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SM8121AH Folha de dados(PDF) 11 Page - Nippon Precision Circuits Inc

Nome de Peças SM8121AH
Descrição Electrónicos  White LED Driver IC
Download  19 Pages
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Fabricante Electrônico  NPC [Nippon Precision Circuits Inc]
Página de início  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8121AH Folha de dados(HTML) 11 Page - Nippon Precision Circuits Inc

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SM8121A
NIPPON PRECISION CIRCUITS INC.—11
Brightness adjustment using FB pin (PWM signal input)
When the brightness is controlled by PWM signal (VPWM × Duty), the LED current (ILED) is given by equa-
tion 4.
If the values R1 = 30
Ω, R2 = 20kΩ, R3 = 50kΩ, R4 = 50kΩ, VFB = 0.5V, VPWM = 3V, and Duty = 0% are
inserted in equation 4, the LED current ILED = 20mA, as shown in equation 5.
If the values R1 = 30
Ω, R2 = 20kΩ, R3 = 50kΩ, R4 = 50kΩ, VFB = 0.5V, VPWM = 3V, and Duty = 100% are
inserted in equation 4, the LED current ILED = 0mA, as shown in equation 6.
Taking the above diagram as an example, inserting the values R1 = 30
Ω, R2 = 20kΩ, R3 = 50kΩ, R4 = 50kΩ,
VFB = 0.5V, VPWM = 3V, and Duty = 0 to 100% into equation 4 gives the maximum LED current ILED of
20mA when Duty = 0% (equation 5) and the minimum LED current ILED of 0mA when Duty = 100% (equa-
tion 6).
Brightness adjustment circuit using FB pin
(PWM signal input)
SW
VSS
FB
SM8121
R1
30
SBD
R3
50k
R2
20k
VDD
CE
COUT
1.0
µF
L
10
µH
CIN
4.7
µF
VIN
3.6V
LED
R4
50k
C1
0.1
µF
PWM signal
Duty [
%]
VPWM [V]
PWM signal vs. LED current
0
5
10
15
20
0.0
0.5
1.0
1.5
2.0
2.5
3.0
VPWM
× Duty [V]
R2
× (VPWM × Duty − VFB)
R3 +R4
R1
ILED =
VFB
... (4)
30
30
ILED ==
=
20,000
× (3 × 0 − 0.5)
50,000 + 50,000
0.5
0.6
20mA
... (5)
30
30
ILED ==
=
20,000
× (3 × 1 − 0.5)
50,000 + 50,000
0.5
0
0mA
... (6)


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