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參數(shù)資料
| 型號(hào)： | SM8120AH |
| 廠(chǎng)商： | Seiko NPC Corporation |
| 元件分類(lèi)： | LED驅(qū)動(dòng)器 |
| 英文描述： | White LED Driver IC |
| 中文描述： | 白光LED驅(qū)動(dòng)IC |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大?。?/td> | 201K |
| 代理商： | SM8120AH |
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SM8120A
NIPPON PRECISION CIRCUITS INC.—8
Brightness adjustment using FB pin (PWM signal input)
When the brightness is controlled by PWM signal (V
PWM
×
Duty), the LED current (I
LED
) is given by equa-
tion 4.
If the values R1 = 30
, R2 = 20k
, R3 = 50k
, R4 = 50k
, V
FB
= 0.5V, V
PWM
= 3V, and Duty = 0% are
inserted in equation 4, the LED current I
LED
= 20mA, as shown in equation 5.
If the values R1 = 30
, R2 = 20k
, R3 = 50k
, R4 = 50k
, V
FB
= 0.5V, V
PWM
= 3V, and Duty = 100% are
inserted in equation 4, the LED current I
LED
= 0mA, as shown in equation 6.
Taking the above diagram as an example, inserting the values R1 = 30
, R2 = 20k
, R3 = 50k
, R4 = 50k
,
V
FB
= 0.5V, V
PWM
= 3V, and Duty = 0 to 100% into equation 4 gives the maximum LED current I
LED
of
20mA when Duty = 0% (equation 5) and the minimum LED current I
LED
of 0mA when Duty = 100% (equa-
tion 6).
Brightness adjustment circuit using FB pin
(PWM signal input)
SW
VSS
FB
R1
30
SBD
R3
50k
R2
20k
VDD
CE
OUT
C
μ
F
L
22
μ
H
C
IN
4.7
μ
F
IN
V
LED
R4
50k
C1
μ
F
PWM signal
Duty [
%
]
V
PWM
[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
V
PWM
×
Duty [V]
L
R2
× (
V
PWM
×
Duty
V
FB
)
R3 +R4
R1
I
LED
=
V
FB
... (4)
30
30
I
LED
=
=
=
20,000
× (
3
× 0
0.5)
50,000 + 50,000
0.5
0.6
20mA
... (5)
30
30
I
LED
=
=
=
20,000
× (
3
×
1
0.5)
50,000 + 50,000
0.5
0
0mA
... (6)
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