TPS92551 Datasheet, PDF (1/21 Pages) Texas Instruments – 450mA 23W Constant Current Buck LED Driver Micro-Module

TPS92551
May 17, 2012
450mA 23W Constant Current Buck LED Driver Micro-
Module
General Description
The TPS92551 Constant Current Buck LED Driver Micro-
Module drives maximum 450mA LED current up to 16 LEDs
in a single string (maximum 23W). It integrates all the power
components including the power inductor. The TPS92551
provides a full turn-key, highly efficient solution for wide range
of single string LED lighting applications with up to 95% power
efficiency. It accepts an input voltage ranging from 4.5V to
60V and delivers a 350mA LED current as default. The LED
current is adjustable from 300mA to 450mA by charging a
single external resistor.
The module operates at constant switching frequency
(800kHz) 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
features include thermal shutdown, input under-voltage lock-
out, LED open-circuit and short-circuit protections. The
TPS92551 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 enhanced 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
10LED
6LED
14LED ^16LED
90
85
30172701
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 - 60V}
■ ^{Constant switching frequency at 800kHz}
■ ^{High contrast ratio (Minimum dimming current pulse width}
< 16µs)
■ ^{Drives up to 16 LEDs in series at 60V input}
■ ^{±3.5% typical LED current accuracy}
■ ^{LED current adjustable from 300mA to 450mA}
■ ^{Up to 95% 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}
80
75
25 30 35 40 45 50 55 60
VIN (V)
30172750
Radiated Emissions (EN 55015)
30172731
LED Current with PWM Dimming
16us dimming pulse
ILED(200mA/DIV)
VDIM(2V/DIV)
4 μs/DIV
30172742
© 2012 Texas Instruments Incorporated 301727 SNVS805A
www.ti.com