Input:

35-55V

Output:

12V

Current:

67 A

Package:

Quarter-brick

Product # BQ55120QZB67

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-0006255 Rev. C

02/10/16

Page 7

Input:

35-55V

Output:

12V

Current:

67 A

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: Maximum output current derating curve vs. ambient air temperature

(with both baseplate and 0.5” heat sink) at different airflow rates with air

flowing from output to input (nominal input voltage).

Figure 8: Maximum output power derating curve vs. ambient air temperature

(with both baseplate and 0.5” heat sink) at different airflow rates with air

flowing from output to input (nominal input voltage).

Figure 9: Turn-on transient at half load (resistive load) (1 ms/div). Load cap:

15µF tantalum capacitor and 5mF ceramic capacitor bank. Input voltage pre-

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

Figure 10: Turn-on transient at zero load (1 ms/div). Load cap: 15µF tantalum

capacitor and 5mF ceramic capacitor bank. Ch 1: Vout (2V/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 = 0.1A/µs). Load cap: 15µF tantalum cap and 1µF

ceramic cap. Ch 1: Vout (1V/div), Ch 2: Iout (25A/div).

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

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

and 1µF ceramic cap. Ch 1: Vout (1V/div), Ch 2: Iout (25A/div).

Technical Figures