz * 80 Vdc (max input) * 100 Vdc surge 100 ms * 1,500 Vdc Hi-pot hold off to Shield Plane * -48 V and -60 V Telecom/ATCA BUS capability * Provides safe powered backplane board insertion * 6 A Breaker with delay plus 12 A limiter * 1.0" x 1.0" x 0.2" SiP (System-in-a-Package) * QPI-8L Land Grid Array (LGA) * -40 to +100C PCB temperature (see Figure 5) * Hot-Swap and filter combination saves space * Efficiency >99% * Connects between OR'ing diodes and power converter input hold-up capacitors * Patents pending
Application
* ATCA PICMG(R) 3.0 boards
Block Diagram
PWRGD OV UVEN BUS+ QPI-8
BUS+ QPI+
Typical Attenuation
PowerGood
QPI+
Hot Swap Function
EMI Filter
SHIELD
BUSSW
SW
QPI-
QPI-
SHIELD
Figure 1 - Block diagram, EMI filter and Hot-Swap
Figure 2 - QPI-8 network analyzer attenuation curves
Picor Corporation * www.picorpower.com
QPI-8L Data Sheet Rev. 1.0 Page 1 of 8
PRELIMINARY
Absolute Maximum Ratings - Exceeding these parameters may result in permanent damage to the product.
Pins BUS+, SW, PWRGD to BUSBUS+, SW, PWRGD to BUSBUS+/BUS- to Shield QPI+ to QPIPackage Package Package Package Package Package Package All pins Parameter Input voltage Input voltage BUS inputs to shield hi-pot Load current Power dissipation Operating temperature Thermal resistance ja Junction temperature Thermal resistance Storage temperature Re-flow temperature ESD Notes Continuous 100 ms transient Pulsed limit @ 25C @ 25C PCB to QPI Interface Free Air Tb = 100C; Pd = 4 W @15 C/W PCB layout dependent (Note 1) 20 s exposure HBM Min -0.5 Typ Max 80 100 +/-1500 4.0 100 50 160 15 125 212 +/-2 Units Vdc Vdc Vdc Adc W C C/W C C/W C C kV
12 -40
-40
Note 1: Refer to Figure 15 and QPI application note QPI-AN1 for critical PCB layout guidelines to achieve this thermal resistance when reflowed onto the PCB.
Electrical Characteristics - Parameter limits apply over the operating temp. range unless otherwise noted.
Symbol Vb+bV+oi V-oi CMA DMA I BUS+ to BUSIPG QPI+ to QPIUV UVHYS OV OVHYS PWGSAT PWGLK Parameter BUS+ to BUS- input range BUS+ to QPI+ voltage drop BUS- to QPI- voltage drop Common-mode attenuation Differential-mode attenuation Input bias current at 80 Volts Load current prior to PWRGD Undervoltage threshold rising Undervoltage hysteresis falling Overvoltage threshold rising Overvoltage hysteresis falling Powergood low voltage Powergood high leakage Notes Measured at ILoad = 5 A (Note 2) Measured at ILoad = 5 A @ 100C (Note 2) Measured at ILoad = 5 A @ 100C (Note 2) VBUS = 48 V; Frequency = 250 kHz VBUS = 48 V; Frequency = 250 kHz Input current from BUS+ to BUSCritical maximum DC load Controller disabled to enabled Controller enabled to disabled Controller enabled to disabled Controller disabled to enabled IPWG = 1 mA VPWG = 90 V Min UV Typ 100 250 45 75 15 25 34 UV - 2 V 76 OV - 4 V 0.2 1 Max 80 Units Vdc mVdc mVdc dB dB mA mA V V V V V A
0.6
Note 2: Refer to Figure 5 for current derating curve.
Pin Descriptions
Pin 1, 16 2, 3, 15 4 Name BUSSW SHIELD Description Negative bus potential Negative rail controlled by hot insertion function. Shield connects to the converter shield and Y-capacitor common point via RY. See Figures 9a and 9b. Negative input to the converter Positive input to the converter Open collector output that asserts low when power is NOT good. Positive bus potential High side of UV resistor divider High side of OV resistor divider No connection
SiP Package Outline (bottom view)
NC PWRGD OV BUS+
9
QPI+
10
11
12 13
BUS+
8 7 6
QPI 8 SIP Package (Bottom View)
5, 6 7, 8 10 12, 13 14 11 9
QPIQPI+ PWRGD BUS+ UVEN OV Not used
14 15 16
UVEN
SW
QPI-
5 4
SHIELD
BUS-
3
SW
2
1
BUS-
Picor Corporation * www.picorpower.com
QPI-8L Data Sheet Rev. 1.0 Page 2 of 8
PRELIMINARY
Applications - EMI
The QPI-8 is an active EMI filter providing conducted common-mode and differential-mode attenuation from 150 kHz to 30 MHz. Designed for the telecom and ITE bus range, the QPI supports the PICMG(R) 3.0 specification for filtering system boards to the EN 55022 Class B limit. The QPI-8 attenuates conducted noise and provides the Hot-Swap function required in redundant systems, minimizing design time compared to using discrete approaches while minimizing the uncertainty that the system will pass the compliance requirements. The plot in Figure 4 shows the effect of inserting a QPI-8 filter between the DC bus and the converter input under the same operating conditions as in Figure 3. The resulting plot shows the QPI-8 is effective in reducing the measured prefiltered total noise spectrum to well below the EN 55022 Quasi-peak detection limit. Using the Quasipeak detection measurement mode would result in lower amplitudes by the error factor this method introduces.
Applications - Hot-Swap
The QPI-8 6 Amp rating provides filtering for up to 288 Watts of power from a 48 V bus with a 70C PCB temperature. It is well suited for the 200 Watt per board limit in the PICMG (R) 3.0. The 1.0" x1.0" x 0.2" surface mount LGA package provides ease of manufacturing by eliminating through-hole assembly. The current derating curve shown in Figure 5 should be used when the PCB temperature that the QPI-8 is mounted to exceeds 70C.
8
QPI Differential Current (A)
6
Figure 3 - Conducted EMI profile of a DC-DC converter.
4
The plots in Figures 3 and 4 were taken using the standard 50/50H LISN and measurement conditions with the peak detection mode of the spectrum analyzer for a conducted EMI test. The results show the total noise spectrum for a particular converter and load compared to the CISPR22 EN 55022 Class B Quasi-peak detection limit.
2
0
0
10
20
30
40
50
60
70
80
90
100
PCB to QPI Interface Derating Curve Over Temperature (Deg. C)
Figure 5 - QPI-8 current derating curve over temperature.
The QPI-8 is designed to have an undervoltage range of 32 V to 34 V set points when the UVEN pin is tied directly to the BUS+ pin. The QPI-8 becomes enabled when the input voltage exceeds 34 V and continues to work down to 32 V before being disabled. The QPI-8 overvoltage range is designed to be 72 V to 76 V when the OV pin is tied directly to the BUS+ pin. The QPI-8 remains functioning until the input voltage surpasses 76 V, where the QPI-8 will shutdown until the input voltage falls below 72 V. External resistors can be added (see Figures 9a and 9b) to trim the UV and OV trip points higher. The graph in
Figure 4 - Conducted EMI profile of a DC-DC converter with QPI-8.
Figure 6 shows the trimming effect for a range of external series resistors. The equations in Figure 7 can be used to calculate the UV and OV thresholds.
Picor Corporation * www.picorpower.com
QPI-8L Data Sheet Rev. 1.0 Page 3 of 8
PRELIMINARY
90.00
OV-HI
80.00
OV-LO
70.00
Voltage
60.00 50.00 40.00 30.00 0 5000 10000 15000 20000 25000 30000
UV-HI UV-LO
Series Resistor
Figure 6 - Trimming UV/OV with external series resistor.
Figure 8 - 5ms BUS transient, 42 W load CH1: VBUS, CH3: PWRGD, CH4: Converter load current
To prevent the QPI-8 from going into a fault mode and deasserting the Powergood signal after the transient, the
UVENLO = 2.5 (RUVEN + 108450) 8450 UVENHI = 2.5 V + (RUVEN + 100 K) (316 A) OVLO = 2.5 V + (ROV + 200 K) (348 A) OVHI = 2.5 (ROV + 206800) 6800
converter's input capacitors must be sized so that they can be completely restored in the time of one 12 A current pulse, about 1 ms, and still maintain the required input current of the converter. If greater bulk capacitance is required for higher loads, then the circuit in Figure 9c could be used to slowly charge the capacitors. To reduce bulk capacitance and take advantage of the V2 energy relationship, a boost circuit with a switch-over function can be used to charge fewer bulk storage capacitors to a higher voltage.
Figure 7 - UVEN and OV resistor equations.
It is critical to keep the load current on the converter's input capacitor to less than 25 mA during the initial power-up phase. This limit is set by the current limit level and the duty cycle of the circuit breaker timer. Once Powergood has been asserted the full load can be enabled. An external capacitor CE, shown in Figures 9a and 9b, will provide the required UVEN hold-up filtering during the ATCA's 5 ms, zero-volt BUS transient requirement. Figure 8 shows the effects of CE during a BUS transient event. Using a 2.2 F CE capacitor and 1 mF of converter input capacitance will enable this circuit to support a 42 W load for the 5 ms transient. The Powergood state of the QPI-8 remains unchanged during this transient, allowing the converter to maintain its output power to the load.
Picor Corporation * www.picorpower.com
QPI-8L Data Sheet Rev. 1.0 Page 4 of 8
PRELIMINARY
PWRGD
75K 50K
ENABLE A ENABLE B
CE
ROV BUSRUVEN PCB plane under converter
UVEN BUS+
OV
PWRGD QPI+
CY
VIN+
VOUT+
CY
BUS SUPPLY
CB 47 F
CIN
QPI-8
SW BUSSHIELD QPI-
CONVERTER
ON/OFF VINVOUTCY RY CY
BUSPE
Figure 9a - Typical ATCA System with QPI-8 with active-low enable input (Refer to Figure 15 and QPI-AN1 application note for critical PCB layout guidelines)
PWRGD
75K
ENABLE A ENABLE B
CE
ROV RUVEN PCB plane under converter
UVEN BUS+
OV
PWRGD QPI+
CY
VIN+
VOUT+
CY
BUS SUPPLY
CB 47 F
CIN
QPI-8
SW BUSSHIELD QPI-
CONVERTER
ON/OFF VINVOUTCY RY CY
BUSPE
Figure 9b - Typical ATCA System with QPI-8 with active-high enable input (Refer to Figure 15 and QPI-AN1 application note for critical PCB layout guidelines)
BUS+
CHOLD-UP =
2* E 2 - VUVLO2) (VPT
RB
RC
CHOLD-UP
where: E = Hold-up energy VPT = Pre-transient voltage VUVLO = Converter's UV limit
PWRGD 20 V BUS -
Figure 9c - Powergood controlled, auxiliary bulk storage capacitor charging circuit.
Picor Corporation * www.picorpower.com
QPI-8L Data Sheet Rev. 1.0 Page 5 of 8
PRELIMINARY
Performance Waveforms
Start-up
The following oscilloscope pictures show the Hot-Swap BUS- current, QPI- to Bus- voltage and PWRGD (Powergood) to BUS- output voltage of the QPI-8 during operation. Figures 10 and 11 are the QPI-8's in-rush characteristics under two load capacitance conditions. After insertion, when the UVEN voltage exceeds 34 V the UV detection fault is cleared, the QPI-8 goes through a delay cycle (~15 ms) to allow for system de-bounce and stabilization. After this time, the QPI- to BUS- path is turned on and current is allowed to pass, monitored by the current sense function. Initially the current level exceeds the 6 A circuit breaker limit, the event timer starts and the Powergood state is not valid. The sense function and linear control loop will allow twice the circuit breaker current to pass. If the current does not drop below the circuit breaker level prior to reaching the timer limit, typically 275 s, the QPI- to BUS- path will open. The effective duty cycle under the current limit condition is approximately 1%. Once the load capacitors are fully charged to the input bus potential, the load condition falls below 6 A and the PWRGD pin is asserted high, providing that the bus supply is still within the UV and OV range.
Figure 10 - 470 F capacitor @ 48 V CH1: PWRGD, CH2: QPI- to BUS-, CH4: BUS- current
Transient Protection and Recovery
Figures 12 and 13 show the QPI-8's ability to handle low resistance shorts (<2 ) at the load terminals to emulate fast and slow blown fuse events. In Figure 12, the transient short is 2 seconds long and the QPI- to BUS- path is opened within 400 s of this occurrence. Figure 13 demonstrates the QPI-8's performance with a short circuit on its output. The QPI-8 remains in a low duty cycle mode until the short is removed, then restarts normally.
In Figure 10 a 470 F capacitor required roughly 170 ms to completely charge from a 48 V bus voltage. The QPI-8 can drive large amounts of bulk capacitance, as shown in Figure 11 with a 4700 F load capacitance. Under this condition the PWRGD signal takes about 8.7 seconds to go high after the UVEN input is pulled high upon the completed insertion of the board into the shelf. Figure 11's time-scale is too long to show the current pulses that charge the bulk capacitance.
Figure 11 - 4700 F capacitor @ 72 V CH1: PWRGD, CH2: QPI- to BUS-, CH4: BUS- current
Figure 12 - 2 second short circuit CH1: PWRGD, CH2: QPI- to BUS-, CH4: BUS- current
Picor Corporation * www.picorpower.com
QPI-8L Data Sheet Rev. 1.0 Page 6 of 8
PRELIMINARY
0.1773
45.000 0.0625 0.0820
0.9843 0.8000
0.492 0.441 0.400 0.300
QPI-8 SIP Package
14 places
0.100
0.0820 R0.0410 0.0820
(Bottom View)
0.9843
0.000 0.100 0.300 0.400 0.441 0.492 0.300 0.100 0.000 0.100 0.300 0.441 0.492 0.492 0.441
0.1250
0.0200
Figure 13 - Start-up into short circuit CH1: PWRGD, CH2: QPI- to BUS-, CH4: BUS- current
Figure 14 - LGA Pad, package height and pad location dimensions in inches.
QPI-8 PCB Layout Considerations
For optimal QPI-8 filtering performance, care must be taken when routing the signal paths of RY (see Figures 9a and 9b) and the shield connections on the PC board. The RY resistor must connect between the converter's shield plane and the shield pin of the QPI-8. The connection to the chassis or protective earth, if required, should be taken directly from the QPI-8 shield pin as shown in Figures 9a and 9b. Figure 15 shows how this can be accomplished by using the QPI-8's shield pin to bridge the connection between RY and PE without allowing any parasitic paths that might circumvent the QPI-8 and degrade filtering performance. Reference can be made to the QPI-AN1 application note for critical PCB layout recommendations regarding filter performance, but use the QPI-8 pin/pad locations. Some systems may require the converter's positive or negative input or output 'terminal' to be connected to PE (Protective Earth) ground for safety or other considerations. When using the QPI in this situation this 'terminal' must be connected to the converter shield plane created in the PCB layout under the converter. Because the PE path may pass excessive current under a fault condition the resistance of this path may be limited to a low resistance value. To meet the resistance requirement without degrading filter performance RY can be replaced by a 4.7 H inductor rated for the fault current condition maintaining low power dissipation during a fault until the protection device clears. The shield return PCB traces must be sized to handle this current as well.
0.300 0.397 0.485
PWRGD OV NC BUS+
0.4410 0.4410
QPI+
SHIELD PLANE UNDER CONVERTER
UVEN SW QPIBUSRY SHIELD
Figure 15 - Recommended PCB layout pattern.
QPI Package Outline
0.485 0.441 0.397 0.300
14 places
0.0880
QPI PCB Pad Pattern (Top View)
0.492
R0.0440
0.100 0.000 0.100
2 places
0.0440 0.0440
0.0655
0.0880 0.485 0.441 0.397 0.300 0.100 0.000 0.100 0.300 0.397 0.441 0.485 0.1310
Figure 16 - Recommended PCB receiving footprint.
Ordering Information
Part Number QPI-8L Description QPI-8, Land Grid Array Package
Picor Corporation * www.picorpower.com
QPI-8L Data Sheet Rev. 1.0 Page 7 of 8
PRELIMINARY
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 * QPI-8L Data Sheet
P/N 30329
Rev. 1.0
6/05

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