Rainbow-electronics MAX17127 Manual do Utilizador descarregar pdf (Página 9)

_______________________________________________________________________________________ 9

MAX17127

Six-String WLED Driver with Integrated

Step-Up Converter

Pin Description

Pin Configuration

FPO

DDIO

OVP

FB1

FB2

PGND

1 2

COMP

4 5

15 14 12 11

PWM

AGND

FB4

FB5

FB6

FSLCT

R_FPWM

I.C.

FB3

THIN QFN

(4mm × 4mm)

TOP VIEW

ISET

MAX17127

PIN NAME FUNCTION

1 V

DDIO

5V Linear Regulator Output. V

DDIO

provides power to the MAX17127. Bypass V

DDIO

to AGND with

a ceramic capacitor of 1FF or greater.

2 EN

Enable Pin. EN = high enables the MAX17127. An internal 200kI (typ) pulldown resistor keeps the

MAX17127 in disabled mode if the EN pin is high impedance.

3 FSLCT

Oscillator Frequency-Adjustment Pin. The resistance from FSLCT to AGND sets the step-up

converter’s oscillator frequency:

= 1MHz O 100kI/R

FSLCT

The acceptable resistance range is 100kI < R

FSLCT

< 400kI, which corresponds to the switching

frequency of 1MHz > f

> 250kHz.

4 ISET

Full-Scale LED Current-Adjustment Pin. The resistance from ISET to AGND controls the full-scale

current in each LED string:

LEDMAX

= 20mA O 180kI/R

ISET

The acceptable resistance range is 120kI < R

ISET

< 360kI, which corresponds to a full-scale LED

current of 30mA > I

LEDMAX

> 10mA. Connecting ISET to AGND sets the test mode for 0.3mA (typ)

full-scale LED current.

5 FPO

Fault-Diagnostic Output. Open drain, active low. The FPO output is asserted low when the following

faults occur: overcurrent fault, thermal fault, output-voltage short condition, or output overvoltage.

6 FB6

LED String 6 Cathode Connection. FB6 is the open-drain output of an internal regulator, which

controls current through FB6. FB6 can sink up to 30mA. If unused, connect FB6 to AGND.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 21 22

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