Rainbow-electronics MAX17062 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX17062

TFT-LCD Step-Up DC-DC Converter

6 _______________________________________________________________________________________

PIN NAME FUNCTION

1 COMP

Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. See the Loop

Compensation section for component selection guidelines.

2 FB

Feedback Pin. The FB regulation voltage is 1.24V nominal. Connect an external resistive voltage-divider

between the step-up regulator’s output (V

OUT

) and AGND, with the center tap connected to FB. Place the

divider close to the IC and minimize the trace area to reduce noise coupling. Set V

OUT

according to the

Output Voltage Selection section.

3 SHDN Shutdown Control Input. Drive SHDN low to turn off the MAX17062.

4, 5 PGND Power Ground. Connect pins 4 and 5 directly together.

6, 7 LX

Switch Pin. LX is the drain of the internal MOSFET. Connect the inductor/rectifier diode junction to LX and

minimize the trace area for lower EMI. Connect pins 6 and 7 together.

8 IN Supply Pin. Bypass IN with a minimum 1μF ceramic capacitor directly to AGND.

9 FREQ

Frequency-Select Input. When FREQ is low, the oscillator frequency is set to 640kHz. When FREQ is high,

the frequency is 1.2MHz. This input has a 6μA pulldown current.

10 SS

Soft-Start Control Pin. Connect a soft-start capacitor (C

) to this pin. Leave open for no soft-start. The soft-

start capacitor is charged with a constant current of 4μA. Full current limit is reached when the voltage of

SS pin is charged to 1.5V, which is the current-limit time, t = 2.4  10

. The soft-start capacitor is

discharged to ground when SHDN is low. When SHDN goes high, the soft-start capacitor is charged to 0.4V,

after which soft-start begins.

EP AGND Exposed Pad. Connect to AGND.

Pin Description

PGND

AGND

FREQ

COMP

OUT

+15V/600mA

4.5V TO 5.5V

SHDN

MAX17062

4.7μF

10V

4.7μF

10V

10Ω

1μF

33nF

560pF

OPEN

2.7μH

47kΩ

20kΩ

221kΩ

10μF

25V

10μF

25V

Figure 1. Typical Operating Circuit

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

MAX17062 1

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