Q48SG12034NRFA Datasheet, PDF (6/26 Pages) Delta Electronics, Inc. – Delphi Series Q48SG Quarter Brick Family Full Digital Control DC/DC Power Modules:

ELECTRICAL CHARACTERISTICS CURVES
Figure 9: Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 0.1A/µs, Vin=48V). Load
cap: 10µF, tantalum capacitor and 1µF ceramic capacitor. Top
Trace: Vout (200mV/div, 200us/div); Bottom Trace: Io (15A/div,
200us/div). Scope measurement should be made using a BNC
cable (length shorter than 20 inches). Position the load
between 51 mm to 76 mm (2 inches to 3 inches) from the
module..
Figure 10: Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt = 0.1A/µs, Vin=48V). Load
cap: 10µF, tantalum capacitor and 1µF ceramic capacitor. Top
Trace: Vout (200mV/div, 200us/div); Bottom Trace: Io (15A/div,
200us/div). Scope measurement should be made using a BNC
cable (length shorter than 20 inches). Position the load
between 51 mm to 76 mm (2 inches to 3 inches) from the
module..
is
+
Cs: 220uF
ic
+
100uF,
ESR=0.2 ohm @
25^oC 100KHz
Vin+
Vin-
Figure 11: Test set-up diagram showing measurement points
for Input Terminal Ripple Current and Input Reflected Ripple
Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown below
Figure 12: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 100µF electrolytic capacitor (100 mA/div, 2us/div).
6
DS_Q48SG12034_06272013