Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

LT3754 Datasheet(PDF) 9 Page - Linear Technology

Part No. LT3754
Description  16-Channel × 50mA LED Driver
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3754 Datasheet(HTML) 9 Page - Linear Technology

Back Button LT3754 Datasheet HTML 5Page - Linear Technology LT3754 Datasheet HTML 6Page - Linear Technology LT3754 Datasheet HTML 7Page - Linear Technology LT3754 Datasheet HTML 8Page - Linear Technology LT3754 Datasheet HTML 9Page - Linear Technology LT3754 Datasheet HTML 10Page - Linear Technology LT3754 Datasheet HTML 11Page - Linear Technology LT3754 Datasheet HTML 12Page - Linear Technology LT3754 Datasheet HTML 13Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 28 page
background image
LT3754
9
3754f
BLOCK DIAGRAM
OPERATION
The operation of the LT3754 is best understood by referring
to the typical application circuit on the front page and the
Block Diagram in Figure 1. The LT3754 drives 16 strings
of LEDs by using a constant switching frequency, current
mode boost controller to generate a single output voltage
VOUT for the top (anode) of all LED strings. LED string
current is generated and controlled by connection of the
bottom LED in each string (cathode) to a current source
contained in each corresponding LED pin. Each LED pin
contains an accurate current sink to ground, programmable
between 10mA to 50mA using a single resistor at the ISET
pin. LED channels can be paralleled to achieve higher LED
currents. For applications requiring less than 16 strings
of LEDs, channels can be paralleled or disabled (connect
LED pin to VOUT before startup). For optimum efficiency,
VOUT regulates to the lowest possible voltage allowable to
maintain regulated current in each LED string. Any OPEN
LED fault is indicated by the FAULT pin driven low without
effecting the operation of the connected LED strings.
The Block Diagram in Figure 1 illustrates the key functions
of the LT3754. It can be seen that two external supplies,
VREF and INTVCC, are generated by the LT3754. The VREF
pin provides a precision 1.485V output for use with external
resistors to program the CTRL, OVPSET and TSET input
pins. The INTVCC pin provides a regulated 7V output to
supply the gate driver for the boost controller GATE pin.
An accurate 1.476V threshold on the SHDN/UVLO pin
combined with a SHDN/UVLO pin current hysteresis allows
a programmable resistor divider from VIN to SHDN/UVLO
Figure 1. LT3754 Block Diagram
3754 BD
+
+
+
CHANNEL X
OVERVOLTAGE
AMP
LED AMP
6V
1.1V
+
+
+
LED
LOGIC
R
S
Q
+
INTVCC_UV
VIN_UV
VIN
SHDN_UV
SHDN/UVLO
PWM
VREF
CTRL
1V
SS
R
56R
600k
13
12
11
1.476V
1.485V
SLOPE
100mV
OVER
CURRENT
52mV
PEAK
CURRENT
HICCUP__MODE
VC
EN
PWM
EN
EN
7V(REGULATED)
UVLO( ) = 3.8V, UVLO( ) = 3.4V
4.2V( )
3.7V( )
+
REF
1.485V
27
29
30
32
33
26
VPTAT
+
EN
GATE
SYNC
RT
SENSE
VOUT
LEDx
1-8, 17-24
FAULT
SOFT
START
31
14
16
9
OSC
10
25
15
28
LED CURRENT
CONTROL
INTVCC
OVPSET
VC
ISET
TSET
EXPOSED PAD (GND)


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28 


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn