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ACE77LE9GM+H データシート(PDF) 6 Page - ACE Technology Co., LTD.

部品番号 ACE77LE9GM+H
部品情報  High Efficiency Low Noise PFM Step-Up DC/DC Converter
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メーカー  ACE [ACE Technology Co., LTD.]
ホームページ  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE77LE9GM+H データシート(HTML) 6 Page - ACE Technology Co., LTD.

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ACE77LE9
High Efficiency Low Noise PFM Step-Up DC/DC Converter
VER 1.1
6
Application Information LED Current Control
The ACE77LE9 regulates the LED current by setting the current sense resistor (R1) connecting to
feedback and ground. The ACE77LE9 feedback voltage (VFB) is 0.20V. The LED current (ILED) can be
set by a resistor R1. ILED=0.20/R1. In order to have an accurate LED current, a precision resistor is
preferred (1% is recommended).
PWM Dimming Control
When adding the PWM signal to CE pin, the ACE77LE9 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 magnitude of the PWM signal should be higher than the maximum enable
voltage of EN pin, in order to let the dimming control perform correctly. The recommended frequency
range of the PWM signal is from 100Hz to 100 kHz.
Inductor Selection
The recommended val
ue of inductor is 2.2μH to 10μH. Small size and better efficiency are the major
concerns for portable device, such as ACE77LE9 used for mobile phone. The inductor should have low
core loss at 2MHz and low DCR for better efficiency. To avoid inductor saturation current rating should be
considered.
Capacitor Selection
Input and output ceramic capacitors of 4.7μF are recommended for ACE77LE9 applications. For better
voltage filtering, ceramic capacitors with low ESR are recommended. X5R and X7R types are suitable
because of their wider voltage and temperature ranges.
Diode Selection
Schottky diode is a good choice for ACE77LE9 because of its low forward voltage drop and fast reverses
recovery. Using Schottky diode can get better efficiency. The high speed rectification is also a good
characteristic of Schottky diode for high switching frequency. Current rating of the diode must meet the
root mean square of the peak current and output average current multiplication as following:
ID(RMS)
≈(IOUT×IPEAK )1/2
The diode’s reverse breakdown voltage should be larger than the output voltage. SS0520 is
recommended Schottky diode for rectifier.
Layout Guide
A full GND plane without gap break.
Minimized LX node copper area to reduce EMI.
Minimized FB node copper area and keep far away from noise sources.


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