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參數(shù)資料
| 型號(hào)： | LP5527TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| 中文描述： | LED DISPLAY DRIVER, PBGA30 |
| 封裝： | 2.5 X 3 MM, 0.60 MM HEIGHT, BGA-30 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大小： | 829K |
| 代理商： | LP5527TLX |
Constant Current Sink Outputs LED1, LED2, LED3, LED4
LP5527 has four independent backlight/keypad LED drivers.
All the drivers are regulated constant current sinks. LED
currents are controlled by 8-bit current mode DACs. Every
driver can be controlled in two ways:
1.
Brightness control with constant current drivers
2.
Direct ON/OFF control. The current is pre-set by 8-bit
current mode DAC.
In addition, LED1 driver can be synchronized to audio input
signal amplitude.
By using brightness control user can set brightness of every
single LED by using 8-bit brightness control registers. If
analog audio is available on system the user can use audio
synchronization for synchronizing LED1 to the music. Direct
ON/OFF control is mainly for switching LEDs on and off.
LED Control Register (00 hex) has control bits for direct
on/off control of all the LEDs. Note that the LEDs have to be
turned on in order to control them with audio synchronization
(LED1 only) or brightness control.
The brightness is programmed as described in the following.
I
LED
= n x (15 mA / 255)
where:
n = LED[7:0] (8-bit)
step = 15 mA / 255
≈
0.05882 mA
For example if 13.2 mA is required for driver current:
n = 13.2 mA / (15 mA / 255)
≈
224
224 = 1110 0000, E0 hex
LED1 to LED4 Brightness Control
LED1[7:0], LED2[7:0] LED3[7:0], LED4[7:0] Register
0000 0000
0000 0001
0000 0010
1110 0000
1111 1110
1111 1111
Driver Current, mA (typical)
0
0.059
0.118
13.176
14.941
15
LED1 TO LED4 DRIVERS ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for T
J
= 25
o
C. Limits in
boldface
type apply over the operating ambient temperature range (-30
o
C
<
T
<
+85
o
C). Unless otherwise noted, specifications apply to the LP5527 Block Diagram with: V
IN
= 3.6V, C
IN
= 10 μF, C
= 10 μF, C
OUT2
= 10 μF, C
VDDIO
= 100 nF, C
VREF
= 100 nF, C
VDDA
= 4.7 μF, C
VDD1
= 100 nF, C
VDD2
= 100 nF, L
1
= 4.7 μH. (Note
9)
Symbol
I
MAX
I
LEAKAGE
I
LED
Parameter
Maximum Sink Current
Leakage Current
Current Tolerance
Condition
Min
Typical
Max
Units
mA
μA
mA
15
0.03
13.2
V
FB
= 5.0V
I
SINK
=13.2 mA (target value)
11.9
-10
14.5
+10
%
%
I
MATCH
Sink Current Matching
Between LED 1 to 4
Saturation Voltage
I
SINK
=13.2 mA
1
V
SAT
3.0V
≤
V
IN
≤
5.5V, Current Decreased
to 95% of the Maximum Sink Current
150
230
mV
Note:
Sink current matching is the maximum difference from the average.
L
www.national.com
12
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