TPS922052中文資料德州儀器數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

1 Features

? 4.5-V to 65-V wide input range

? LED common anode connection

? Integrated 150-mΩ MOSFET with typical 3-A / 6-A

current limit

? Optional switching frequency: 100 kHz to 2.2 MHz

? Spread spectrum for TPS922053 and TPS922055

? Advanced dimming options:

– Analog dimming (256:1)

– Fast PWM dimming (150-ns pulse width)

– Hybrid and flexible dimming (2,000:1 at 20-kHz

PWM, 10,000:1 at 4-kHz PWM, 1,000,000:1 at

120-Hz PWM)

? CC / CV charging mode

? Full protection features:

– LED open and short protection

– Switching FET open and short protection

– External component failure protection

– Cycle-by-cycle current limit

– Thermal shutdown

– Fault output (open drain)

? Configurable thermal foldback curve

? VSON, WSON and SOT23 package options

2 Applications

? Constant illumination:

– Indoor, outdoor, professional lighting

– Medical, surgical lighting

– Projector, laser TV, printer, IP camera

? Instant illumination:

– Machine vision, camera flash

– Fire alarm, strobe

? CC and CV source:

– LCD backlighting

– Battery charging

– TEC control

3 Description

The TPS92205x family is a 2-A / 4-A nonsynchronous

Buck LED driver with 4.5-V to 65-V

wide input range. By integrating the low-side NMOS

switch, the device is capable of driving LEDs as well

as charging batteries with high power density and

high efficiency. The family also supports common

anode connection and single layer PCB design. The

switching frequency is configurable from 100 kHz to

2.2 MHz with optional spread spectrum feature for

better EMI performance.

The TPS92205x family supports four dimming

options, including analog, PWM, hybrid and flexible

dimming. Each dimming method can be configured

through the PWM and ADIM input pins by means

of simple high and low signals. The family adopts

an adaptive off-time current mode control along with

smart and accurate sampling to enable inductive fast

dimming (IFD) and achieve high dimming accuracy.

The TPS92205x family also provides multiple

systematic protections, including LED open and short,

sense resistor open and short, configurable thermal

foldback and thermal shutdown. A Fault output

sends out acknowledge signals as soon as any fault

condition is detected.