Moteur de recherche de fiches techniques de composants électroniques
  French  ▼

Delete All
ON OFF
ALLDATASHEET.FR

X  

Preview PDF Download HTML

AIC1648 Fiches technique(PDF) 7 Page - Analog Intergrations Corporation

No de pièce AIC1648
Description  Built-in OVP White LED Step-Up Converter
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  AIC [Analog Intergrations Corporation]
Site Internet  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC1648 Fiches technique(HTML) 7 Page - Analog Intergrations Corporation

Back Button AIC1648 Datasheet HTML 2Page - Analog Intergrations Corporation AIC1648 Datasheet HTML 3Page - Analog Intergrations Corporation AIC1648 Datasheet HTML 4Page - Analog Intergrations Corporation AIC1648 Datasheet HTML 5Page - Analog Intergrations Corporation AIC1648 Datasheet HTML 6Page - Analog Intergrations Corporation AIC1648 Datasheet HTML 7Page - Analog Intergrations Corporation AIC1648 Datasheet HTML 8Page - Analog Intergrations Corporation AIC1648 Datasheet HTML 9Page - Analog Intergrations Corporation AIC1648 Datasheet HTML 10Page - Analog Intergrations Corporation  
Zoom Inzoom in Zoom Outzoom out
 7 / 10 page
background image
AIC1648
7
PIN DESCRIPTIONS
PIN 1: SW
- Switch
pin.
Connect
inductor/diode here. Minimize
trace area at this pin to reduce
EMI.
PIN 2: GND
- Ground pin. Tie directly to local
ground plane.
PIN 3: FB
- Feedback
pin.
Reference
voltage
is
95mV.
Connect
cathode of lowest LED and
resistor here. Calculate resistor
value to obtain LED current
according to the formula:
RFB = 95mV/ILED
PIN 4: SHDN - Shutdown pin. Tie to higher than
1.5V to enable device, 0.3V or
less to disable device.
PIN 5: OVP
- Overvoltage protection. When
VOUT is greater than 27V, the
internal MOSFET turns off.
PIN 6: VIN
- Power input pin. Bypass VIN to
GND with a capacitor sitting as
close to VIN as possible.
APPLICATION INFORMATION
Inductor Selection
A 10
µH inductor is recommended for most
AIC1648 applications. Although small size and
high efficiency are major concerns, the inductor
should have low core losses at 1.2MHz and low
DCR (copper wire resistance).
Capacitor Selection
The small size of ceramic capacitors makes them
ideal for AIC1648 applications. X5R and X7R
types are recommended because they retain their
capacitance over wider ranges of voltage and
temperature than other types, such as Y5V or
Z5U. 1
µF input capacitor with 1µF output
capacitor
are
sufficient
for
most
AIC1648
applications.
Diode Selection
Schottky diodes, with their low forward voltage
drop and fast reverse recovery, are the ideal
choices for AIC1648 applications. The forward
voltage drop of an Schottky diode represents the
conduction losses in the diode, while the diode
capacitance (CT or CD) represents the switching
losses. For diode selection, both forward voltage
drop and diode capacitance need to be
considered. Schottky diodes with higher current
ratings usually have lower forward voltage drop
and larger diode capacitance, which can cause
significant switching losses at the 1.2MHz
switching frequency of AIC1648. An Schottky
diode rated at 100mA to 200mA is sufficient for
most AIC1648 applications.
LED Current Control
LED current is controlled by feedback resistor
(RFB in Figure 1). The feedback reference voltage
is 95mV. The LED current is 95mV/ RFB. In order
to have accurate LED current, precision resistors
are preferred (1% recommended). The formula for
RFB selection is shown below.
RFB = 95mV/ILED
Open-Circuit Protection
In the cases of output open circuit, when the LEDs
are disconnected from the circuit or the LEDs fail,
the feedback voltage will be zero. AIC1648 will
then switch to a high duty cycle resulting in a high
output voltage, which may cause SW pin voltage
to exceed its maximum 33V rating. Connect built-
in OVP (Over Voltage Protection) pin to output
terminal to prevent the damage resulting from an
open circuit condition.


Html Pages

1  2  3  4  5  6  7  8  9  10 


Fiches technique Télécharger

Go To PDF Page

Numéro de composants électroniques

No de pièceDescriptionHtml ViewFabricant
LT3466 Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes 1  2  3  4  5  More Linear Technology
MAX1582 High-Efficiency 26V Step-Up Converter for White LED Main and Subdisplay Backlighting 1  2  3  4  5  More Maxim Integrated Products
AIC1647 WHITE LED STEP-UP CONVERTER IN SOT23 1  2  3  4  5  More Analog Intergrations Corporation
MX841 White LED Step-Up Converter 1  2  3  4  5  More IXYS Corporation
G5121 Fixed Frequency White LED Step-Up Converter 1  2  3  4  5  More Global Mixed-mode Technology Inc
LT3465AES6 1.2MHz/2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT 1  2  3  4  5  More Linear Technology
MAX1848 White LED Step-Up Converter in SOT23 1  2  3  4  5  More Maxim Integrated Products
LM3502 Step-Up Converter for White LED Applications 1  2  3  4  5  More National Semiconductor (TI)
A8430 White LED Driver Constant Current Step-up Converter 1  2  3  4  5  More Allegro MicroSystems
LM3500 Synchronous Step-up DC/DC Converter for White LED 1  2  3  4  5  More National Semiconductor (TI)

Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn