The AAT3157 is a low noise, constant frequency charge pump DC/DC converter that uses a trimode
load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED
applications. The AAT3157 is capable of driving up to three channels of LEDs at 20mA per channel
from a 2.7V to 5.5V input.
The current sinks may be operated individually or in parallel for driving higher current LEDs. A low
external parts count (two 1µF flying capacitors and two small 1µF capacitors at VIN and VOUT) make
this part ideally suited for small, battery-powered applications. AnalogicTech's S2Cwire™ (Simple
Serial Control™) serial digital input is used to enable, disable, and set current for each LED with 16
settings down to 50µA.
The low-current mode supply current can be as low as 50µA to save power.
3. TECHNICAL BRIEF
- 27 -
Figure 3-5-3. Charge pump Output Current
Signals
Description
CS3
This signal enable to access to the driver IC of LCD.
SSC0_MTSR
This signal transfer serial data to driver IC.
SSC0_CLK
This signal transfer serial clock to driver IC.
LCD_RESET
This signal makes driver IC to HW default status.
MLED
This signal provide power to white LEDs.
MLED1/2
This signal be feed back from white LEDs.
2V8_VIO
This signal provides power to LCD modules.(2.8V)
Data
Output (mA/Ch)
Data
Output (mA/Ch)
1
20.0
9
5.0
2
17.0
10
4.2
3
14.0
11
3.4
4
12.0
12
2.8
5
10.0
13
1.0
6
8.6
14
0.5
7
7.0
15
0.1
8
6.0
16
0.05
Содержание KG270
Страница 1: ...Date April 2007 Issue 1 0 Service Manual Model KG270 MG160 Service Manual KG270 MG160 ...
Страница 3: ... 4 ...
Страница 81: ...5 DOWNLOAD 82 5 DOWNLOAD 5 1 Download Setup Configure system like figure 5 1 Figure 9 1 Download Setup ...
Страница 87: ... 88 6 BLOCK DIAGRAM 6 BLOCK DIAGRAM ...
Страница 92: ... 93 8 PCB LAYOUT ...
Страница 93: ... 94 8 PCB LAYOUT ...
Страница 104: ... 105 10 CALIBRATION 10 2 3 Click SETTING Memu 10 2 4 Setup Ezlooks menu such as the following fugure KG278 ...
Страница 106: ...10 CALIBRATION 107 10 2 7 Select MODEL 10 2 8 Click START for RF calibration 10 2 9 RF Calibration finish KG278 ...
Страница 107: ...10 CALIBRATION 108 10 2 10 Calibration data will be saved to the following folder ...
Страница 113: ... 114 ...
Страница 124: ...Note ...
Страница 125: ...Note ...