Rainbow-electronics MAX1543 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1542/MAX1543

TFT LCD DC-to-DC Converter with

Operational Amplifiers

_______________________________________________________________________________________ 3

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.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

FB Input Bias Current V

= 1.5V -40 +40 nA

FB Transconductance ∆I

COMP

= 5µA 75 160 280 µS

FB Voltage Gain FB to COMP 700 V/V

LX On-Resistance R

(

)

210 400 mΩ

LX Leakage Current I

= 13V 0.01 20 µA

LX Current Limit I

LIM

= 1V, duty cycle = 65% 1.2 1.5 1.8 A

Current-Sense Transresistance 0.30 0.50 0.65 Ω

MAX1542 14

FREQ = AGND 13Soft-Start Period t

MAX1543

FREQ = IN 14

Soft-Start Step Size I

LIM

/ 8 A

OPERATIONAL AMPLIFIERS

SUP Supply Range V

SUP

4.5 13.0 V

SUP Supply Current I

SUP

Buffer configuration, V

POS_

= 4V, no load 1.3 1.9 mA

Input Offset Voltage V

= V

SUP

/2, T

= +25°C 0 12 mV

Input Bias Current I

BIAS

NEG1, NEG2, POS1, POS2 +1 ±50 nA

Input Common-Mode Voltage

Range

SUP

Common-Mode Rejection Ratio CMRR 0 ≤ V

NEG_

, V

POS_

≤ V

SUP

50 90 dB

Open-Loop Gain 125 dB

OUT_

= 100µA

SUP

Output Voltage Swing High V

OUT_

= 5mA

SUP

150

SUP

OUT_

= -100µA 2 15

Output Voltage Swing Low V

OUT_

= -5mA 80 150

Source 50 150

Short-Circuit Current To V

SUP

Sink 50 140

Output Source-and-Sink Current

Buffer configuration, V

POS_

= 4V,

|∆V

OS|

< 10mV

40 mA

Power-Supply Rejection Ratio PSRR

DC, 6V ≤ V

SUP

≤ 13V, V

NEG_

, V

POS_

SUP

60 100 dB

Slew Rate 7.5 V/µs

-3dB Bandwidth R

= 10kΩ, C

=10pF, buffer configuration 12 MHz

Gain-Bandwidth Product GBW Buffer configuration 8 MHz

POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES

DEL Capacitor Charge Current During startup, V

DEL

= 1V 4 5 6 µA

1 2 3 4 5 6 7 8 ... 19 20

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