參數(shù)資料
型號(hào)： TPS61058DRC
廠商： Texas Instruments, Inc.
英文描述： SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER
中文描述： 同步升壓轉(zhuǎn)換器斷電模式高功率白光LED驅(qū)動(dòng)
文件頁(yè)數(shù)： 13/30頁(yè)
文件大?。?/td> 1684K
代理商： TPS61058DRC
www.ti.com
APPLICATION INFORMATION
DESIGN PROCEDURE
nFLASH
IOK
ILED
Flashlight
MOVIE-LIGHT
Hi-Z
Hi-Z
Pre-Charge
Movie-Light
GND
GND
CIN
22
μ
F
L1
PVIN
VIN
EN
SW
VOUT
FB
PGND
VIN
D1
Rs
R2
R3
R4
nFLASH
IOK
Vx
R6
R5
2.7 V . . 5.5 V
4.7
μ
H
MOVIE-LIGHT
C1, C2, C3
22
μ
F
x3
C4
1 nF (COG)
R1
22 k
V
TPS61058/9
C5
100nF
RS
VSENSE
ILED
(1)
TPS61058
TPS61059
SLVS572B–APRIL 2005–REVISED DECEMBER 2005
The standard application circuit (
Figure 17
) of the TPS61058/9 is a complete solution to drive high-power white
LEDs with two discrete current steps.
Figure 18. Waveform Profiles
Figure 17. Typical Application
The LED current is programmed using external resistors (R
S
, R2, R3, R4, R5, and R6). The first step to turn on
the LED is to enable the device (EN = High). After charging the output capacitor, the device forces IOK to
ground, starts switching, and regulates the LED current to the desired value. The control signal, nFLASH, injects
current into the feedback network through R4, thereby, changing the LED current. For this reason, the nFLASH
control signal needs at least to be biased up until IOK goes low. In case this is not done properly the converter
stays stuck in the pre-chage phase.
To faciliate the sizing of the external resistor network, it is recommended to use the calculation sheet available in
the device product folder.
1. Sense resistor, R
S
The voltage across the sense resistor should be set to approximately 0.75 V at maximum LED current.
Check the power rating of the sense resistor (P
D
= R
S
×
I
LED2
).
2. LED current setting
Figure 19
shows an equivalent circuit for the feedback network. The regulation loop is using an external
control voltage (nFLASH) to set the LED current. With the help of this voltage the feedback bias current
(I
BIAS
) can be adjusted which, in effect, controls the LED current without changing any externals.
In most applications a variable control voltage is not available to set the LED current. In practical
applications, nFLASH can either be:
A constant bias voltage (2.8 V for example) which in combination with IOK can be used to switch
between two LED currents (Off, Flashlight).
A logic signal generated by the imaging processor. This configuration permits three different LED
currents: Off, Movie-light (nFLASH = High), Flashlight (nFLASH = Low).
13
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