TPS92550 Datasheet, PDF (1/21 Pages) Texas Instruments – 450mA 14W Constant Current Buck LED Driver Micro-Module

TPS92550
May 17, 2012
450mA 14W Constant Current Buck LED Driver Micro-
Module
General Description
The TPS92550 Constant Current Buck LED Driver Micro-
Module drives maximum 450mA LED current up to 10 LEDs
in a single string (maximum 14W). It integrates all the power
components including the power inductor. The TPS92550
provides a full turn-key, highly efficient solution for wide range
of single string LED lighting applications with up to 96% power
efficiency. It accepts an input voltage ranging from 4.5V to
36V and delivers a 350mA LED current as default. The LED
current is adjustable from 300mA to 450mA by changing a
single external resistor.
The module operates at constant switching frequency
(400kHz) with low Electro Magnetic Interference (EMI) com-
plying with EN55015 standard. The module has fast control
loop to realize fine LED current pulse yielding 256–step PWM
dimming resolution at 240Hz for general lighting. Protection
feature include thermal shutdown, input under-voltage lock-
out, LED open-circuit and short-circuit protections. The
TPS92550 Micro-Module is available in TO-PMOD 7 pin pow-
er package.
Easy to Use 7 Pin Package
Package Highlights
■ ^{7 lead easy-to-use package (Similar to TO-263)}
■ ^{Single exposed die attach pad for enhancing thermal}
performance
■ ^{10.2 x 13.8 x 4.6 mm package}
Applications
■ ^{General Lighting}
Desk Lamps
Cabinet Lamps
Decorative Lamps
Street Lamps
■ ^{Architecture Lighting}
Recess Lights
Spot Lights
Underwater Lights
System Performance
Efficiency vs V_IN , I_LED = 350mA
100
95 ^6LED
8LED
10LED
90
30181001
TO-PMOD 7 Pin Package
10.16 x 13.77 x 4.57 mm (0.4 x 0.39 x 0.18 in)
θ_JA = 20°C/W, θ_JC = 1.9°C/W (Note 1)
RoHS Compliant
Features
■ ^{Integrated all power components including the power}
inductor
■ ^{Wide input voltage range : 4.5V - 36V}
■ ^{Constant switching frequency at 400kHz}
■ ^{High contrast ratio (Minimum dimming current pulse width}
< 16µs)
■ ^{Drives up to 10 LEDs in series at 36V input}
■ ^{±3.6% typical LED current accuracy}
■ ^{LED current adjustable from 300mA to 450mA}
■ ^{Up to 96% efficiency}
■ ^{Input Under-Voltage Lock-Out (UVLO)}
■ ^{Compatible with ceramic and low ESR capacitors}
■ ^{Low Electro Magnetic Interference(EMI) complies with}
EN55015 standard (Note 2)
■ ^{LED open and short circuit protections}
■ ^{Thermal shutdown and RoHS compliant}
■ ^{–40˚C to +125˚C junction temperature range}
85
80
20
24
28
32
36
VIN (V)
30181004
Radiated Emissions (EN 55015)
30181031
LED Current with PWM Dimming
16us dimming pulse
ILED(200mA/DIV)
VDIM(2V/DIV)
4 μs/DIV
30181054
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