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PDF A708 Data sheet ( Hoja de datos )
| Número de pieza | A708 | |
| Descripción | 3 CHANNELS 20mA ADVANCED CURRENT REGULATOR | |
| Fabricantes | ADDtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A708 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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A708
3 CHANNELS 20mA
ADVANCED CURRENT REGULATOR
DESCRIPTION
The A708 is a 3 channels 20mA advanced current
regulator for driving LEDs. Only bypass capacitor is
required and the noise is very low. The special circuit
design provides over 90% efficiency because of the very
low dropout voltage.
Target end applications are LED backlights for color
LCD display, such as mobile phone, smart phone, PDA,
notebook, and monitor, etc.
FEATURES
Fixed 20mA DC constant sink current.
Individual current sink circuit for each LED
string to prevent short / open circuit on LEDs.
TSOT-26 package available.
High efficiency.
Supply voltage range 2.7V ~ 12V.
Output sustaining voltage up to 17V.
0.1uA standby current.
2KV HBM ESD protection.
Advanced Bi-CMOS process.
TYPICAL APPLICATION CIRCUIT
VLED+
CBP
APPLICATIONS
Small Size Color LCD Backlights.
Mobile Phone, Smart Phone.
LED Backlight for Portable DVD, NB, Monitors,
and UMPC.
PACKAGE PIN OUT
VDD
CIN
Enable
LED1 LED2 LED3
VDD
A708
EN
GND
VDD 1
GND 2
EN 3
6 LED1
5 LED2
4 LED3
A708
TSOT-26
TA (°C)
-40 ~ 85
Y
ORDER INFORMATION
Plastic TSOT-26
6-pin
A708YFT
Note: The letter ”F” is marked for Lead Free process, and letter “T” is marked for Tape & Reel.
Copyright © 2007 ADDtek Corp.
1
DD076_A -- AUGUST 2007
1 page  
www.DataSheet4U.com
A708
APPLICATION INFORMATION
Enable
Pulling the EN pin to high will enable the device sinking constant current on LED pins. Pulling the EN pin to
ground will shutdown the device. This pin should not be left floating and need to be terminated.
LED Number in the String Driven by Each Channel
The breakdown voltage of LEDn pin is 17V so that each channel can drive up to 9 pcs of LEDs in series. When
the chip is disabled, the forward voltage of the LED may drop to half of the rated value because of the extremely small
leakage current.
LED Brightness Control
The LED sink current was fixed at 20mA. Apply PWM signal to EN pin and control the duty that could control
the LED brightness from 0% to maximum.
VIN
CBP
VDD
CIN
Enable
LED1 LED2 LED3
VDD
A708
EN
GND
Efficiency
The ACR (Advanced Current Regulator) architecture offers ultra low output dropout that significantly improves
the efficiency compared to Inductive Boost type or Capacitor Charge Pump type LED driver. The system efficiency,
defined as the ratio between the LEDs power and the input supplied power, is:
Efficiency = (VF1 × ILED1 + VF2 × ILED2 + VF3 × ILED3 ) / ( VDD × IDD )
Where, VF is the forward voltage of LED.
Copyright © 2007 ADDtek Corp. 5 DD076_A -- AUGUST 2007
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet A708.PDF ] | |
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