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參數(shù)資料
| 型號： | XC9101C25AKL |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 15/21頁 |
| 文件大?。?/td> | 156K |
| 代理商： | XC9101C25AKL |
Notes on Use
1.
The XC9101/9102 series are designed for use with a ceramic capacitor as output capacitor. If, however, the
potential difference between input and output is too large, a ceramic capacitor may fail to absorb the resulting
high switching energy. Then the output may present unusual oscillations. If the input-output potential
difference is large, connect an electrolytic capacitor in parallel to compensate for insufficient capacitance.
2.
3.
N. B.
Ensure that the absolute maximum ratings of external components and the XC9101/9102 series are not exceeded.
The characteristics of a DC/DC converter depend largely on external components as well as on the characteristics
of the XC9101/9102 series. Refer to the specifications of each component and take sufficient care when selecting
components.
Place external components in the proximity of the IC. Use thick and short connecting wires to reduce wiring
impedance. In particular, minimize the distance between the bypass capacitor and the IC.
15
Wire the IC to ground sufficiently. Variations in ground potential caused by ground current at the time of switching
may result in unstable operation of the IC. Specifically, provide sufficient ground wiring in the proximity of the Vss
pin.
The EXT pin of an IC of the XC9101/9102 series is designed to minimize the through current that occurs in the
internal circuitry. However, the gate drive of external PMOS has a low impedance for the sake of speed.
Therefore, if the input voltage is high and the bypass capacitor is attached away from the IC, the
charge/discharge current to the external PMOS may cause unstable operation due to switching operation of the
EXT pin.
As a solution to this problem, place the bypass capacitor as close to the IC as possible, so that voltage
variations at the V
IN
and VSS pins caused by switching are minimized. If this is not effective, insert a resistor of
several to several tens of ohms between the EXT pin and PMOS gate. Remember that the insertion of a
resistor slows down the switching speed and may result in reduced efficiency.
A PNP transistor can be used in place of PMOS. In this case, insert a resistor (Rb) and capacitor (Cb) between
the EXT pin and the base of the PNP transistor in order to limit the base current without slowing the switching
speed. Adjust Rb in a range of 500
to 1 k
according to the load and hFE of the transistor. Use a ceramic
capacitor as Cb, complying with Cb < 1/(2 x
π
x Rb x Fosc x 0.7), as a rule.
XC9101/02 Series
PWM Controlled, PWM//PFM Switchable Step-Up DC/DC Converters
EXT pin
Rb
[Inside IC, XC9101/02]
Cb
V
IN
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相關(guān)代理商/技術(shù)參數(shù) |
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| XC9101C25AKR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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