Rainbow-electronics MAX1543 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX1542/MAX1543

TFT LCD DC-to-DC Converter with

Operational Amplifiers

_______________________________________________________________________________________ 5

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LX Current Limit I

LIM

= 1V, duty cycle = 65% 1.2 1.8 A

Current-Sense Transresistance 0.30 0.65 Ω

OPERATIONAL AMPLIFIERS

SUP Supply Range V

SUP

4.5 13.0 V

SUP Supply Current I

SUP

Buffer configuration, V

POS_

= 4V, no load 2.1 mA

Input Offset Voltage V

= V

SUP

/2, T

= +25ºC12mV

Input Bias Current I

BIAS

NEG1, NEG2, POS1, POS2 ±50 nA

Input Common-Mode Voltage

Range

SUP

OUT_

= 100µA

SUP

Output Voltage Swing High V

OUT_

= 5mA

SUP

150

OUT_

= -100µA 15

Output Voltage Swing Low V

OUT_

= -5mA 150

Source 50

Short-Circuit Current To V

SUP

Sink 50

Output Source-and-Sink Current

Buffer configuration, V

POS_

= 4V,

| ∆V

| < 10mV

40 mA

POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES

DEL Capacitor Charge Current During startup, V

DEL

= 1.0V 4 6 µA

DEL Turn-On Threshold V

(

DEL

)

1.178 1.302 V

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

SRC Input Voltage Range 28 V

MAX1542 130

DRN

= 8V, CTL = IN,

DEL

= 1.5V

MAX1543 180

SRC Input Current I

SRC

DRN

= 8V, CTL = AGND, V

DEL

= 1.5V 30

µA

DRN Input Current I

DRN

= 8V, CTL = AGND, V

DEL

= 1.5V,

MAX1543

150 µA

MAX1542 10

SRC to COM Switch On-

Resistance

SRC

(

)

DEL

= 1.5V, CTL = IN

MAX1543 30

Ω

DRN to COM Switch On-

Resistance (MAX1543)

DRN

(

)

DEL

= 1.5V, CTL = AGND 60 Ω

COM to PGND Switch On-

Resistance (MAX1543)

COM

(

)

DEL

= 1.1V 350 1800 Ω

ELECTRICAL CHARACTERISTICS (continued)

= 3V, V

SUP

= 8V, V

SRC

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

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

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