QUIETPOWER datasheet(2/8 Pages) VICOR

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Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715

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

RHR Value (ohms)

3.0V

20k

5.0V

33.3k

12.0V

80k

15.0V

100k

24.0V

160k

28.0V

187k

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

Parameter

Min

Max

Unit

Notes

Operating current range

0.03

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

Vdc

Continuous

Transient output response

Step load change rates <1A/µs

@ 2A step

mVp-p

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

@ 10A step

mVp-p

VHR=375mV @ 100mA, Input capacitance = 1500µF

VHR headroom voltage range

(1)

225

525

@ 100mA load with 100mVp-p ripple.

See Table 1 for headroom setting RHR resistor values.

QPOOUT +VHR must be set below converter over voltage trip.

Output noise

mVp-p

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

mVrms

SC output current accuracy(2)

±1

See Note 2 and Figure 2 for setting RSS value

ISC=VHR / RSS

QPO-1 bias current

Power dissipation

4.0

QPOOUT = 28V; Iout = 10A

VHR = 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 RHR.

Calculate RHR as shown.

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

(2) RSS resistor 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.

RSS = RIN * VOUT / VRPT ( If a converter is trimmed down use the resulting VOUT voltage in the formula for RSS)

Where:

RIN = input resistance of the SC or Trim pin;

VOUT = source output voltage;

VRPT = SC or Trim pin pre-trimmed reference

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