Product # BQ50120QTA20

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2BQ512J Rev. E

03/17/06

Page 6

Input:

Input:

Output:

Output:

Current:

Current:

ackage:

42-53 V

42-53 V

12 V

12 V

20 A

20 A

Quarter-brick

Quarter-brick

T

pecification

0

2

4

6

8

10

12

14

16

18

20

0

25

40

55

70

85

Ambient Air Temperature (

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 LFM (0 m/s)

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

perature for airflow rates of 0 LFM through 400 LFM with air flowing

from input to output (nominal input voltage).

Figure 8: Thermal plot of converter at 20 amp load current (240W)

converter from input to output (nominal input voltage).

Figure 9: Turn-on transient at full load (resistive load) (2 ms/div).

Ch 1: Vout (5V/div); Ch 2: ON/OFF Pin (5V/div).

Figure 10: Turn-on transient at zero load (2 ms/div).

Ch 1: Vout (5V/div); Ch 2: ON/OFF Pin (5V/div).

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).

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

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

Semiconductor junction temperature is

within 1°C of surface temperature

source

impedance

DC/DC

Converter

See Fig. 14

See Fig. 13

See Fig. 15

ceramic

capacitor

15 µF,

450m

Ω ESR

tantalum

capacitor

47 µF,

<1

Ω ESR

electrolytic

capacitor

i

S

i

C