LT3592EDDB#TRMPBF Linear Technology, LT3592EDDB#TRMPBF Datasheet - Page 10

• Manufacturer Part Number: LT3592EDDB#TRMPBF
• Description: IC LED DRVR HP CONST CURR 10-DFN
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3592EDDB#TRMPBF

• Constant Current: Yes
• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive
• Type - Secondary: White LED
• Frequency: 400kHz ~ 2.2MHz
• Voltage - Supply: 3.6 V ~ 36 V
• Voltage - Output: 20V
• Mounting Type: Surface Mount
• Package / Case: 10-DFN
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 50mA, 500mA
• Internal Switch(s): Yes
• Led Driver Application: Automotive, Industrial Lighting
• No. Of Outputs: 1
• Output Current: 500mA
• Output Voltage: 30V
• Input Voltage: 3.6V To 36V
• Dimming Control Type: PWM
• Rohs Compliant: Yes
• Operating Supply Voltage (typ): 5/9/12/15/18/24V
• Number Of Segments: 2
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Package Type: DFN EP
• Pin Count: 10
• Mounting: Surface Mount
• Operating Supply Voltage (max): 36V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Lead Free Status / Rohs Status: Compliant
• Other names: LT3592EDDB#TRMPBFTR

Table 1. R
FB Resistor Network
The output voltage limit is programmed with a resistor
divider between the output and the V
voltage that the output will be clamped to in case the LED
goes open circuit. Choose the resistors according to
Be sure to choose V
the operation of the current control loop; it should be set
at least 10% above the maximum expected LED voltage
for the selected BRIGHT output current. R2 should be 20k
or less to avoid bias current errors. An optional phase-
lead capacitor of 22pF between V
light-load ripple.
Output Current Selection
The output current levels are programmed by the value of
the external current sense resistor between CAP and OUT.
LT3592
APPLICATIONS INFORMATION
Oscillator
The frequency of operation is programmed by an external
resistor from R
commonly used oscillator frequencies, and refer to the Typi-
cal Performance Characteristics curve for other values.
Table 2. Inductor Vendor Information
SUPPLIER
Panasonic
Vishay
Coilcraft
CoEv Magnetics
Murata
Sumida
TDK
TOKO
10
R1 = R2([V
T
Values for Selector Oscillator Frequencies
400kHz
900kHz
2.2MHz
f
OSC
OUT
T
to ground. Table 1 shows R
/1.21V] – 1)
OUT
PHONE
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
USA: [phone]
Japan: 81(3) 3607-5111
[phone]
[phone]
such that it does not interfere with
OUT
FB
and V
48.7k
357k
140k
pin. This is the
FAX
[phone]
[phone]
[phone]
[phone]
USA: [phone]
Japan: 81(3) 3607-5144
[phone]
[phone]
R
T
T
FB
values for
reduces
The BRIGHT mode current is given by:
The DIM mode current is 10% of the BRIGHT mode value.
The maximum allowed DC value of the BRIGHT mode cur-
rent is 500mA. When the recommended component values
are used in a 900kHz 2 LED application, the transient from
switching between BRIGHT and DIM currents will be less
than 50μs in duration.
The sense resistor used should exhibit a low TC to keep
the LED current from drifting as the operating temperature
changes.
The BRIGHT pin can tolerate voltages as high as 36V and
can be safely tied to V
but it also has a low threshold voltage (~0.7V) that allows
it to interface to logic level control signals.
Input Voltage Range
The maximum allowed input voltage for the LT3592 is
36V. The minimum input voltage is determined by either
the LT3592’s minimum operating voltage of 3.6V or by
its maximum duty cycle. The duty cycle is the fraction of
time that the internal switch is on and is determined by
the input and output voltages:
where V
(~0.4V) and V
www.panasonic.com/industrial/components/components.html
www.vishay.com/resistors
www.coilcraft.com
www.circuitprotection.com/magnetics.asp
www.murata.com
www.sumida.com
www.component.tdk.com
www.tokoam.com
I
DC =
BRIGHT
D
V
IN
is the forward voltage drop of the catch diode
= 200mV/R
V
– V
OUT
SW
SW
+ V
is the voltage drop of the internal switch
+ V
D
IN
SENSE
D
even in high voltage applications,
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3592fc