Datasheet

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1 Applications
Notebook and Monitor LCD display backlight
2 TPS61183EVM-528 Electrical Performance Specifications
Table 1 provides a summary of the TPS61183EVM-528 performance specifications. All specifications are
given for an ambient temperature of 25°C.
Table 1. TPS61183EVM-528 Electrical and Performance Specifications
Parameter Notes and Conditions
(1)
Min Typ Max Unit
INPUT CHARACTERISTICS
V
IN
Input Voltage 4.5 24 V
En EN Logic high 2.1 20 V
PWM PWM Logic high 2.1 20 V
I
q_VIN
Input quiescent Current Device enable, switching 600 KHz and no load, V
IN
= 21 V 4 mA
V
IN
ramp down 3.50
V
IN_UVLO
Input UVLO V
V ramp up 3.75
OUTPUT CHARACTERISTICS
J6 connected to 10 WLED configured WLEDEVM-260, JP5 32 38 V
V
OUT
V(TP2)
shorted, JP6-13 shorted, EN/PWM =VDDIO, SEL=open
I
OUT
I(JP1) =6 X IFBx V
IN
= Min to Max, R1 = 62k 120 mA
SYSTEMS CHARACTERISTICS
F
S
Switching Frequency R
FSW
= 499K 0.8 1 1.2 MHz
(1)
The user can estimate the input current by solving the power balance equation, eff = P
OUT
/P
IN
= (V
O
× I
O
)/(V
IN
× I
IN
), for I
IN
and
estimating the efficiency to be a conservative 85%. For example, for V
O
= 32V, V
IN
= 5V and I
O
= 6 × 20mA = 120mA, I
IN
= (32V
× 120mA)/(5V × 0.85) = 0.904A
3 Modifications
See the datasheet (SLVSAB4) when changing components such as R1 to set the LED current or R4 and
R5 to set the OVP threshold. To aid in such customization of the EVM, the board was designed with
devices having 0603 or larger footprints. A real implementation likely occupies less total board space.
Note that changing components can improve or degrade EVM performance. For example, using inductors
with larger dc resistances lowers the dc/dc conveter's efficiency.
4 Connector and Test Point Descriptions
4.1 Input/Output Connections
The connections points are described in the following paragraphs.
4.1.1 J1 – VIN
This header is the positive connection to the input power supply. Twist the input supply and GND leads to
the input supply and keep them as short as possible.
4.1.2 J2 – S+/S-
This header provides connection for the positive and negative sense leads for some power supplies.
Connecting sense will help ensure proper regulation of the input voltage.
4.1.3 J3 – GND
This header is the return connection to the input power supply.
2
TPS61183EVM-528 SLVU363–July 2010
Copyright © 2010, Texas Instruments Incorporated