LED5000 Datasheet, PDF (1/52 Pages) STMicroelectronics – 3 A monolithic step-down current source with dimming capability

LED5000
3 A monolithic step-down current source with dimming capability
Datasheet − production data
Features
■ 5.5 V to 48 V operating input voltage range
■ 850 kHz fixed switching frequency
■ 200 mV typ. current sense voltage drop
■ buck / buck-boost / floating boost topologies
■ PWM dimming
■ ±3% output current accuracy over temperature
■ 200 mW typical RDS_ON
■ Peak current mode architecture
■ Short-circuit protection
■ Compliant with ceramic output capacitors
■ Inhibit for zero current consumption
■ Thermal shutdown
Applications
■ High brightness LED driving
■ Street lighting
■ Signage
■ Halogen bulb replacement
■ General lighting
Figure 1. Typical application circuit
HPSO8
Description
The LED5000 is an 850 kHz fixed switching
frequency monolithic step-down DC-DC converter
designed to operate as a precise constant current
source with an adjustable current capability up to
3 A DC. The embedded PWM dimming circuitry
features LED brightness control. The regulated
output current level is set by connecting a sensing
resistor to the feedback pin. The 200 mV typical
R_SENSE voltage drop enhances performance in
terms of efficiency. The size of the overall
application is minimized thanks to the high
switching frequency and its compatibility with
ceramic output capacitors. The device is fully
protected against overheating, overcurrent and
output short-circuit. The LED5000 is available in
an HSOP8 package.
VIN
DIM
CIN
CFLT
LED5000
7 _VIN
2 _DIM
3 _INH
COMP
4
1
U1
BOOT
SW
8
FB ⁵
GND
6
L
RS
COUT
GND
January 2013
This is information on a product in full production.
Doc ID 023951 Rev 1
AM13485v1
1/51
www.st.com
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