LM3464 datasheet(3/22 Pages) NSC

3 / 22 page

Pin Descriptions

Name

Description

Application Information

SYNC

Synchronization signal output for cascade

operation

(Master-Slave configuration)

Connect this pin to the DIM pin of other LM3464/64A to enable

cascade operation (multiple device). This pin should leave

open for single device operation.

DIM

PWM dimming control

Apply logic level PWM signal to this pin controls the average

brightness of the LED string. (<1.25V disable output).

Thermal

Thermal sensor input

Connect thermal sensor to this pin with bias accordingly to

facilitate thermal foldback and control the brightness of the

LED array.

Thermal_Cap

Thermal dimming ramp capacitor

Connect a capacitor across this pin and GND to define the

thermal dimming frequency.

VDHC

Head room control

Apply external voltage across this pin and ground to define the

minimum drain voltage. This pin is internal biased at 0.9V.

DMIN

Minimum thermal dimming duty control

The voltage across this pin and GND defines the minimum

thermal dimming duty cycle.

Faultb

Fault signal output

Open Drain output, pull-down when FAULT condition

occurred.

AGND

Signal ground

Analog ground connection for internal circuitry. Must be

connected to PGND external to the package.

FAULT_CAP

Fault delay capacitor

Connect to an external capacitor to program the fault response

time.

CDHC

DHC time constant capacitor

An external capacitor to ground programs the Dynamic

Headroom Control loop response time

OutP

DHC Output

Connect this pin to the voltage feedback input of primary power

supply to facilitate dynamic headroom control.

VLedFB

Output voltage sense input

This pin senses the output voltage of the primary power supply.

VCC

Internal regulator output

This pin is the output terminal of the internal voltage regulator

and should be bypassed by a high quality 1uF ceramic

capacitor.

Enable input

This pin serves as device enable input when logic level signal

is applied. (Active high with internal pull-up)

VIN

Supply voltage

The input voltage should be in the range of 12V to 80V for

LM3464, 12–95V for LM3464A

DR4

Channel 4 drain sense input

This pin senses the drain voltage of the external MOSFET of

channel 4 to facilitate DHC operation and fault detection.

DR3

Channel 3 drain sense input

This pin senses the drain voltage of the external MOSFET of

channel 3 to facilitate DHC operation and fault detection.

DR2

Channel 2 drain sense input

This pin senses the drain voltage of the external MOSFET of

channel 2 to facilitate DHC operation and fault detection.

DR1

Channel 1 drain sense input

This pin senses the drain voltage of the external MOSFET of

channel 1 to facilitate DHC operation and fault detection.

LM3464 датащи(PDF) 3 Page - National Semiconductor (TI)

LM3464 датащи(HTML) 3 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

датащи скачать

ссылки URL