CAT32TDI-GT3 datasheet(9/14 Pages) CATALYST

No. de pieza	CAT32TDI-GT3

Descripción Electrónicos	CMOS White LED Driver

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Fabricante Electrónico	CATALYST [Catalyst Semiconductor]

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9 / 14 page

CAT32

9

Doc. No. MD-5001 Rev. AD

Characteristics subject to change without notice

LED DIMMING WITH A LOGIC SIGNAL

For applications that need to adjust the LED

brightness in discrete steps, a logic signal can be

used. RMIN sets the minimum LED current value

(when the NMOS is OFF):

RINCR determines how much LED current increases

when the external NMOS switch is turned ON.

LED DIMMING WITH A DC VOLTAGE

PCB Layout Guidelines

The CAT32 is a high-frequency switching regulator

and therefore proper PCB board layout and

component placement can minimize noise and

radiation and increase efficiency. To maximize

efficiency, the CAT32 design has fast switch rise and

fall times. To prevent radiation and high frequency

resonance problems minimize the length and area of

all traces connected to the SW pin and use a ground

plane under the switching regulator.

The switch, schottky output diode and output

capacitor signal path should be kept as short as

possible. The ground connection for the RSET resistor

should be tied directly to the GND pin and not be

shared with other components.

)

MIN

(

LED

MIN

I

V

1

.

0

×

255

=

R

)

Increase

(

LED

INCR

I

V

1

.

0

×

255

=

R

I

–

I

V

1

.

0

–

V

×

225

=

R

)

MIN

(

LEAD

)

MAX

(

LED

MAX

ADJ

CAT32

SHDN

5

PWM

CAT32

RSET

4

PWM

RPWM

RSET

CAT32

RSET

VDC

4

RSET

RADJ

RPWM

CAT32

RSET

PWM

10kΩ

0.1µF

4

RSET

RMIN

CAT32

RSET

RINCR

Logic

Signal

4

Figure 3. LED Dimming Circuits

Número de pieza similar - CAT32TDI-GT3

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Fabricante Electrónico	No. de pieza	Datasheet	Descripción Electrónicos
Catalyst Semiconductor	CAT32	193Kb / 14P	CMOS White LED Driver
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	CAT32TDI-T3	473Kb / 13P	CMOS White LED Driver Doc. No. MD-5005 Rev. V
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ON Semiconductor	CAT32	194Kb / 11P	CMOS White LED Driver March, 2010 ??Rev. 4
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CAT32TDI-GT3 Datasheet(PDF) 9 Page - Catalyst Semiconductor

CAT32TDI-GT3 Datasheet(HTML) 9 Page - Catalyst Semiconductor

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