Typical operating characteristics (continued) – Rainbow Electronics MAX17008 User Manual
Page 10
MAX17007A/MAX17008
Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
10
______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= 5V, SKIP = GND, T
A
= +25°C, unless otherwise noted.)
SMPS1 STARTUP WAVEFORM
(HEAVY LOAD)
MAX17007A/8 toc19
200
μs/div
A
B
E
F
G
C
D
5V
A. EN1, 5V/div
B. REF, 2V/div
C. V
OUT1
, 500mV/div
D. I
LX1
, 10A/div
E. PGOOD1, 10V/div
F. LX1, 10V/div
G. DL1, 10V/div
0
2V
5V
0
12V
0
5V
0
0
1.05V
0
8A
I
OUT1
= 8A
SMPS1 STARTUP WAVEFORM
(LIGHT LOAD)
MAX17007A/8 toc20
200
μs/div
A
B
E
F
G
C
D
5V
A. EN1, 5V/div
B. REF, 2V/div
C. V
OUT1
, 500mV/div
D. I
LX1
, 5A/div
SKIP = 5V
I
OUT1
= 2A
E. PGOOD1, 10V/div
F. LX1, 10V/div
G. DL1, 10V/div
0
2V
0
1.05V
0
2A
0
5V
0
5V
0
0
12V
SMPS1 SHUTDOWN WAVEFORM
MAX17007A/8 toc21
200
μs/div
A
B
E
F
G
C
D
5V
A. EN1, 5V/div
B. REF, 5V/div
C. V
OUT1
, 500mV/div
D. I
LX1
, 5A/div
E. PGOOD1, 10V/div
F. LX1, 10V/div
G. DL1, 10V/div
I
OUT1
= 0.5A
SKIP = GND
0
2V
1.05V
0
0
0
5V
0
5V
0
12V
SMPS2 LOAD-TRANSIENT RESPONSE
(PWM MODE)
MAX17007A/8 toc22
20
μs/div
A
B
C
A. V
OUT2
, 50mV/div
B. I
LX2
, 10A/div
C. LX2, 10V/div
1.5V
10A
2A
12V
0
I
OUT2
= 2A TO 10A TO 2A
SKIP = 5V
SMPS2 LOAD-TRANSIENT RESPONSE
(SKIP MODE)
MAX17007A/8 toc23
20
μs/div
A
B
C
A. V
OUT2
, 50mV/div
B. I
LX2
, 10A/div
C. LX2, 10V/div
1.5V
8A
0A
12V
0
I
OUT2
= 0.5A TO 8.5A TO 0.5A
SKIP = GND
SMPS1 OUTPUT OVERLOAD WAVEFORM
MAX17007A/8 toc24
200
μs/div
A
B
E
C
D
I
OUT1
= 2A TO 15A
A. V
OUT1
, 500mV/div
B. I
LX1
, 10A/div
C. LX1, 10V/div
1.05V
10A
2A
5V
0
5V
12V
0
0
D. PGOOD1, 5V/div
E. DL1, 5V/div
SMPS1 OUTPUT OVERVOLTAGE
WAVEFORM
MAX17007A/8 toc25
40
μs/div
A
B
C
A. V
OUT1
, 1V/div
B. PGOOD1, 5V/div
C. DL1, 5V/div
1.05V
0
5V
0
5V
0