MAX8775 Просмотр технического описания (PDF) - Maxim Integrated
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MAX8775 Datasheet PDF : 30 Pages
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Dual and Combinable Graphics Core
Controller for Notebook Computers
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, VDD = VCC = 5V, SKIP_ = GND, TA = +25°C, unless otherwise noted.)
STARTUP WAVEFORMS
MAX8775 toc10
A
0
0
B
C
0
D
0
5A
E
0
200μs/div
A: ON1, 5V/div
B: DL1, 5V/div
C: VOUT1, 1V/div
D: PGOOD1, 5V/div
E: ILX1, 5A/div
SKIP1 = GND, RLOAD1 = 1Ω, VIN = 12V
SHUTDOWN WAVEFORMS
MAX8775 toc11
0
A
0
0
B
1.5V
0
0
C
0
0
D
5V
5A
0
5V
0
E
0
STARTUP/SHUTDOWN—
SAME SLEW RATE
MAX8775 toc12
A
B
C
D
E
200μs/div
A: ON1, 5V/div
B: DL1, 5V/div
C: VOUT1, 1V/div
D: PGOOD1, 5V/div
E: ILX1, 5A/div
SKIP1 = GND, RLOAD1 = 1Ω, VIN = 12V
400μs/div
A: ON1, ON2, 5V/div
B: VOUT1, 1V/div
C: VOUT2, 1V/div
D: PGOOD1, 5V/div
E: PGOOD2, 5V/div
CSLEW1 = CSLEW2 = 470pF
RLOAD1 = RLOAD2 = 1Ω
STARTUP/SHUTDOWN—
SAME START TIME
MAX8775 toc13
A
0
0
B
0
C
5V
0
D
5V
E
0
400μs/div
A: ON1, ON2, 5V/div
B: VOUT1, 1V/div
C: VOUT2, 1V/div
D: PGOOD1, 5V/div
E: PGOOD2, 5V/div
CSLEW1 = 470pF, CSLEW2 = 600pF
RLOAD1 = RLOAD2 = 1Ω
LOAD TRANSIENT (SEPARATE MODE)
MAX8775 toc14
1.2V
A
5V
B
0
12V
C
0
10A
0
D
20μs/div
A: VOUT1, 100mV/div
B: DL1, 5V/div
C: LX1, 10V/div
D: ILX1, 10A/div
VIN = 12V, VOUT1 = 1.2V
SKIP1 = GND
IOUT1 = 1A TO 11A TO 1A
LOAD TRANSIENT (COMBINED MODE)
MAX8775 toc15
1.5V
A
10A
B
0
12V
C
0
12V
D
0
20μs/div
A: VOUT1, 100mV/div
B: ILX1, 10A/div
C: LX1, 10V/div
D: LX2, 10V/div
VIN = 12V, VOUT = 1.5V
IOUT1 = 5A TO 25A TO 5A
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