參數(shù)資料
型號(hào)： AIC1648PGTR
廠商： Analog Integrations Corporation
英文描述： Built-in OVP White LED Step-Up Converter
中文描述： 內(nèi)置過壓保護(hù)白光LED轉(zhuǎn)換器升壓型
文件頁數(shù)： 7/10頁
文件大?。?/td> 275K
代理商： AIC1648PGTR
AIC1648
7
PIN 1: SW
- Switch
inductor/diode here. Minimize
trace area at this pin to reduce
EMI.
- Ground pin. Tie directly to local
ground plane.
- Feedback
pin.
voltage
is
95mV.
cathode of lowest LED and
resistor here. Calculate resistor
value to obtain LED current
according to the formula:
R
FB
= 95mV/I
LED
pin.
Connect
PIN 2: GND
PIN 3: FB
Reference
Connect
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.
Inductor Selection
A 10
μ
H 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
μ
F input capacitor with 1
μ
F 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 (C
T
or C
D
) 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
(R
FB
in Figure 1). The feedback reference voltage
is 95mV. The LED current is 95mV/ R
FB
. In order
to have accurate LED current, precision resistors
are preferred (1% recommended). The formula for
R
FB
selection is shown below.
R
FB
= 95mV/I
LED
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.
相關(guān)PDF資料
PDF描述
AIC1648XXXX Built-in OVP White LED Step-Up Converter
AIC1650CS 3-Cell, High-Efficiency, Inverting DC/DC Converter
AIC1650 3-Cell, High-Efficiency, Inverting DC/DC Converter
AIC1650CN 3-Cell, High-Efficiency, Inverting DC/DC Converter
AIC1652 CMOS Hex Non-Inverting Buffer/Converter 16-SOIC -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AIC1648XXXX 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter
AIC1650 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-Cell, High-Efficiency, Inverting DC/DC Converter
AIC1650CN 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-Cell, High-Efficiency, Inverting DC/DC Converter
AIC1650CS 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-Cell, High-Efficiency, Inverting DC/DC Converter
AIC1652 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:MICROPOWER INVERTING DC/DC CONVERTER
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