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LM3464A Datasheet Preview

LM3464A Datasheet

LED Driver

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LM3464, LM3464A
www.ti.com
SNVS652F – APRIL 2010 – REVISED MAY 2013
LED Driver with Dynamic Headroom Control and Thermal Control Interfaces
Check for Samples: LM3464, LM3464A
FEATURES
1
2 Wide Input Voltage Range
– 12V-80V (LM3464)
– 12V-95V (LM3464A)
• Dynamic Headroom Control Ensures Maximum
Efficiency
• 4 Output Channels With Individual Current
Regulation
• High Channel to Channel Accuracy
• Digital PWM/Analog Dimming Control Interface
• Resistor Programmable Dimming Frequency
and Minimum Duty Cycle (Analog Dimming
Mode)
• Direct Interface to Thermal Sensor
• Fault Detection
• Over Temperature Protection
• Thermal Shutdown
• Under Voltage Lockout
• Thermal Enhanced TSSOP-28 Package
APPLICATIONS
• Streetlights
• Solid State Lighting Solutions
DESCRIPTION
The LM3464/64A is a 4-channel high voltage current
regulator that provides a simple solution for LED
lighting applications. The LM3464/64A provides four
individual current regulator channels and works in
conjunction with external N-channel MOSFETs and
sense resistors to give accurate driving current for
every LED string. Additionally, the Dynamic
Headroom Control (DHC) output can be interfaced to
the external power supply to adjust the LED supply
voltage to the lowest level that is adequate to
maintain all the string currents in regulation, yielding
the optimal overall efficiency.
Digital PWM or analog voltage signals can be used to
control the duty cycle of the all the channels. When
analog control is used, the dimming frequency can be
programmed via an external capacitor. A minimum
duty cycle control is provided in the conditions that
the analog dimming is configured as thermal
feedback.
Protection features include VIN under-voltage lock-
out, LED open/short circuit and over-temperature fault
signaling to the system controller.
Typical Application
VRAIL
High Power LED Arrays
Voltage
output
RFB1
LM3464/64A
Primary power
supply
RDHC
Voltage
feedback pin
RFB2
CDHC
CFLT
PGND
VDHC
FAULTb
AGND
External voltage headroom control
Fault acknowledgement output
DIM RTHM1
PWM dimming input
5V
0V
RTHM2
A
To NTC thermal
sensor
B
CVCC
RDMIN1
RDMIN2
CTHM
EN VIN
OutP
VLedFB
CDHC
FAULT_CAP
DR1
DR2
DR3
DR4
GD1
SE1
GD2
SE2
VDHC
Faultb
DIM
VCC
GD3
SE3
GD4
SE4
Thermal
DMIN
Thermal_Cap SYNC
AGND PGND
Q1
Q2
Q3
Q4
RISNS1 RISNS2 RISNS3 RISNS4
PGND PGND PGND PGND
NTC thermistor
couple to LED
arrays
A To thermal
sensor
terminals
B
AGND PGND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010–2013, Texas Instruments Incorporated




etcTI

LM3464A Datasheet Preview

LM3464A Datasheet

LED Driver

No Preview Available !

LM3464, LM3464A
SNVS652F – APRIL 2010 – REVISED MAY 2013
Connection Diagram
www.ti.com
Figure 1. Top View
28-Lead TSSOP-28
Package Number PWP
PIN DESCRIPTIONS
Pin
Name
Description
Application Information
1
SYNC
Synchronization signal output for Connect this pin to the DIM pin of other LM3464/64A to enable cascade
cascade operation
operation (multiple device). This pin should leave open for single device
(Master-Slave configuration)
operation.
2 DIM PWM dimming control
Apply logic level PWM signal to this pin controls the average brightness of the
LED string. (<1.25V disable output).
3 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.
4 Thermal_Cap Thermal dimming ramp capacitor Connect a capacitor across this pin and GND to define the thermal dimming
frequency.
5
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.
6
DMIN
Minimum thermal dimming duty The voltage across this pin and GND defines the minimum thermal dimming
control
duty cycle.
7
Faultb
Fault signal output
Open Drain output, pull-down when FAULT condition occurred.
8
AGND
Signal ground
Analog ground connection for internal circuitry. Must be connected to PGND
external to the package.
9 FAULT_CAP Fault delay capacitor
Connect to an external capacitor to program the fault response time.
10
CDHC
DHC time constant capacitor
An external capacitor to ground programs the Dynamic Headroom Control loop
response time
11
OutP
DHC Output
Connect this pin to the voltage feedback input of primary power supply to
facilitate dynamic headroom control.
12 VLedFB Output voltage sense input
This pin senses the output voltage of the primary power supply.
13
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.
14 EN Enable input
This pin serves as device enable input when logic level signal is applied. (Active
high with internal pull-up)
15 VIN Supply voltage
The input voltage should be in the range of 12V to 80V for LM3464, 12–95V for
LM3464A
16
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.
17
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.
18
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.
2 Submit Documentation Feedback
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LM3464 LM3464A


Part Number LM3464A
Description LED Driver
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