MAX1542 Просмотр технического описания (PDF) - Maxim Integrated

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MAX1542

TFT LCD DC-to-DC Converter with Operational Amplifiers

Maxim Integrated 

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.)

OPERATIONAL AMPLIFIER FREQUENCY

RESPONSE FOR VARIOUS CLOAD

20

10

1000pF

0

100pF

56pF

OPERATIONAL AMPLIFIER OVERSHOOT

vs. LOAD CAPACITANCE

100

VSUP = 8V

RL = 10kΩ

80 AV = 1

POS_ = 4V ±50mV

RISING EDGE

60

-10

15pF

40

FALLING EDGE

-20 VSUP = 8V

AV = 1

-30 RL = 10kΩ

100

1k

10k

100k

FREQUENCY (Hz)

OPERATIONAL AMPLIFIER

OUTPUT HIGH VOLTAGE vs. LOAD

160

VSUP = 8V

AV = 1

120

20

0

1

100

1000

LOAD CAPACITANCE (pF)

OPERATIONAL AMPLIFIER

OUTPUT LOW VOLTAGE vs. LOAD

160

VSUP = 8V

AV = 1

120

80

80

40

40

0

0

2

4

6

8

10

IOUT_ (mA)

0

0

2

4

6

8

10

IOUT_ (mA)

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

120

100

80

60

40

20

VSUP = 8V

0

0.1

1

10 100 1k 10k

FREQUENCY (Hz)

OPERATIONAL AMPLIFIER

SETTLING TIME vs. STEP SIZE

500

450

VSUP = 8V

AV = +1

400 RL = 10kΩ

350

CL = 10pF

VCM = 4V

300

250

RISING EDGE

FALLING EDGE

IMAIN

200mA/div

IL

500mA/div

200

150

VMAIN

AC-COUPLED

100

100mV/div

50

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

STEP SIZE (V)

STEP-UP REGULATOR

LOAD-TRANSIENT RESPONSE

MAX1542 toc15

200mA

20mA

L = 4.7µH

RCOMP = 120kΩ

CCOMP = 470pF

40µs/div

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