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參數(shù)資料
| 型號(hào)： | AT1308 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Preliminary Product Information Micro-Power Step up DC-DC Converter |
| 中文描述： | 初步產(chǎn)品信息微功率升壓DC - DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 14/15頁(yè) |
| 文件大小： | 377K |
| 代理商： | AT1308 |
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AT1308
Preliminary Product Information
Micro-Power Step up DC-DC Converter
Diode selection
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879 Email:
service@aimtron.com.tw
14
Rev A ; 01/18/05
The output diode has average current of I
O
, and peak current the same as the inductor’s peak current
and a voltage rating at least 1.5 times the output voltage. Schottky diode is recommended and it should
be able to handle those current.
Output Capacitor
The AT1308 is specially compensated to be stable with capacitors, which have a worst- case minimum
value of 1uF at the particular V
OUT
being set. Output ripple voltage requirements also determine the
minimum value and type of capacitors. Output ripple voltage consists of two components the voltage
drop caused by the switching current through the ESR of the output capacitor and the charging and
discharging of the output capacitor:
I
V
×
OSC
OUT
O
O
in
O
LPEAK
RIPPLE
f
C
V
V
ESR
I
V
×
+
×
=
For low ESR ceramic capacitors, the output ripple is dominated by the charging or discharging of the
output capacitor.
Impacting frequency stability of the overall control loop, Ceramic capacitors are preferred on the
output capacitance, but tantalum capacitor may also suffice., If it use tantalum capacitor on the output
terminal, that in addition the capacitance parallel with feedback resistor network is necessary. These
frequency response effects together with the internal frequency compensation circuitry of AT308
modify the gain and phase shift of the closed loop system.
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.
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