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PDF ACE714 Data sheet ( Hoja de datos )
| Número de pieza | ACE714 | |
| Descripción | High Efficiency Low Noise PFM Step-up DC/DC Converter | |
| Fabricantes | ACE Technology | |
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ACE714
High Efficiency Low Noise PFM Step-up DC/DC Converter
Description
The ACE714 veriable frequency step-up Converter drives white LEDs with a constant current to provide
backlight in cell phones, PDAs, and other handheld 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.
The converter can operate from 2V to 6V, and capable of delivering maximum 200mA output current at
4-LEDs application with 3V input voltage is as low as 120uA. All of these features make ACE714 be
suitable for the portable devices, which are supplied by a single battery.
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
Application
Compact Back Light Module
Power Source for LED
Constant Current Source
Typical Application
L1
Vin 10uH
D1
SS14
LED 1
LED 17
+ Cin
4.7uF
LED2
+ Cout
4.7uF
LED 3
ON
OFF
Vin LX
ACE714 OVP
CE FB
GND
LED 4
R1
Figure 1. ACE714 Typical Application Circuit
LED 18
LED 19
LED 20
R5
VER 1.3 1
1 page  
ACE714
High Efficiency Low Noise PFM Step-up DC/DC Converter
Typical Performance Characteristics
Application Information
Dimming Control
1.Using a PWM Signal to CE Pin
When adding the PWM signal to CE pin, the ACE714 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. The frequency range of the PWM signal is from 1 kHz to 300KHz.
2.Using a DC Voltage
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.
VER 1.3 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ACE714.PDF ] | |
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