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TPS61160DRVTG4 Datasheet(PDF) 23 Page - Texas Instruments

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Part # TPS61160DRVTG4
Description  White LED Drivers With Digital and PWM Brightness Control in 2-mm x 2-mm WSON Package
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61160DRVTG4 Datasheet(HTML) 23 Page - Texas Instruments

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background image
FLTR
pwm
FLTR
1
1
C
=
2 (R
// R )
10
f
p
2 L ED(ma x)
PW M(max)
FB
LED(min)
PW M(min)
FB
PWM(max)
PWM(min)
1
FLTR
FB LED(max)
LED(min)
LE D(max)
LED(min)
R (I
(V
V
)
I
(V
V
))
V
V
R + R
=
+
V
(I
I
)
I
I
-
-
-
-
-
-
(
)
FB
PWM(max)
PWM(min)
SET
P WM(ma x) LE D(max)
FB LED(max)
FB L ED(min )
PWM(min) L ED(min )
V
V
V
R
=
V
I
V I
+ V I
V
I
-
-
P WM(ma x)
(ma x) PWM(H)
(max)
PWM(L)
V
= D
V
+ (1
D
)V
-
PWM(min )
(min) P WM(H)
(min)
PWM(L )
V
= D
V
+ (1
D
)V
-
FLTR
)
L
(
PWM
)
H
(
PWM
FLTR
FB
FB
R
R
V
)
D
(
V
D
R
//
)
R
R
(
V
I
error
%
+
-
+
´
-
+
=
1
2
1
1
23
TPS61160, TPS61161
www.ti.com
SLVS791E – NOVEMBER 2007 – REVISED JULY 2016
Product Folder Links: TPS61160 TPS61161
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
8.2.2.1 Design Requirements
Example parameters for white LEDs with external PWM dimming:
Table 5. Design Parameters for White LEDs with External PWM Dimming
DESIGN PARAMETER
EXAMPLE VALUE
Inductor
10 µH
Minimum input voltage
3.6 V
Number of series LED
6
LED maximum forward voltage (Vf)
3.2 V
Schottky diode forward voltage (Vf)
0.2 V
Efficiency
90%
Switching frequency (fSW)
600 kHz
External PWM output voltage
3 V
External PWM frequency
20 kHz
Applying Equation 3 and Equation 4 when VIN is 3 V, 6 LEDs output equivalent to VOUT of 19.4 V, the inductor is
10 μH, the Schottky forward voltage is 0.2 V, the maximum output current is 76 mA in typical condition.
8.2.2.2 Detailed Design Procedure
8.2.2.2.1
Choosing Component Values
As per SLVA471, the values of RFLTR, CFLTR, R1, R2, and RSET are determined by the system parameters and
error tolerance. The main source of LED current error is leakage current from the FB pin. The error gets worse
as the LED current decreases. The error due to leakage current is given by Functional Block Diagram, where the
impedance seen by the FB pin has a major impact. To reduce error due to the leakage current, the impedance
seen by the FB pin needs to be small. Because R2 is much smaller than R1 + RFLTR, R2 must be chosen to be
small to minimize the impedance seen by the FB pin. In general, R2 must be chosen to be 1 kΩ or less. If greater
accuracy at smaller currents is needed, then R2 must be chosen to be even smaller.
(8)
Once R2 has been chosen, the value of RSET and R1 + RFLTR can be calculated using Equation 9, Equation 10,
Equation 11, and Equation 12. The individual values of R1 and RFLTR can be any combination that sums up to R1
+ RFLTR . In general, choosing R1 and RFLTR to be the same value gives a minimum requirement for CFLTR.
(9)
(10)
(11)
(12)
Finally, CFLTR can be chosen based on the amount of filtering desired or to provide a gradual dimming effect that
is popular in many lighting products. At a minimum, CFLTR must be chosen to provide at least 20 dB of
attenuation at the PWM frequency. Equation 13 can be used to calculate the minimum capacitor value to provide
this attenuation.
(13)


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