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参数资料
| 型号： | SIP12506DMP-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.6A MLP33-6 |
| 标准包装： | 3,000 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 20V |
| 输入电压： | 2.6 V ~ 9 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.6A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | PowerPAK? MLP33-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | PowerPAK? MLP33-6 |
Product is End of Life 3/2014
SiP12506
Vishay Siliconix
WHITE LED BRIGHTNESS CONTROL
Figures 8 and 9 delineate two possible brightness control
schemes. In Figure 8, a PWM signal is injected into the shut-
down pin. The average LED current is proportional to the
dimming brightness. Reducing V CTRL to about 0 V, will turn
the LEDs fully on with 20 mA of current. The equation for the
LED current can be expressed as
duty cycle of the PWM signal and thus, the brightness will
vary from low to high as the duty cycle of the PWM signal is
increased. The frequency of the PWM signal has to be low
I LED =
0 . 208 V
15 Ω
+
R 2
R 3
×
( 0 . 208 V - V CTRL )
15 Ω
enough to allow the part to undergo soft-start and fully power
up at each cycle. A frequency of 100 Hz to 500 Hz is, there-
MBR0530
fore, recommended. The magnitude of the PWM signal
V IN
10 μH
V OUT
should be higher than the maximum enable voltage of SHD
pin, in order to let the dimming control perform correctly.
4.7 μF
SHD
3
SHD
2
V IN
LX
1
C OUT
1 μF
MBR0530
SiP12506
2
V OUT
4
FB
10 K Ω
R3
R1
20 K Ω 15 Ω
V IN
1 μF
100 - 500 Hz
3
5
L
10 μH
V IN
SHD LX
SiP12506
FB
GND
6
1
4
C OUT
1 μF
0. 208 V
10.5 Ω
V O
R2
5
V OUT A
0.208 V
GND
6
V CTRL
Figure 9. White LED driver with adjustable brightness
Figure 10 demonstrates a more practical approach for dim-
ming control which is really the synthesis of the two ideas
demonstrated above. In this approach, a filtered PWM signal
Figure 8. SiP12506 Driving Four LEDs
In Figure 9, a more analog approach to brightness control. As
the control voltage V CTRL is increased from 0 V, the voltage
drop across R2 and R3 increases driving voltage on node A
acts as a DC voltage to control the brightness of the LEDs. It
is recommended that PWM signal with frequency higher than
22 kHz be used. Figures 11 and 12 illustrate other variations
of the previously mentioned ideas.
low thereby reducing current through the White LEDs and
MBR0530
V IN
10 μH
V OUT
4.7 μF
2
V IN
C OUT
1 μF
SHD
3
SHD
LX
1
SiP12506
5
V OUT
GND
6
FB
4
0.208 V
R3
20 K Ω
R2
10 K Ω
A
R1
15 Ω
R DC
100 K Ω
C DC
0.1 μF
PWM > 22 kHz
Figure 10. White LED driver with adjustable brightness control using a filtered PWM signal
Document Number: 73861
S-70547–Rev. D, 26-Mar-07
www.vishay.com
9
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