BQ50120QTA25 datasheet(6/12 Pages) SYNQOR | Quarter-brick DC Bus Converter

6 page

Product # BQ50120QTA25

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2BQ512M Rev. C

03/17/06

Page 6

Input:

Output:

Current:

PPackage:

ackage:

42-53 V

12 V

25 A

Quarter-brick

Technical S

echnical Specification

pecification

Figure 12: Test set-up diagram showing measurement points for Input

Terminal Ripple Current (Figure 13), Input Reflected Ripple Current

(Figure 14) and Output Voltage Ripple (Figure 15).

10 µH

source

impedance

DC/DC

Converter

See Fig. 14

See Fig. 13

See Fig. 15

1 µF

ceramic

capacitor

15 µF,

450m

Ω ESR

tantalum

capacitor

47 µF,

Ω ESR

electrolytic

capacitor

VSOURCE

VOUT

Ambient Air Temperature (

oC)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

50 LFM (0.25 m/s)

Figure 7: Maximum output power derating curves vs. ambient air tem-

perature for airflow rates of 50 LFM through 400 LFM with air flowing

from input to output (nominal input voltage).

Figure 8: Thermal plot of converter at 25 amp load current (300W)

with 55°C air flowing at the rate of 200 LFM. Air is flowing across the

converter from input to output (nominal input voltage).

Figure 9: Turn-on transient at full load (resistive load) (100

µs/div).

Ch 1: Vout (5V/div)

Figure 10: Turn-on transient at zero load (100

µs/div). Ch 1: Vout

(5V/div)

Figure 11: Output voltage response to step-change in load current (50%-75%-

50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 15µF, 100 m

Ω

ESR tantalum cap

and 1µF ceramic cap. Top trace: Vout (200mV/div), Bottom trace: Iout (5A/div).

Semiconductor junction temperature is

within 1°C of surface temperature

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