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TPS61059DRCR Datasheet(PDF) 15 Page - Texas Instruments

No. de pieza TPS61059DRCR
Descripción Electrónicos  SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER
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Fabricante Electrónico  TI [Texas Instruments]
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TPS61059DRCR Datasheet(HTML) 15 Page - Texas Instruments

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R
S +
V
SENSE
I
LED
+
0.75
0.5
+ 1.5 W
V
OUT(MAX) +
4.4 ) 0.75 + 5.15 V
(9)
I
LED(FLASH) [
R2 ) R3
2
R3
R
S
R3 + 100 kW (recommended value)
R2 + 47 kW (calculated)
(10)
Vx [
1
2
)
R3
2
R2
* ILED
R3
R
S
R2
V
X +
1.1 V @ I
LED +
150 mA (movie−light)
V
X +
1.4 V @ I
LED +
45 mA (pre−load)
(11)
Vx [
R5
R4 ) R5
nFLASH
R5
R4 ) R5
+ 0.78
R5 + 10 kW (recommended value)
R4 + 2.7 kW (calculated)
(12)
Vx [
R5
R4 ) R5
nFLASH
R5
R4 ) R5
+ 0.61, R5 + 1.57
R4, R5 +
R5
R6
R5 ) R6
R6 + 7.5 kW (calculated)
(13)
IOK
M1
R4
nFLASH
R3
R2
RS
ILED
V X
VSENSE
R6
R5
IBIAS
FB = 500 mV
TPS61058
TPS61059
SLVS572B – APRIL 2005 – REVISED DECEMBER 2005
The following example is used to explain the procedure to size the external components for a given set of
requirements:
Movie-light mode: I
LED = 150 mA
Flashlight mode: I
LED = 500 mA
LED forward voltage: V
F (MAX) = 4.4 V at 500 mA
nFLASH signal is 1.8 V logic compliant (0 V and 1.8 V
±4%)
Step 1 – Current Sense Resistor Calculation – RS
Step 2 – Feedback Divider Resistor Calculation – R2, R3
Step 3 – Bias Resistor Network Calculation – R4, R5, R6
During the pre-charge phase, IOK is high impedance.
In movie-light mode, IOK is grounded.
Figure 19. Feedback Network Equivalent Circuit
15


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