Rainbow-electronics MAX1543 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX1542/MAX1543

TFT LCD DC-to-DC Converter with

Operational Amplifiers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

= 3V, V

SUP

= 8V, V

SRC

= 28V, FREQ = IN (MAX1543), PGND = AGND = 0, T

= -40°C to +85°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

DEL Turn-On Threshold

(

DEL

)

1.178 1.240 1.302

DEL Discharge Switch On-

Resistance

During UVLO, V

= 2.2V 20 Ω

CTL Input Low Voltage V

= 2.6V to 5.5V 0.6 V

CTL Input High Voltage V

= 2.6V to 5.5V 2 V

CTL Input Leakage Current CTL = AGND or IN -1 +1 µA

CTL-to-SRC Propagation Delay

100

SRC Input Voltage Range 28 V

MAX1542 70

130

D RN

= 8V , C TL = IN ,

D E L

= 1.5V

MAX1543

100 180

SRC Input Current I

SRC

DRN

= 8V, CTL = AGND, V

DEL

= 1.5V 15 30

µA

DRN Input Current I

DRC

DRN

= 8V, CTL = AGND, V

DEL

= 1.5V,

MAX1543

150

µA

MAX1542 5 10

SRC to COM Switch On-

Resistance

SRC

(

)

DEL

= 1.5V,

CTL = IN

MAX1543 15 30

Ω

DRN to COM Switch On-

Resistance (MAX1543)

DRN

(

)

DEL

= 1.5V, CTL = AGND 30 60 Ω

COM to PGND Switch On-

Resistance (MAX1543)

COM

(

)

DEL

= 1.1V

350 1000 1800

Ω

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

IN Supply Range V

2.6 5.5 V

rising 2.3 2.7

IN Undervoltage Lockout

Threshold

UVLO

falling 2.2 2.5

= 1.3V, LX not switching

0.65

IN Quiescent Current I

= 1.1V, LX switching 6.5

MAIN STEP-UP REGULATOR

Output Voltage Range V

MAIN

13 V

MAX1542

1000 1400

FREQ = AGND

512 768

Operating Frequency f

OSC

MAX1543

FREQ = IN

1000 1400

kHz

FB Regulation Voltage V

No load

1.215 1.260

FB Fault Trip Level V

falling

0.96 1.04

FB Line Regulation V

= 2.6V to 5.5V

0.15

%/V

FB Transconductance ∆I

COMP

= 5µA 75

300

µS

LX On-Resistance

(

)

400

mΩ

ELECTRICAL CHARACTERISTICS (continued)

= 3V, V

SUP

= 8V, V

SRC

= 28V, FREQ = IN (MAX1543), PGND = AGND = 0, T

= 0°C to +85°C, typical values at T

= +25°C,

unless otherwise noted.)

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