MAX1542 Просмотр технического описания (PDF) - Maxim Integrated
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MAX1542 Datasheet PDF : 20 Pages
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TFT LCD DC-to-DC Converter with
Operational Amplifiers
Typical Operating Characteristics (continued)
(VIN = 3.3V, VMAIN = 8V, fOSC = 1.2MHz, TA = +25°C, unless otherwise noted.)
STEP-UP REGULATOR
PULSED LOAD-TRANSIENT RESPONSE
MAX1542 toc16
IMAIN
1A/div
IL
500mA/div
STARTUP SEQUENCE
MAX1542 toc17
VIN
2V/div
VMAIN
8V/div
VMAIN
100mV/div
AC-COUPLED
L = 4.7µH
RCOMP = 120kΩ
CCOMP = 470pF
10µs/div
1ms/div
VGOFF
5V/div
VCOM
10V/div
HEAVY-LOAD
SOFT-START WAVEFORMS
MAX1542 toc18
VIN
5V/div
VMAIN
5V/div
TIMER DELAY LATCH
RESPONSE TO OVERLOAD
MAX1542 toc19
VMAIN
5V/div
IL
2A/div
OPERATIONAL AMPLIFIER
RAIL-TO-RAIL I/O PERFORMANCE
MAX1542 toc20
VPOS1
5V/div
IL
500mA/div
2ms/div
RLOAD = 10Ω
10ms/div
VOUT1
5V/div
VCOM
20V/div
VSUP = 8V
BUFFER CONFIGURATION
100µs/div
VOUT1
5V/div
OPERATIONAL AMPLIFIER
LOAD-TRANSIENT RESPONSE
MAX1542 toc21
VOUT1
4V
1V/div
AC-COUPLED
OPERATIONAL AMPLIFIER
LARGE-SIGNAL STEP RESPONSE
MAX1542 toc22
VPOS1
4V
500mV/div
AC-COUPLED
+50
0
IOUT1
50mA/div
-50
BUFFER CONFIGURATION
1µs/div
VSUP = 8V
AV = 10
1µs/div
VOUT1
2V/div
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