Texas Instruments TPS92550EVM Evaluation Module TPS92550EVM/NOPB TPS92550EVM/NOPB 데이터 시트
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TPS92550EVM/NOPB
User's Guide
SNVA640A – May 2012 – Revised May 2013
AN-2208 TPS92550 450mA 36V LED Driver Micro-Module
Evaluation Board
1
Introduction
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. The TPS92550 accepts an input voltage
ranging from 4.5V to 36V and delivers a highly accurate 350mA LED current as default. The LED current
is adjustable from 300mA to 450mA by charging a single external resistor.
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. The TPS92550 accepts an input voltage
ranging from 4.5V to 36V and delivers a highly accurate 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 (400kHz) with low Electro Magnetic
Interference(EMI) complying 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 lockout, LED open-circuit and short-circuit protections. The
TPS92550 Micro-Module is available in PFM 7 pin power package.
Interference(EMI) complying 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 lockout, LED open-circuit and short-circuit protections. The
TPS92550 Micro-Module is available in PFM 7 pin power package.
2
Board Specifications
•
V
IN
= 4.5V to 36V
•
I
LED
= 350mA (default I
LED
setting, refer to
for other I
LED
settings)
•
I
LED
= 300mA to 450mA
•
Designed on two layers, all two layers are 2oz. copper weight.
3
Evaluation Board Design For I
LED
Setting and EMI
The evaluation board schematic is shown as
. The default LED current is set at 350mA. By proper
setting the resistor values of RIADJ and RVREF (They are not in place but solder pads are reserved), the
LED current can be adjusted from 300mA to 450mA, please refer to
LED current can be adjusted from 300mA to 450mA, please refer to
and
for their setting
values. The evaluation board is tested and passes radiated emissions standards (EN55015), please refer
to
to
,
,
, and
for the performance.
NOTE:
the COUT capacitor (2.2µF) on board is critical to suppress the Electro Magnetic
Interference(EMI) for the performance as shown.
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1
SNVA640A – May 2012 – Revised May 2013
AN-2208 TPS92550 450mA 36V LED Driver Micro-Module Evaluation Board
Copyright © 2012–2013, Texas Instruments Incorporated