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ACE714C bảng dữ liệu(PDF) 1 Page - ACE Technology Co., LTD.

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ACE714C
Max. 3MHz, Variable Frequency Step-up DC/DC Converter
VER 1.2
1
Description
The ACE714C 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 250mA output current at
4-LEDs application with 3V input voltage is as low as 120uA. All of these features make ACE714C be
suitable for the portable devices, which are supplied by a single battery.
Features
Up to 19V 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
19V Over Output Voltage Protection
Application
Compact Back Light Module
Power Source for LED
Constant Current Source
Typical Application
L1
D1
Vin
10uH
SS14
LED 1
LED 17
LED2
LED 18
+
Cin
+
Cout
4.7uF
4.7uF
LED 3
LED 19
ON
Vin
LX
OFF
ACE714C OVP
LED 4
LED 20
CE
FB
GND
R1
R5
Figure 1. ACE714C Typical Application Circuit


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