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(yè)數(shù)： 14/31頁(yè)
文件大?。?/td> 1085K
代理商： LP3950SL
Magnetic Boost DC/DC Converter Electrical Characteristics
(Continued)
Limits in standard typeface are for T
= +25C. Limits in
boldface
type apply over the operating ambient temperature range
(40C
≤
T
A
≤
+85C). Unless otherwise noted, specifications apply to
Figure 1
with: V
= V
DD2
= V
= 2.8V, C
=
C
VDD2
= C
VDDA
= C
VDDIO
= 100 nF, C
OUT
= C
IN
= 10 μF, C
VREF
= 100 nF, L
1
= 4.7 μH and f
BOOST
= 2.0 MHz (Note 12).
Symbol
Parameter
Conditions
RDS
ON
Switch ON Resistance
V
DD1,2
= 2.8V, I
SW
= 0.5A
f
PWF
PWM Mode Switching
Frequency
freq_sel[2:0] = 1XX
Frequency Accuracy
2.7
≤
VDD
1,2
≤
2.9
RT = 82 k
t
PULSE
Switch Pulse Minimum
Width
t
STARTUP
Startup Time
I
CL_OUT
SW Pin Current Limit
Min
Typ
0.4
Max
0.7
Units
RT = 82 k
2.0
MHz
6
9
±
3
+6
+9
%
No Load
25
ns
15
800
ms
700
500
900
1000
mA
Boost Standby Mode
User can set the boost converter to STANDBY mode by writing the register bit EN_BOOST low when there is no load to avoid
idle current consumption. When EN_BOOST is written high, the converter starts in PFM (Pulse Frequency Modulation) mode for
10 ms and then goes to PWM (Pulse Width Modulation ) mode. All RGB outputs are off during the 10 ms delay.
Boost Output Voltage Control
User can control the boost output voltage by eight-bit boost output voltage register according to the following table.
BOOST[7:0]
Register 0D’h
Binary
0000 0000
0000 0001
0000 0011
0000 0111
0000 1111
BOOST Output
Voltage
(typical)
Hex
00
01
03
07
0F
4.10
4.25
4.40
4.55
4.70
BOOST[7:0]
Register 0D’h
Binary
0001 1111
0011 1111
0111 1111
1111 1111
BOOST Output
Voltage
(typical)
Hex
1F
3F
7F
FF
4.85
5.00 Default
5.15
5.30
Boost Frequency Control
The register ‘boost frequency’ has address 0C’h. The default value after reset is 07’h. ‘x’ means don’t care.
FREQ_SEL[2:0]
1xx
01x
Frequency
2.00 MHz
1.67 MHz
FREQ_SEL[2:0]
001
Frequency
1.00 MHz
L
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