MAX1875A Просмотр технического описания (PDF) - Maxim Integrated
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MAX1875A
Maxim Integrated
MAX1875A Datasheet PDF : 22 Pages
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Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, TA = +25°C, unless otherwise noted.)
START AND STOP WAVEFORM
(MAX1875A/MAX1876A ONLY)
10V MAX1858A/75A/76A toc09
EN
0V
VOUT1
1V/div
IOUT1 = 300mA
0V
PREBIAS STARTUP
VOUT2
1V/div
IOUT2 = 300mA
0V
2ms/div
OUT-OF-PHASE WAVEFORM
MAX1858A/75A/76A toc12
VOUT1
20mV/div
12V
VLX1
0V
12V
VLX2
0V
VOUT2
20mV/div
INPUT POWER REMOVAL
MAX1858A/75A/76A toc10
VIN
10V/div
0V
VOUT1
1V/div
IOUT1 = 300mA
0V
VOUT2
1V/div
IOUT2 = 300mA
0V
5ms/div
EXTERNALLY SYNCHRONIZED
SWITCHING WAVEFORM
5V MAX1858A/75A/76A toc13
VSYNC
0V
5V
VCK0
0V
10V
VLX1
0V
VOUT1
10mV/div
AC-COUPLED
RESET TIMEOUT
(MAX1858A/MAX1876A ONLY)
MAX1858A/75A/76A toc11
100ms/div, 5V/div
EN
0
VOUT2
0V
VOUT1
0V
VRST
0V
CKO OUTPUT WAVEFORM
MAX1858A/75A/76A toc14
SYNC = GND
5V
VCK0
0V
10V
VLX1
0V
VOUT1
10mV/div
AC-COUPLED
1µs/div
400ns/div
400ns/div
CKO OUTPUT WAVEFORM
MAX1858A/75A/76A toc15
SYNC = VL
5V
VCK0
0V
10V
VLX1
0V
VOUT1
10mV/div
400ns/div
SHORT-CIRCUIT CURRENT FOLDBACK
AND RECOVERY
MAX1858A/75A/76A toc16
IOUT1 = 10A (5A/div)
VOUT1 = 1.8V (1V/div)
SHORT
VOUT2
VOUT2 = 2.5V (1V/div)
IOUT2 = 10A (5A/div)
4ms/div
_______________________________________________________________________________________ 5
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