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PDF LC3300 Data sheet ( Hoja de datos )
| Número de pieza | LC3300 | |
| Descripción | Variable Frequency Step-up DC/DC Converter | |
| Fabricantes | Leadchip semi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LC3300 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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LC3300
- Max. 3MHz, Variable Frequency Step-up DC/DC Converter
DESCRIPTION
The LC3300 variable frequency step-up
Converter drives white LEDs with a constant
current to provide backlight in cell phones,
PDAs, and other hand-held devices. It
features allowing series connection of the
white LEDs so that the LED currents are
identical for uniform brightness. An enable
input can be pulsed repeatedly to adjust
LEDs brightness. The fast 3MHz operation
frequency allows for smaller capacitor and
inductor. Fault condition protection uses
cycle-by cycle current limiting to sense
maximum inductor current and over-voltage
protection. The 0.2V low reference voltage
minimized the power loss across the current
sense resistor.
FEATURES
• Up to 24V Output Voltage
• Wide Operation Range: 2V to 6V
• Maximum 3MHz Operating Frequency
• PWM Dimming Control
• Shutdown Current <1uA
• Current Limit Cycle-by-Cycle
• Low Current Sense Threshold: 200mV
• 24V Over Output Voltage Protection
• Compact SOT23-6 Package
APPLICATIONS
• Compact Back Light Module
• Power Source for LED
• Constant Current Source
The converter can operate from 2V to 6V,
and capable of delivering maximum 200mA
output current at 4-LEDs application with 3V
input voltage. Quiescent current drawn from
power source is as low as 120uA. All of these
features make LC3300 be suitable for the
portable devices, which are supplied by a
single battery.
LC3300 is available in SOT23-6 package that
is PB free.
TYPICAL APPLICATION
VIN
L1
10uH
D1
SS14
Cin
4.7uF
ON
OFF
VIN LX
OVP
LC3300
CE FB
GND
Cout
4.7uF
LED1
LED2
LED3
LED4
R1
LED17
LED18
LED19
LED20
R5
Figure1. LC3300 Typical Application Circuit
www.leadchip.com.cn
Copyright@2007, Leadchip semi
1
Your final power solution
Free Datasheet http://www.datasheet4u.com/
1 page  
LC3300
APPLICATION INFORMATION
Dimming Control
1. Using a PWM Signal to CE Pin
When adding the PWM signal to CE pin, the LC3300 is turned on or off by the
PWM signal, so the LEDs operate at either zero or full current. The average
LED current increase proportionally with the duty cycle of the PWM signal.
2. Using a DC Voltage to FB Pin
From the Figure 2, we can add a DC voltage to FB pin, we adjust the LED
current by Changing the DC voltage, which control the brightness, DC voltage
range is from 0V to 2V.
LED1
LC3300
FB
VDC R13
R12
90K 5K
LED2
LED3
R1
10
Figure 2. Dimming Control Using a DC Voltage
3. Using a Filtered PWM Signal to FB Pin
The filtered PWM signal can be considered as an adjustable DC voltage. It
can be used to replace the variable DC voltage source in dimming control.
The circuit is shown in Figure 3.
LED1
PWM R14
LC3300
FB
R13 R12
90K
C12
0.1uF
5K
LED2
LED3
R1
10
Figure 3. Dimming Control Using a Filtered PWM Signal
www.leadchip.com.cn
Copyright@2007, Leadchip semi
5
Your final power solution
Free Datasheet http://www.datasheet4u.com/
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LC3300.PDF ] | |
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