Q36SR12017_12272012
5
ELECTRICAL CHARACTERISTICS CURVES
Figure 8: Test set-up diagr am showing measurement point s for
Input Term inal Ripple Curr ent and Input Re flected Ripple
Current.
Note: Measured input r eflected-ripple cur rent with a simu lated
source Inductance (L
TEST
) of 12 µH . Ca pacito r Cs offset
possible battery impedance. Measure cur rent as shown above
Figure 9: Input Ter minal R ipple Current , i
c
, at fu ll rated output
current and nominal input volt age (Vin=48V) with 12µH source
impedance and 33µF electroly tic cap acitor (1A/div, 5us/div)
Figure 10: Inpu t reflecte d ripp le curren t , i
s
, through a 12µH
source inductor at nominal input voltage (Vin=48V) and rated
load current (20 mA/d iv, 5us/div)
Figure 11: Output voltage noise and ripple measurement test
setup
Figure 12: Output voltage ripple at nominal input voltage
(Vin=48V) and rated load current (50 mV/div, 2us/div).Load
capacitance: 1µF ceramic capacitor and 10µF tantalum
capa ci tor. Bandw idth: 20 MHz. Scope m easu remen t s sho uld be
made using a BNC cable (length shorter than 20 inc hes).
Position the load betw een 51 mm to 76 mm (2 inches to 3
inches) from the m odule
Figure 13: Output voltage vs. load current showing typical
curre nt limit curves and converter shutdown points (Vin=48V)
StripCopper
Vo(-)
Vo(+)
10u
1u
SCOPE RESISTIV
LOAD
0
0
0
