Input:

40-65 V

Output:

12 V

Current:

67A

Package:

Quarter-brick

Product # BQ57120QZB67

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-0006523 Rev. B

05/12/15

Page 7

Input:

40-65 V

Output:

12 V

Current:

67A

Package:

Quarter-brick

0

10

20

30

40

50

60

70

25

40

50

60

70

85

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)

0

100

200

300

400

500

600

700

800

25

40

50

60

70

85

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)

Figure 7: Max output power derating curves vs. ambient air temperature for

airflow rates of 100 LFM through 400 LFM with air flowing across the converter

from output to input (nominal input voltage).

Figure 8: Thermal plot of converter at 38.3 A load current (389 W) with 55 °C

air flowing at the rate of 200 LFM. Air is flowing across the converter from

output to input (nominal input voltage).

Figure 9: Turn-on transient at 50% load (resistive load) (5 ms/div). Load cap:

5 mF output capacitance. Input voltage pre-applied. Ch 1: Vout (2 V/div), Ch 2:

ON/OFF input (2 V/div).

Figure 10: Turn-on transient at zero load (5 ms/div). Load cap: 5 mF output

capacitance. Ch 1: Vout (2 V/div), Ch 2: ON/OFF input (2 V/div).

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

50% of Iout(max); dI/dt = 0.1 A/µs). Load cap: 15 µF tantalum cap and 1 µF

ceramic cap. Ch 1: Vout (1 V/div), Ch 2: Iout (20 A/div).

Figure 12: Output voltage response to step-change in load current (50%-75%-

50% of Iout(max): dI/dt = 1 A/µs). Load cap: 15 µF, 30 mΩ ESR tantalum cap

and 1 µF ceramic cap. Ch 1: Vout (1 V/div), Ch 2: Iout (20 A/div).

Technical Figures