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參數(shù)資料
| 型號： | CAT4201TD-GT3 |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | 350mA High Efficiency Step Down LED Driver |
| 中文描述： | 350mA的高效率LED驅(qū)動下步 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大小： | 330K |
| 代理商： | CAT4201TD-GT3 |
CAT4201
Doc. No. MD-5025 Rev. B
10
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Dimming Methods
Two methods for PWM dimming control on the LEDs
are described below. The first method is to PWM on
the control pin, the other method is to turn on and off a
second resistor connected to the RSET pin and
connected in parallel with R1.
PWM on CTRL pin
A PWM signal from a microprocessor can be used for
dimming the LEDs when tied to the CTRL pin. The
duty cycle which is the ratio between the On time and
the total cycle time sets the dimming factor. The
recommended PWM frequency on the CTRL pin is
between 100Hz and 2kHz.
Figure 3. PWM at 1kHz on CTRL Pin
Figure 4. LED Current vs. Duty Cycle
Figure 5. Circuit for PWM on CTRL
PWM on RSET pin
Another dimming method is to place in parallel to R1
another resistor with a FET in series, as shown on
Figure 6. R1 sets the minimum LED current corres-
ponding to 0% duty cycle. The combined resistor of
R1 and Rmax sets the maximum LED current
corresponding to 100% duty cycle.
Figure 6. Circuit for PWM on RSET
0
50
100
150
200
250
300
0
20
40
60
80
100
DUTY CYCLE [%]
L
RSET
SW
GND
CAT4201
VBAT
VBAT
PWM
control
4.7μF
C1
10μF
C2
NPN
L
D
12V
0V
5V
CTRL
22μH
1k
R5
47k
R1
10k
R2
Q1
1k
R4
RSET
SW
GND
CAT4201
VBAT
VBAT
PWM
control
Rmax
4.7μF
C1
10μF
C2
NPN
R1
L
D
13V
CTRL
22μH
1k
R2
Q1
OFF ON
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