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參數(shù)資料
| 型號： | LP3933SL |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs |
| 中文描述： | LED DISPLAY DRIVER, QCC32 |
| 封裝： | 4.50 X 5.50 MM, 0.80 MM HEIGHT, 0.50 MM PITCH, CSP-32 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大小： | 406K |
| 代理商： | LP3933SL |
RGB Driver Electrical Characteristics
(R1, G1, B1, R2, G2, B2 outputs)
Symbol
R
DS-ON
I
LEAKAGE
I
MAX
T
SMAX
T
SMIN
T
SRES
T
START/STOP
Duty
T
BLINK
D
CYCF
D
CYC
D
RESF
D
RES
F
PWMF
F
PWM
Parameter
Conditions
Min
Typ
3.5
0.03
Max
6
1
120
Units
μA
mA
s
ms
ms
s
%
%
%
%
%
%
kHz
kHz
ON Resistance
Off State Leakage Current
Maximum Sink Current
Maximum Slope Period
Minimum Slope Period
Slope Resolution
Start/Stop Resolution
Duty Step Size
Blinking Cycle Accuracy
Duty Cycle Range
Duty Cycle Range
Duty Resolution
Duty Resolution
PWM Frequency
PWM Frequency
I = 75 mA
V
FB
= 5V, LED driver off
(Note 5)
At Maximum Duty Setting
At Maximum Duty Setting
At Maximum Duty Setting
Cycle 1s
0.93
31
62
1/16
6.25
±
3
6
0
0
+6
99.6
33.2
FLASH_MODE = 1
FLASH_MODE = 0
FLASH_MODE = 1 (4 bit)
FLASH_MODE = 0 (4 bit)
FLASH_MODE = 1
FLASH_MODE = 0
6.64
2.21
20
6.67
RGB LED PWM Control
(Note 15)
R1DUTY[3:0]
G1DUTY[3:0]
B1DUTY[3:0]
R2DUTY[3:0]
G2DUTY[3:0]
B2DUTY[3:0]
R1SLOPE[3:0]
G1SLOPE[3:0]
B1SLOPE[3:0]
R2SLOPE[3:0]
G2SLOPE[3:0]
B2SLOPE[3:0]
R1ON[3:0]
G1ON[3:0]
B1ON[3:0]
R2ON[3:0]
G2ON[3:0]
B2ON[3:0]
R1OFF[3:0]
G1OFF[3:0]
B1OFF[3:0]
R2OFF[3:0]
G2OFF[3:0]
B2OFF[3:0]
DUTY sets the brightness of the LED by adjusting the duty cycle of the PWM driver. The minimum duty
cycle is 0% [0000] and the maximum in the FLASH mode is
A
100% [1111] of the peak pulse current.
The peak pulse current is determined by the external resistor, LED voltage drop and the boost voltage. In
normal mode the maximum duty cycle is 33%.
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 [0111] the sloping time is 14 ms [0000] to 434 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 = 0–15) sets the on-time to N/16 * cycle length.
OFF sets the beginning time of the turn-off slope. Off-time is relative to the blinking cycle length in the
same way as the on-time.
If
ON = 0, OFF = 0
and
RGB_PWM = 1
, then RGB outputs are continuously on (no blinking), the DUTY
setting controls the brightness and the SLOPE setting is ignored.
If ON and OFF are the same, but not 0, the RGB outputs are turned off.
CYCLE sets the blinking cycle: [00] for 0.25s, [01] for 0.5s, [10] for 1s and [11] for 2s. CYCLE effects to
all RGB LEDs.
CYCLE[1:0]
L
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| LP3936 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Lighting Management System for Six White LEDs and One RGB or FLASH LED |
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