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參數(shù)資料
| 型號： | MBI5170CD |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-Bit Constant Current LED Sink Driver with Gain Control |
| 中文描述： | 8位恒流增益控制LED驅動器 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 400K |
| 代理商： | MBI5170CD |
MBI5170 8-Bit Constant Current LED Sink Driver with Gain Control
l
CG: the total Current Gain is defined as the following.
August 2004, VA.00
- 19 -
V
R-EXT
= 1.25Volt * VG
I
rext
= V
R-EXT
/ R
ext
if another end of the external resistor R
ext
is connected to ground.
I
out
= I
rext
* 15 * 3^(CM-1) = 1.25Volt / R
ext
* VG * 15 * 3^(CM-1) = (1.25Volt / R
ext
* 15) * CG
We define CG = VG * 3^(CM-1). Hence CG = (1/12) ~ (127/128) and it is divided into 256 steps, totally. If
CG = 127/128 = 0.992, the I
out
-R
ext
relationship is similar to that in MBI5168.
For example,
a) When the Configuration Code {CM, HC, CC[0:5]} = {1,1,111111},
VG = 127/128 = 0.992; and CG = VG * 3^0 = VG = 0.992
b) When the Configuration Code is {1,1,000000},
VG = (1+0)*(1+0/64)/4 = 1/2 = 0.5; and CG = 0.5
c) When the Configuration Code is {0,0,000000},
VG = (1+0)*(1+ 0/64)/4 = 1/4; and CG = (1/4)*3^-1 = 1/12
After power on, the default value of the Configuration Code {CM, HC, CC[0:5]} is {1,1,111111}. Thus, VG = CG =
0.992. The relationship between the Configuration Code and the Current Gain CG is shown in the following.
Current Gain CG v.s. Configuration Code in Binary Format
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
{
Configuration Code {CM,HC,CC[0:5]} in Binary Format
C
HC = 0 (Low
Voltage SubBand)
CM=1 (High Current Multiplier)
HC = 0 (Low
Voltage SubBand)
HC = 1 (High
Voltage SubBand)
HC = 1 (High
Voltage SubBand)
CM =0 (Low Current Multiplier)
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