AT1313 Datasheet, PDF (10/12 Pages) Aimtron Technology – High Efficiency, Constant Current White-LED Driver

AT1313
High Efficiency, Constant Current
White-LED Driver
V_RIPPLE
=
I _LPEAK
× ESR + ^{VO − Vin}
V_O
×
I_O
C_OUT ×
f _OSC
For low ESR ceramic capacitors, the output ripple is dominated by the charging or discharging of the
output capacitor.
PCB layout guidelines
Careful printed circuit layout is extremely important to avoid causing parasitical capacitance and line
inductance. The following layout guidelines are recommended to achieve optimum performance.
‧
Please the boost converter diode and inductor close to the LX pin and no via. Keep traces short,
direct, and wide.
‧
Please ceramic bypass capacitors near the input/output pin.
‧
Locate all feedback sense resistor as close to the feedback pins as possible.
‧
The ground connections of V_IN and V_OUT should be as close together as possible.
7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] Fax: [phone]
WWW: http://www.aimtron.com.tw
10/31/2006 REV:2.0
Email:[e-mail]
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