LT3519IMS-1#TRPBF Linear Technology, LT3519IMS-1#TRPBF Datasheet - Page 10

• Manufacturer Part Number: LT3519IMS-1#TRPBF
• Description: LED DRIVER WITH INTEGRATED SCHOT
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3519IMS-1#TRPBF

• Constant Current: Yes
• Constant Voltage: Yes
• Topology: PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive
• Frequency: 800kHz ~ 1.10MHz
• Voltage - Supply: 3 V ~ 30 V
• Mounting Type: Surface Mount
• Package / Case: 16-MSOP
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 750mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Efficiency: -

APPLICATIONS INFORMATION
LT3519/LT3519-1/LT3519-2
For open LED protection of a boost type LED driver, set
the resistor from the output to the FB pin such that the
expected V
1.1V. For a buck mode or buck-boost mode LED driver,
the output voltage is typically level-shifted to a signal with
respect to GND as illustrated in Figure 2. The open LED
voltage level can be expressed as:
10
V
OUT
Figure 2. Open LED Protection FB Resistor Connector
for Buck Mode or Buck-Boost Mode LED Driver
= V
FB
LT3519-1/
LT3519-2
BE(Q1)
LT3519/
during normal operation will not exceed
+
FB
R2
R1
Q1
• 1.22V
R1
R2
3519 F02
+
–
V
OUT
100k
R
SENSE(EXT)
LED
ARRAY
Programming the Turn-On and Turn-Off Thresholds
with the SHDN/UVLO Pin
The falling SHDN/UVLO value can be accurately set by
the resistor divider. A small 2.2μA pull-down current is
active when SHDN/UVLO is below the 1.22V threshold.
The purpose of this current is to allow the user to program
the rising hysteresis. The following equations should be
used to determine the values of the resistors:
V
V
IN(FALLING)
IN(RISING)
Figure 3. SHDN/UVLO Threshold Programming
= 2.2µA • R1+ V
=
LT3519-1/
LT3519-2
LT3519/
R1+ R2
R2
SHDN/UVLO
• 1.22V
IN(FALLING)
V
IN
R1
R2
3519 F03
3519fa