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參數(shù)資料
| 型號： | Xc9302 |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | PWM, PWM/PFM Switching Step-Up & Down DC/DC Converter Controller ICs |
| 中文描述： | 的PWM，PWM / PFM切換開關升壓 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 524K |
| 代理商： | XC9302 |
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The XC9301/9302 series are PWM (PWM/PFM switching) step-up/down DC/DC converter controller ICs. The XC9302 series switches to PFM
operations during light loads and is very efficient over a wide range in relation to load. Further, the efficiency can be maintained over a wide
input voltage range as both step-up & step-down operations are PWM controlled. Output voltage settings are laser trimmed.
[ON TIME]
P-Ch MOSFET (PSW) = ON, N-Ch MOSFET (NSW) = ON : Current flows from V
IN
via PSW, L, NSW, to GND : L is charged.
[OFF TIME]
P-Ch MOSFET (PSW) = OFF, N-Ch MOSFET (NSW) = OFF : Current flows from GND via SD1, L, SD2, to V
OUT
: V
OUT
rises due to the charge
stored at L.
By comparing V
OUT
with the internal reference voltage, the ON TIME vs OFF TIME ratio can be regulated & output stability can be protected.
Block Diagram Explanation
<Error Amp.>
The error amplifier is used as an output voltage monitor. It compares the reference voltage with the feedback from the voltage divided by the
internal resistor. Should a voltage higher than the reference voltage be fedback, the output of the error amp will increase.
<PWM Comparator>
The PWM comparator compares the output of the error amp with the ramp wave. When the voltage at the output of the error amp is low, the
EXT/ pin will be LOW level (Switching ON time).
<Ramp Wave Generator>
The ramp wave generator, as the name suggests, generates the switching frequency's ramp wave.
<PWM / PFM Controller>
With the XC9302 series, control is automatically switched between PWM and PFM according to the size of the load.
<Vref with Soft Start, CE>
The start up of the Vref voltage at the error amp's input is gradual due to the internal capacitor and low current circuit. Because of this
soft-start
function, the operations of the error amp's 2 inputs are balanced and the EXT/ pin's ON time can be manipulated to produce longer ON times.
Further, with the UVLO function, the signal will be such so as not to turn the MOS switch ON until any instability in the internal circuit stabilizes
during soft-start time. Even in cases where input voltage is so low as to produce instability in the IC, the UVLO function will operate and the
MOS switch will be turned OFF.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XC9302242ML | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| XC9302242MR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| XC9302252ML | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| XC9302252MR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| XC9302262ML | 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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