88PG8226A1-NFE1C000 Marvell, 88PG8226A1-NFE1C000 Datasheet - Page 33

• Manufacturer Part Number: 88PG8226A1-NFE1C000
• Manufacturer: Marvell

V
V
BUCK
BUCK
V
V
I
I
V
IND
IND
SW
SW
IN
4.3
Copyright © 2008 Marvell
April 23, 2008, 2.00
C
V
V
I
V
V
V
I
V
Figure 25: Switching Waveforms -
Figure 23: Switching Waveforms -
OUT
OUT
IN
BUCK
OUT(P-P)
IN
BUCK
OUT(P-P)
IN
= 5.0V
= 5.0V
= 22 μF
= 1.5A
= 29 mA
= 1.2V
= 1.2V
= 5.4 mV (Note)
=22 mV (Note)
DCM Mode
PWM mode
Switching Waveforms
NOTE: For repeatability of measuring output ripple (V
500 ns/DIV
5
μ
s/DIV
procedure limits the scope bandwidth to 20 MHz and uses a coax cable with very short leads
terminated into 50
possible.
I
Freq = 187 kHz
IND(PK)
V
I
I
Freq = 940 kHz
IND(P-P)
IND(PK)
IN(P-P)
= 440 mA
= 1.73A
= 77.3 mV
= 412.3 mA
Document Classification: Proprietary Information
Ω
. The coax leads must be routed away from the switching node as much as
5V/DIV
20 mV/DIV
200 mA/DIV
5V/DIV
1A/DIV
10 mV/DIV
100 mV/DIV
V
V
BUCK
BUCK
V
V
I
I
V
IND
IND
SW
SW
IN
V
V
I
Ringing Freq = 6.5 MHz
OUT
C
V
V
I
V
IN
BUCK
BUCK (P-P)
OUT
IN
BUCK
OUT(P-P)
IN
Figure 26:
Figure 24: Switching Waveforms -
= 5.0V
= 5.0V
= 2 x 22 μF
= 29 mA
= 1.5A
= 1.2V
= 1.2V
= 5 mV (Note)
) for the BUCK regulator, the standard test
Switching Waveforms - DCM
Mode-Zoom
PWM mode
500 ns/DIV
500 ns/DIV
Functional Characteristics
Doc. No. MV-S103563-00 Rev. C
V
I
I
Freq = 940 kHz
IND(P-P)
IND(PK)
Switching Waveforms
IN(P-P)
= 1.76A
= 58.9 mV
= 446.8 mA
Page 33
5V/DIV
20 mV/DIV
200 mA/DIV
5V/DIV
1A/DIV
10 mV/DIV
50 mV/DIV