參數(shù)資料
型號(hào)： LP3950SL
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 顯示驅(qū)動(dòng)器
英文描述： Color LED Driver with Audio Synchronizer
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)： 17/31頁
文件大?。?/td> 1085K
代理商： LP3950SL
Programmable Pattern Mode
(Continued)
RGB Driver Characteristics
(R1, G1, B1, R2, G2, B2 outputs). Limits in standard typeface are for T
J
= +25C. Limits in
boldface
type apply over the oper-
ating ambient temperature range (40C
≤
T
A
≤
+85C).
Symbol
Parameter
Conditions
R
DS-ON
ON Resistance
I
LEAKAGE
Off State Leakage Current
V
FB
= 5.0V, LED driver off
t
SMAX
Maximum Slope Period
At Maximum Duty Setting
t
SMIN
Minimum Slope Period
At Maximum Duty Setting
t
SRES
Slope Resolution
At Maximum Duty Setting
t
START/STOP
Start/Stop Resolution
Cycle 1.0s
Duty
Duty Step Size
t
BLINK
Blinking Cycle Accuracy
D
CYCF
Duty Cycle Range
EN_FLASH = 1
D
CYC
Duty Cycle Range
EN_FLASH = 0
D
RESF
Duty Resolution
EN_FLASH = 1 (4-bit)
D
RES
Duty Resolution
EN_FLASH = 0 (4-bit)
f
PWMF
PWM Frequency
EN_FLASH = 1
f
PWM
PWM Frequency
EN_FLASH = 0
Min
Typ
3.5
0.03
0.93
31
62
1/16
1/16
±
3
Max
6.0
1.0
Units
μA
s
ms
ms
s
6
0
0
+6
99.6
33.2
%
%
%
%
%
kHz
kHz
6.64
2.21
20
6.67
RGB LED PWM Control
(Note 17)
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 is 0% [0000] and the maximum in the flash mode is
A
100% [1111]. The peak pulse current is
determined by the external resistor, LED forward voltage drop and the boost voltage. In the 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 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.
RSLOPE[3:0]
GSLOPE[3:0]
BSLOPE[3:0]
RON[3:0]
GON[3:0]
BON[3:0]
20129326
FIGURE 14. Example Blinking Waveforms
L
www.national.com
17
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LP3952 制造商:NSC 制造商全稱:National Semiconductor 功能描述:6-Channel Color LED Driver with Audio Synchronization
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