DS_E48SP12020_08252011
5
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 (80mV/div, 200us/div); Bottom Trace: Io (10A/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 (80mV/div, 200us/div); Bottom Trace: Io (10A/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 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 (L
TEST
) of 12 µH. Capacitor Cs offset
possible battery impedance. Measure current as shown below
Figure 12: Input Terminal Ripple Current, i
c
, at full rated output
current and nominal input voltage with 12µH source impedance
and 100µF electrolytic capacitor (200 mA/div, 2us/div).
Vin+
Vin-
is
ic
100uF,
ESR=0.2 ohm @
25
o
C 100KHz
Cs: 220uF
+ +
Vin+
Vin-
is
ic
100uF,
ESR=0.2 ohm @
25
o
C 100KHz
Cs: 220uF
+ +
is
ic
100uF,
ESR=0.2 ohm @
25
o
C 100KHz
Cs: 220uF
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