Rainbow Electronics MAX8720 - Manual (Page 9)

0
5
15
10
20
25
1.995
REFERENCE VOLTAGE DISTRIBUTION
MAX8720 toc18
REFERENCE VOLTAGE (V)
SAMPLE PERCENTAGE (%)
1.998 2.005 2.002 2.000
100 µs/div
SUSPEND TRANSITION
(SKIP MODE)
1.25V
MAX8720 toc15
0
10A
0
0
12V
A
B
C
D
SKIP = GND, I OUT = 0.2A
A = V OUT , 500mV/div
B = LX, 10V/div
C = D4, 5V/div
D = INDUCTOR CURRENT, 10A/div
-10A
0.65V
5V
0
5
15
10
20
25
-0.48
OUTPUT VOLTAGE DISTRIBUTION
MAX8720 toc17
OUTPUT VOLTAGE ERROR (%)
SAMPLE PERCENTAGE (%)
-0.24 0.48 0.24 0.00
V OUT = 1.25V
50 µs/div
DYNAMIC OUTPUT VOLTAGE TRANSITION
(PWM MODE)
1.65V
MAX8720 toc14
0
10A
0
0
1.25V
12V
A
B
C
D
SKIP = V
CC
, I
OUT
= 0.2A
A = V OUT , 200mV/div
B = LX, 10V/div
C = D4, 5V/div
D = INDUCTOR CURRENT, 10A/div
-10A
100 µs/div
SUSPEND TRANSITION
(PWM MODE)
1.25V
MAX8720 toc16
0
10A
0
0
12V
A
B
C
D
SKIP = V CC , I OUT = 0.2A
A = V OUT , 500mV/div
B = LX, 10V/div
C = D4, 5V/div
D = INDUCTOR CURRENT, 10A/div
-10A
0.65V
5V
MAX8720
Dynamically Adjustable 6-Bit VID
Step-Down Controller
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(MAX8720 Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= 5V, TON = open, T
A
= +25°C, unless otherwise noted.)