Product # BQ55090EZB48

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-0006251 Rev. C

02/17/16

Page 8

Input:

35-55V

Output:

9.6V

Current:

48A

Package:

Eighth-brick

0

3

6

9

12

15

0

10

20

30

40

50

60

Load Current (A)

35 Vin

48 Vin

55 Vin

source

impedance

DC-DC

Converter

Input

Terminal

Ripple

Current

Input

Reflected

Ripple

Current

Output

Voltage

Ripple

ceramic

capacitor

tantalum

capacitor

electrolytic

capacitor

i

S

i

C

Figure 13: Test set-up diagram showing measurement points for Input Terminal

Ripple Current (Figure 14), Input Reflected Ripple Current (Figure 15) and

Output Voltage Ripple (Figure 16).

Figure 14: Input Terminal Ripple Current, ic, at full rated output current and

nominal input voltage with 10µH source impedance and 47µF electrolytic

capacitor (1A/div). See Figure 13.

Figure 15: Input reflected ripple current, is, through a 10µH source inductor,

using a 47µF electrolytic input capacitor (20mA/div). See Figure 13.

Figure 16: Output voltage ripple at nominal input voltage and rated load current

(50mV/div). Load capacitance: 1µF ceramic capacitor and 15µF tantalum

capacitor. Bandwidth: 20MHz. See Figure 13.

Figure 17: Output voltage vs. load current for different input voltages showing

typical current limit curves.

Figure 18: Load current (50A/div) as a function of time when the converter

attempts to turn on into a 1mΩ short circuit. Top trace (500µs/div) is an

expansion of the on-time portion of the bottom trace.

Technical Figures