MICRORAM datasheet(2/8 Pages) VICOR

2 / 8 page

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

MicroRAM Data Sheet

Rev. 1.1

Page 2 of 8

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PRELIMINARY

Parameter

Min

Typ

Max

Unit

Notes

Operating current range

No internal current limiting. Converter input must be

µRAM2xxx

0.02

properly fused such that the µRAM output current

µRAM3xxx

0.02

does not exceed the maximum operating current

rating by more than 30% under a steady state condition.

Operating input voltage

3.0

Vdc

Continuous

Transient output response

mVp-p

Step load change;

Load current step <1A/µsec

see Figures 9, 12, & 15, pp. 6-7

Transient output response

Optional capacitance CTRAN can be used

Load current step <1A/µsec

mVp-p

to increase transient current capability; See Figures

(CTRAN = 820µF)

1 & 2 on p. 3 and Figures 10, 13, & 16 on pp. 6-7

VHR headroom voltage range(1)

See Figures 5, 6 & 7

@ 1A load

325

425

See Table 1 for headroom setting resistor values

Output ripple

mVp-p

Ripple frequency 60Hz to 100kHz; optional capacitor

Input Vp-p = 100mV

mVrms

CHR = 100µF required to increase low frequency

attenuation as shown in Figures 3a and 3b

see Figures 8, 11, & 14, pp. 6-7

Output ripple

mVp-p

Ripple frequency 100kHz to 2MHz;

Input Vp-p = 500mV

mVrms

see Figures 8, 11, & 14, pp. 6-7

SC output voltage(2)

1.23

Vdc

See Table 1 RSC value

OR’ing threshold

Vin – Vout

µRAM bias current

Power Dissipation

µRAM2xxx VHR = 380mV@1A

7.5

Vin = 28V; Iout = 20A

µRAM3xxx VHR = 380mV@1A

11.5

Vin = 28V; Iout = 30A

µRAM MODULE SPECIFICATIONS (-20°C to +100°C baseplate temperature)

Electrical Characteristics

Electrical characteristics apply over the full operating range of input voltage, output power and baseplate temperature, unless

otherwise specified. All temperatures refer to the operating temperature at the center of the baseplate.

(1) Headroom is the voltage difference between the +Input and +Output pins.

RHR = (µRAM +Out/VHR) x 2.3k (see Table 1 for example values)

(2) SC resistor is required to trim the converter output up to accommodate the headroom of the µRAM module when remote sense

is not used. This feature can only be used when the trim reference of the converter is in the 1.21 to 1.25 Volt range.

(see Table 1 with calculated RSC resistor values)

RSC = ((µRAM +Out)/1.23V x 1k) – 2k

µRAM Out

3.0V

5.0V

12.0V

15.0V

24.0V

28.0V

VHR @ 1A

375mV

RHR Value (ohms)

18.4k

30.6k

73.6k

92.0k

147.2k

171.7k

RSC Value (ohms)

0.439k

2.07k

7.76k

10.20k

17.50k

20.76k

Table 1—RHR and RSC are computed values for a 375mV case. To compute different headroom voltages, or for standard resistor

values and tolerances, use Notes 1 and 2.

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