|
|
PDF AAT3129 Data sheet ( Hoja de datos )
| Número de pieza | AAT3129 | |
| Descripción | High Efficiency 1X/1.5X/2X Charge Pump | |
| Fabricantes | AAT | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AAT3129 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
|
No Preview Available !
AAT3129
High Efficiency 1X/1.5X/2X Charge Pump
for RGB Color LED Applications
General Description
Features
ChargePump™
The AAT3129 is a high efficiency charge pump
DC/DC converter with tri-mode load switch (1X)
• VIN Range: 2.7V to 5.5V
• Common Anode RGB LED Control
fractional (1.5X) and doubling (2X) conversion for
• 4096 Color with Single Wire Digital Control
color LED applications. A single current source out-
• 40mA to 180mA Fixed Current Source
put provides a regulated current to drive R, G, and
• AS2Cwire Digital Brightness Control
B LEDs via three internal switches. With a simple
• Low Noise Constant Frequency Operation
single wire serial bus, the RGB module can be eas-
• Small Application Circuit
ily controlled to display 4096 colors.
• Regulated Output Current
AnalogicTech's Advanced Simple Serial Control™
(AS2Cwire™) serial digital input is used to enable,
disable, and set the duty cycle of each internal
MOSFET switch. Low external parts count (two
• No Inductors
• 1MHz Switching Frequency
• IQ <1μA in Shutdown
• 12-Pin TSOPJW Package
1μF flying capacitors and two small bypass capac-
itors at VIN and OUT) makes the AAT3129 ideally
suited for small battery-powered applications.
The AAT3129 has a thermal management system
Applications
to protect the device in the event of a short-circuit
condition on any of the output pins. Built-in soft-
start circuitry prevents excessive inrush current
during start-up. High switching frequency enables
the use of small external capacitors. A low current
www.DataSheet4U.com
shutdown feature disconnects the load from VIN
and reduces quiescent current to less than 1μA.
•
•
•
•
•
•
•
Fashion RGBs
Mobile Handsets
MP3 Players
PDAs
Portable Devices
RGB Color LEDs
RGB Photo Flash
The AAT3129 is available in a Pb-free, 12-pin
• Smart Phones
TSOPJW package.
Typical Application
VIN ISRC
C1+
VBAT
CIN CP
C1
1μF
AAT3129
1μF
CCP
1μF
C1-
C2+
RG B
C2
1μF
C2-
EN/SET
EN/SET
DR
DG
DB
GND
3129.2007.01.1.4
1
1 page  
AAT3129
High Efficiency 1X/1.5X/2X Charge Pump
for RGB Color LED Applications
Typical Characteristics
EN/SET
(2V/div)
CP
(2V/div)
IISRC
(50mA/div)
Turn-On to 1X Mode
(VIN = 4.2V; ISRC = 60mA)
100μs/div
EN/SET
(2V/div)
CP
(2V/div)
IISRC
(50mA/div)
Turn-On to 1.5X Mode
(VIN = 3.6V; ISRC = 60mA)
100μs/div
EN/SET
(2V/div)
CP
(2V/div)
IISRC
(50mA/div)
Turn-On to 2X Mode
(VIN = 2.8V; ISRC = 60mA)
100μs/div
EN/SET
(2V/div)
VISRC
(2V/div)
IISRC
(50mA/div)
Turn-Off from 1.5X Mode
(VIN = 3.6V; Addr = 2; Data = 16)
100μs/div
3129.2007.01.1.4
5
5 Page 
AAT3129
High Efficiency 1X/1.5X/2X Charge Pump
for RGB Color LED Applications
Color Registers R, G, and B
The individual color brightness is set using the
three R, G, and B registers. The data register con-
tents determine the on-time for each color channel
during a PWM cycle. The first level is 0, or off, and
is set with a single EN/SET rising edge. This setting
eliminates a given color from the spectrum. The
remaining 15 levels progressively increase the
brightness for a particular color by increasing that
channel’s on-time. Using the red channel as an
example, the resulting on-time is
on-time = (R - 1) · 128μs
where R is the data setting (from 1 to 16). The
same applies to G and B.
Intensity Register T
The overall intensity level is set by the T register.
Once a particular mixing of colors is set to produce
the desired color, the overall intensity can be
adjusted while keeping constant the ratio of colors
to one another. The brightest level is set by pro-
gramming the T register with 1 edge. Programming
the T register with 16 edges produces the dimmest
setting. The T register adjusts the overall intensity
by controlling the PWM off-time. Under the
dimmest setting, the off-time is the longest. The off-
time that results from the data in the T register is
off-time = (T - 1) · 512μs
Diode Current Timing
Red
Green
Blue
(R - 1) · 128μs
ISRC
128μs
(G - 1) · 128μs
ISRC
128μs
(B - 1) · 128μs
ISRC
(T - 1) · 512μs
ISRC
128μs
Mode Register M
The mode register determines the method of
update for the R, G, and B channels. When the
mode register is set to 1, the addressed color
updates immediately. When the mode register is
set to 2, the colors will update when the T register
is written (synchronized updating).
Under immediate updating, an addressed channel
will update as soon as new data has latched for it.
Under synchronized updating, the channels that
have been assigned new data will not update until
data for the T register latches.
By using synchronized updating, discrete changes
in color can be achieved. Synchronized updating
allows the intensity for all three colors to be updat-
ed simultaneously. All three color registers can be
loaded with new data prior to the update. Then,
upon loading the T register, all three colors will
change to their new states together. This allows a
user to transition from one mixed color to another
without having to traverse intermediate colors.
Under immediate updating color changes can only
be achieved serially, or one color at a time.
3129.2007.01.1.4
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AAT3129.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AAT3120 | 3-Channel Charge Pump | AAT |
| AAT3122 | High Efficiency 1X/1.5X Fractional Charge Pump | AAT |
| AAT3123 | High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications |  ETC |
| AAT3123A | High Efficiency 1X/1.5X Fractional Charge Pump | AAT |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |