Performance Curves
Non-Isolated
3.0 - 3.6V
15A
SIP Converter
in
See Fig. 23
1 µH
See Fig. 22
source
0.9Vout
impedance
See Fig. 24
iS
1.2Vout
1.5Vout
iC
DC/DC
Converter
VOUT
1.8Vout
2.5Vout
VSOURCE
15
µ
Ω
F,
ESR
10 µF
C*
ceramic
100m
capacitor
tantalum
capacitor
* See values for recommended external input capacitance.
Inductor optional as needed.
Figure 24: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 25), Input Reflected Ripple Current
(Figure 26) and Output Voltage Ripple (Figure 27).
Figure 25: Input Terminal Ripple Current, i , at full rated output cur-
c
rent and nominal input voltage with 1
µH source impedance and 200µF
tantalum capacitor (5A/div). See Figure 24.
0.9Vout
1.2Vout
0.9Vout
1.5Vout
1.2Vout
1.5Vout
1.8Vout
2.5Vout
1.8Vout
2.5Vout
Figure 26: Input Reflected Ripple Current, i , through a 1
µH source
Figure 27: Output Voltage Ripple at nominal input voltage and rated
load current (10 mV/div). Load capacitance: 10 F ceramic capacitor
and 15 F tantalum capacitor. Bandwidth: 20 MHz. See Figure 24.
s
inductor at nominal input voltage and rated load current (100 mA/div).
See Figure 24.
µ
µ
Figure 28: Load current (5A/div) as a function of time when 0.9V con-
Figure 29: Load current (5A/div) as a function of time when 2.5V con-
verter attempts to turn on into a 10 m short circuit. Top trace
(10ms/div) is an expansion of the on-time portion of the bottom trace.
verter attempts to turn on into a 10 m
Ω
short circuit. Top trace
Ω
(10ms/div) is an expansion of the on-time portion of the bottom trace.
Product # NQ03xxxVMA15 Phone 1-888-567-9596
Doc.# 005-2NV3xxE Rev. E 6/24/04 Page 11
SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
