MAX1889 データシートの表示（PDF） - Maxim Integrated

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MAX1889

Triple-Output TFT LCD Power Supply with Fault Protection

Maxim Integrated 

Triple-Output TFT LCD Power Supply

with Fault Protection

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = +3.3V, VMAIN = +9V, VPL = +20V, VNL = -7V, SHDN = FREQ = IN, PGND = GND, TA = +25°C, unless

otherwise noted.)

NEGATIVE LINEAR-REGULATOR

LOAD-TRANSIENT RESPONSE

MAX1889 toc22

-6.95V

A

-7V

OVERCURRENT PROTECTION RESPONSE

TO OVERLOAD DURING STARTUP

5V MAX1889 toc23

A

0

5V

B

0

10V

C

0

0

B

-10mA

D

0

400µs/div

-10V

20ms/div

A: VNL = -7V, 50mV/div, AC-COUPLED

B: INL = 0 TO -10mA, 10mA/div

A: VGATE, 5V/div

B: VMAIN, 5V/div; IMAIN = 1.5A

C: VPL, 10V/div; IPL = 10mA

D: VNL, 10V/div; INL = 10mA

OVERCURRENT PROTECTION RESPONSE

TO OVERLOAD DURING NORMAL OPERATION

5V MAX1889 toc24

A

0

B

5V

0

20V

C

10V

0

0

D

-10V

20ms/div

A: VGATE, 5V/div

B: VMAIN = 9V, 5V/div; IMAIN = 200mA TO 1.5A

C: VPL = 20V, 10V/div; IPL = 10mA

D: VNL = -7V, 10V/div; INL = 10mA

REFERENCE VOLTAGE vs. LOAD CURRENT

1.250

1.249

1.248

1.247

1.246

1.245

0 10 20 30 40 50 60 70 80 90 100

LOAD CURRENT (µA)

LX CURRENT LIMIT vs. INPUT VOLTAGE

2.4

2.3

2.2

2.1

2.0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

INPUT VOLTAGE (V)

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