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1 Introduction
This EVM contains either Texas Instruments' TPS61181 (-001 build) or TPS61182 (-002 build) or
TPS61181A (-003 build) based WLED power solution, each of which provides up to six independently
regulated current outputs using a single inductor step-up (boost) converter. The current outputs are ideal
for driving a WLED backlight in notebook/laptop computers. A separate EVM, WLEDEVM-260 (SLVU238),
contains six strings of 12 series WLEDs and connects to the TPS6118xEVM via a 14-pin ribbon cable to
simplify evaluation. The goal of these EVMs is to facilitate evaluation of the TPS6118x integrated circuit
(IC) in a typical WLED application.
1.1 Performance Specification Summary
Table 1 provides a summary of the TPS6118xEVM-259 performance specifications. All specifications are
given for an ambient temperature of 25°C.
Table 1. Typical Performance Specification Summary
CONDITION MIN TYP MAX UNITS
V
BAT
supply TPS61181, TPS61182 5 24 V
V
BAT
supply TPS61181A 4.5 24 V
EN logic high TPS61181, TPS61182 1.2 6 V
EN logic high TPS61181A 2.0 18 V
J8 connected to 10 WLED configured WLEDEVM-260, JP13 shorted, JPFBxS
30 35 V
open, V
BAT
supplied, EN = 3.3V, DCTRL = V
CC
V
(TP5)
J8 connected to 10 WLED configured WLEDEVM-260, JP13 open, JPFBxS
38 39 40
open, V
BAT
supplied, EN = 3.3V, DCTRL = V
CC
J8 connected to 10 WLED configured WLEDEVM-260, JP13 shorted, JPFBxS mA
I
(JP13)
= 6 X IFBx 116 120 124
open, V
BAT
= 5 V, V
CC
supplied, EN = 3.3V, DCTRL = V
CC
1.2 Modifications
To aid user customization of the EVM, the board was designed with devices having 0603 or larger
footprints. A real implementation likely occupies less total board space.
Changing components can improve or degrade EVM performance. For example, using inductors with
larger dc resistances lowers efficiency of the solution.
Transistor Q1, resistor R3, and diode D2 are optional but are recommended components. Transistor Q1
and resistor R3 provide input to output isolation when the IC is disabled and in the event of a fault. Diode
D2 clamps inductor L1 to 0.3 V when Q1 opens in order to protect Q1 from overvoltage.
2
TPS61181EVM-259 / TPS61182EVM-259 SLVU223B–February 2008–Revised May 2011
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