5
ELECTRICAL CHARACTERISTICS CURVES
Figure 9: Turn-on transient at zero load current (5 ms/div).
Top Trace: Vout: 1V/div; Bottom Trace: ON/OFF input:
2V/div
Figure 10: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (50mV/div), Bottom Trace: Iout (20
/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: Output voltage response to step-change in load
current (75%-50%-75% of Io, max: di/dt = 2.5A/µs). Load
cap: 470µF, 35m
Ω
ESR solid electrolytic capacitor and 1µF
ceramic capacitor. Top Trace: Vout (100mV/div), Bottom
Trace: Iout (20
/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 12: 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 above.
