參數(shù)資料
型號(hào)： LP3936
廠商： National Semiconductor Corporation
英文描述： Lighting Management System for Six White LEDs and One RGB or FLASH LED
中文描述： 照明管理系統(tǒng)6個(gè)白光LED和一個(gè)RGB或閃光燈LED
文件頁(yè)數(shù)： 16/20頁(yè)
文件大?。?/td> 520K
代理商： LP3936
RGB LED Driver
(Continued)
In the FLASH mode all the outputs are controlled in one
phase and the PWM period is 50 μs. The time averaged
FLASH mode current is three times the normal mode current
at the same DUTY value.
Blinking can be controlled separately for each output. On
and OFF times determine, when a LED turns on and off
within the blinking cycle. When both ON and OFF are 0, the
LED is on and doesn’t blink. If ON equals OFF but is not 0,
the LED is permanently off.
20081429
Example Blinking Waveforms
RGB Driver Electrical Characteristics
(R
OUT
, G
OUT
, B
OUT
outputs)
Symbol
Parameter
R
DS-ON
ON Resistance
I
LEAKAGE
Off State Leakage Current
I
MAX
Maximum Sink Current
T
SMAX
Maximum Slope Period
T
SMIN
Minimum Slope Period
T
SRES
Slope Resolution
T
START/STOP
Start/Stop Resolution
Duty
Duty Step Size
T
BLINK
Blinking Cycle Accuracy
D
CYCF
Duty Cycle Range
D
CYC
Duty Cycle Range
D
RESF
Duty Resolution
D
RES
Duty Resolution
F
PWMF
PWM Frequency
F
PWM
PWM Frequency
Conditions
Min
Typ
2
0.04
Max
4.5
1
120
Units
μA
mA
s
ms
ms
s
V
FB
= 5.3V
(Note 12)
Maximum Duty Setting
Maximum Duty Setting
Maximum Duty Setting
Cycle 1s
0.93
31
62
1/16
1/16
±
3
6
0
0
+6
94
31
%
%
%
%
%
kHz
kHz
EN_FLASH = 1
EN_FLASH = 0
EN_FLASH = 1 (4-bit)
EN_FLASH = 0 (4-bit)
EN_FLASH = 1
EN_FLASH = 0
6.27
2.09
20
6.67
Note 12:
The total load current of the boost converter should be limited to 250 mA.
RGB LED PWM Control
(Note 13)
RDUTY[3:0]
GDUTY[3:0]
BDUTY[3:0]
DUTY sets the brightness of the LED by adjusting the duty cycle of the PWM driver. The minimum DUTY
cycle [0000] is 0% and the maximum [1111] in the Flash mode is
A
94% and in the normal mode 31% of
the peak pulse current. The peak pulse current is determined by the external resistor, LED forward
voltage drop and the boost voltage.
SLOPE sets the turn-on and turn-off slopes. Fastest slope is set by [0000] and slowest by [1111]. SLOPE
changes the duty cycle at constant, programmable rate. For each slope setting the maximum slope time
appears at maximum DUTY setting. When DUTY is reduced, the slope time decreases proportionally. For
example, in case of maximum DUTY, the sloping time can be adjusted from 31 ms [0000] to 930 ms
[1111]. For 50% DUTY [1000] the sloping time is 17 ms [0000] to 496 ms [1111]. The blinking cycle has
no
effect on SLOPE.
ON sets the beginning time of the turn-on slope. The on-time is relative to the selected blinking cycle
length. On-setting N (N = 0–127) sets the on-time to N/128 * cycle length.
RSLOPE[3:0]
GSLOPE[3:0]
BSLOPE[3:0]
RON[6:0]
GON[6:0]
BON[6:0]
ROFF[6:0]
GOFF[6:0]
BOFF[6:0]
OFF sets the beginning time of the turn-off slope. Off-time is relative to blinking cycle length in the same
way as on-time.
L
www.national.com
16
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LP3936SLX 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
LP3936SLX/NOPB 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
LP3937ILQ-AL 制造商:Texas Instruments 功能描述:Electronic Component
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