Rainbow-electronics MAX1543 Bedienungsanleitung PDF herunterladen (Seite 9)

MAX1542/MAX1543

TFT LCD DC-to-DC Converter with

Operational Amplifiers

_______________________________________________________________________________________ 9

Typical Operating Characteristics (continued)

= 3.3V, V

MAIN

= 8V, f

OSC

= 1.2MHz, T

= +25°C, unless otherwise noted.)

OPERATIONAL AMPLIFIER

SMALL-SIGNAL STEP RESPONSE

MAX1542 toc24

200ns/div

POS_

50mV/div

AC-COUPLED

OUT_

50mV/div

AC-COUPLED

SUP

= 8V, A

= 1

CH2 + OVER

6.234%

CH2 - OVER

2.352%

OPERATIONAL AMPLIFIER

LARGE-SIGNAL STEP RESPONSE

MAX1542 toc23

1µs/div

OUT_

1V/div

CHI AMPL

4.86V

CHI + OVER

4.970%

= 1

Pin Description

MAX1542 MAX1543

NAME FUNCTION

1 1 COM

Internal High-Voltage MOSFET Switch Common Terminal. Do not allow the voltage on

COM to exceed V

SRC

2 2 SRC

Switch Input. Source of the internal high-voltage P-channel MOSFET. Bypass SRC to

PGND with a minimum of 0.1µF close to the pins.

3, 15, 20 — N.C. No Connection. Not internally connected.

— 3 I.C. Internal Connection. Make no connection to this pin.

4 4 PGND

Power Ground. PGND is the source of the main boost N-channel power MOSFET. Connect

PGND to the output capacitor ground terminals through a short, wide PC board trace.

Connect to analog ground (AGND) underneath the IC.

5 5 AGND Analog Ground. Connect to power ground (PGND) underneath the IC.

6 6 POS1 Operational Amplifier 1 Noninverting Input

7 7 NEG1 Operational Amplifier 1 Inverting Input

8 8 OUT1 Operational Amplifier 1 Output

9 9 OUT2 Operational Amplifier 2 Output

10 10 NEG2 Operational Amplifier 2 Inverting Input

11 11 POS2 Operational Amplifier 2 Noninverting Input

12 12 SUP

Operational Amplifier Power Input. Positive supply rail for the OUT1 and OUT2 amplifiers.

Typically connected to V

MAIN

. Bypass SUP to AGND with a 0.1µF capacitor.

13 13 LX

Power MOSFET N-Channel Drain and Switching Node. Connect the inductor and catch

diode to LX and minimize the trace area for lowest EMI.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 19 20

Kommentare zu diesen Handbüchern

Keine Kommentare

Rainbow-electronics MAX1543 Bedienungsanleitung Seite 9

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Sensoren Rainbow-electronics MAX1543