VICOR QPO-1B, QPO-1L Datasheet

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PRELIMINARY

Vicor Corp. Tel: [phone] Fax: [phone] QPO-1 Data Sheet Page 1 of 8

Parameter Rating Unit Notes

+In to –In 33 Vdc Continuous
+In to –In 40 Vdc 100ms
Load current 15 A Continuous
Maximum power dissipation 4 W
Operating temperature -20 to +85 °C Ambient

Package thermal resistance 50

°C/W

Free Air

Package thermal resistance TBD

°C/W

Optimum heat sinking

Storage temperature -40 to +125 °C

Features

• >20dB PARD attenuation from
50Hz to 500kHz

• Supports point of load regulation

• Peak ripple detector optimizes
performance automatically

• Significantly improves load
transient response

• Efficiency up to 98%

• User selectable performance
optimization

• 3-30Vdc operating range

• 10A rating

Product Highlights

Picor’s QPO-1 output ripple attenuator
System-in-a-Package (SiP) provides active
filtering to achieve greater than 20 dB
attenuation of periodic and random deviation
(PARD) over the frequency range of
50Hz to 500kHz.

The QPO-1 operates over a voltage range
of 3 to 30Vdc and is compatible with most
switching power supplies and converters.
The load is regulated by using remote
sensing or a reference type trim adjustment
feature as is commonly found on most
power supplies.

The QPO-1’s closed loop architecture
greatly improves load transient response
while ensuring steady-state precise point of
load voltage regulation. The QPO-1 is
available in surface mountable Land Grid
and Ball Grid Array terminations.

Data Sheet

QuietPower

TM

Output Ripple Attenuation SiP

Shown actual size:

1.0 x 1.0 x 0.2 in
25 x 25 x 5 mm

Absolute Maximum Ratings

Exceeding these parameters may result in permanent damage to the product

Part Numbering

Patents Pending

QPO - 1 L

L = Land Grid Array

B = Ball Grid Array

Vicor Corp. Tel: [phone] Fax: [phone] QPO-1 Data Sheet Page 2 of 8

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PRELIMINARY

QPO-1 SiP SPECIFICATIONS (-20°C to +100°C PCB Substrate temperature)

Electrical Characteristics

Electrical characteristics apply over the full operating range of input voltage, output power and PCB substrate temperature, unless
otherwise specified. All temperatures refer to the operating temperature at the interface of the PCB surface with proper reflow mounting of
QPO-1. The PCB surface must have sufficient area and heat via’s to the opposite side to achieve the optimum thermal resistance.

QPO-1 Output RHRValue (ohms)

3.0V 20k

5.0V 33.3k

12.0V 80k

15.0V 100k

24.0V 160k

28.0V 187k

Table 1—RHRcomputed values for VHR= 375mV @100mA.

Parameter Min Max Unit Notes

Operating current range 0.03 10 A There is no internal current limiting. The system must

be properly fused such that the current does not exceed
the absolute maximum rating of 15A. A minimum

current of 30mA is needed to maintain regulation.
Operating input voltage 3.0 30 Vdc Continuous
Transient output response Step load change rates <1A/µs

@ 2A step 50 mVp-p V

HR

=375mV @ 100mA, Input capacitance = 200µF

@ 10A step 50 mVp-p VHR=375mV @ 100mA, Input capacitance = 1500µF

V

HR

headroom voltage range

(1)

225 525 mV @ 100mA load with 100mVp-p ripple.

See Table 1 for headroom setting R

HR

resistor values.

QPO

OUT+VHR

must be set below converter over voltage trip.

Output noise 10 mVp-p Input PARD = 100mVp-p, 50Hz-500kHz

5 mVrms

SC output current accuracy

(2)

±1 % See Note 2 and Figure 2 for setting RSSvalue

ISC=VHR/ R

SS

QPO-1 bias current 60 mA
Power dissipation 4.0 W QPO

OUT

= 28V; Iout = 10A

V

HR

= 375mV @ 100mA

(without slope adjust or peak detection.)

(1)

Headroom voltage, peak detection and slope adjustment must be chosen by the user based on attenuation and efficiency requirements.
The functional description section explains how to optimize the configuration of the QPO-1 for the voltage source used. The headroom
voltage is the difference between the input and the output of the QPO-1 and is set by the selection of resistor R

HR

.

Calculate R

HR

as shown.

R

HR

= (

QPO

OUT

/ VHR)x 2.5k (see Table 1 for example values)

(2)

RSSresistor sets the correction current required to trim the source output up to accommodate the headroom of the QPO-1 when remote
sense is not used. This function will accommodate power supplies with positive reference based trim configuration.

R

SS

= R

IN

* VOUT

/ V

RPT

( If a converter is trimmed down use the resulting V

OUT

voltage in the formula for RSS)

Where: R

IN

= input resistance of the SC or Trim pin;

V

OUT

= source output voltage;

V

RPT

= SC or Trim pin pre-trimmed reference

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PRELIMINARY

Vicor Corp. Tel: [phone] Fax: [phone] QPO-1 Data Sheet Page 3 of 8

Application Notes

Figure 1—Typical Configuration using Remote Sensing

Figure 2—Typical Configuration using Trim Control

RHR

Cco

15uF

QPO

OUT

9

SLOPE ADJ

2

7

SC SET

6

CESR

5

8

10

17

VREF

3

GND

1

SC

16

PEAK

IN

15

14

18

13

QPO

IN

12

11

REFGND

4

GND

19

GND

20

QPO-1

RSA

Load

Cps*

Rps

+

–

{

{

10Ω

IN*

20k**

4.7uF**

1W

Module
+ OUT

+ Sense

– Sense

Module
– OUT

Tri m

C

SC

*

*Optional Component
See Description

**Required only for
engineering samples

Qp*

RHR

R

SS

Cco

15uF

SLOPE ADJ

2

SC SET

6

CESR

5

VREF

3

GND

1

SC

16

REFGND

4

GND

19

GND

20

QPO-1

RSA

Load

+

–

IN*

CSC*

Module
+ OUT

Tri m

Module
– OUT

QPO

OUT

9
7

8

10

17

PEAK

IN

15

14

18

13

QPO

IN

12

11

{

{

*Optional Component
See Description

20k**

4.7uF**

**Required only for
engineering samples

Functional Description

The QPO-1 is an active power filter that provides attenuation
of power supply output PARD. The measured attenuation
performance over frequency is shown in Figure 3 at output
voltage conditions of 3.3 and 28 Vdc. The user can select
and optimize the attenuation versus power dissipation by
setting the headroom voltage of the active loop.

The conditions in Figure 3 were measured with a low current
headroom setting of 375mV with approximately 100mV
peak-to-peak ripple voltage on the input to the QPO-1. The
remote sense circuit configuration was used as shown in
Figure 1 with the peak detector function enabled. Some
power supplies need to sense the output ripple for proper
operation. Cps couples the unfiltered ripple back to the sense
input while Rps provides the DC feedback to the power
supply from the load.

Typical improvement in output noise and transient
performance with a 3.3V converter is shown in Figure 4.
This measured data demonstrates the reduction in noise and
ripple at the output of the QPO-1 versus the source output as
well as the transient capability stepping from 1 to 10A
load current - the maximum current rating. This particular
converter has sufficient output capacitance and response
time to load changes such that no additional capacitance,C

IN,

is needed on the input of the QPO-1 to reach a 10A level and
still maintain the output within ±50mV.

Ch1: QPO

IN

Ch4: QPO

OUT

Ch3: Load Current – 10A peak, pulse width = 400µS
Load Current Static = 1A

Load Current Transient = 9A
Headroom Voltage @ 100mA = 400mV

Attenuation VS Frequency

-70

-60

-50

-40

-30

-20

-10

0

1.00E+02 1.00E+03 1.00E+04 1.00E+05 1.00E+06

Frequency (Hz)

Attenuation (dB)

28V 10A

3.3V 10A

Figure 3— Attenuation vs. Frequency

Figure 4 – Transient Response using a Vicor

3.3V Half Brick Converter