Texas Instruments TPS61187EVM-528 Evaluation Module TPS61187EVM-528 TPS61187EVM-528 데이터 시트
제품 코드
TPS61187EVM-528
Applications
1
Applications
Notebook and Monitor LCD display backlight
2
TPS61183/7EVM-528 Electrical Performance Specifications
provides a summary of the TPS61183/187EVM-528 performance specifications. All specifications
are given for an ambient temperature of 25°C.
Table 1. TPS61183/7EVM-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 appropriate IC datasheet 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.
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 resistance lowers the dc/dc converter's efficiency.
with larger dc resistance lowers the dc/dc converter'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.
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.
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
User's Guide for TPS61183EVM-528 and TPS61187EVM-528
SLVU363A – July 2010 – Revised April 2012
Copyright © 2010–2012, Texas Instruments Incorporated