DS_H48SA12025_05052008
5
ELECTRICAL CHARACTERISTICS CURVES
Figure 9: Turn-on transient at zero load current, 4 ms/div;
Top Trace: Vout, 5V/div; Bottom Trace: ON/OFF input,
5V/div.
Figure 10: Output voltage response to step-change in load
current, 200mV/div, 200us/div. 75%-50%-75% of Io, max, di/dt =
0.1
/µs. Load cap: 10µF, tantalum capacitor and 1µF ceramic
capacitor.
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..
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
++ ++
Figure 11: Output voltage response to step-change in load
current, 200mV/div, 1ms/div. 75%-50%-75% of Io, max, di/dt
= 1A/µs. Load cap: 5000µF tantalum capacitor and 1µF
ceramic capacitor.
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 (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measured current as shown below.
0
0
