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參數(shù)資料
| 型號： | XC9509A033AL |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| 中文描述： | 同步降壓型DC / DC轉(zhuǎn)換器，配有穩(wěn)壓器并聯(lián)穩(wěn)壓器加電壓檢測器 |
| 文件頁數(shù)： | 9/41頁 |
| 文件大小： | 3619K |
| 代理商： | XC9509A033AL |
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XC9509
Series
●
DC/DC Converter (Continued)
<PWM/PFM>
The PWM control of the XC9509A to F series are controlled on a specified frequency from light loads through the heavy
loads. Since the frequency is specified, the composition of a noise filter etc. becomes easy. However, the efficiency at
the time of the light load may become low. The XC9509H to L series can switch in any timing between PWM control
and PWM/PFM automatic switching control. The series cannot control only PFM mode. If needed, the operation can
be set on a specified frequency; therefore, the control of the noise etc. is possible and the high efficiency at the time of
the light load during PFM control mode is possible. With the automatic PWM/PFM switching control function, the series
ICs are automatically switched from PWM control to PFM control mode under light load conditions. If during light load
conditions the coil current becomes discontinuous and on-time rate falls lower than 30%, the PFM circuit operates to
output a pulse with 30% of a fixed on-time rate from the Lx pin. During PFM operation with this fixed on-time rate,
pulses are generated at different frequencies according to conditions of the moment. This causes a reduction in the
number of switching operations per unit of time, resulting in efficiency improvement under light load conditions.
However, since pulse output frequency is not constant, consideration should be given if a noise filter or the like is
needed. Necessary conditions for switching to PFM operation depend on input voltage, load current, coil value and
other factors.
<Synchronous / Non-synchronous>
The XC9509 series automatically switches between synchronous / non-synchronous according to the state of the DC/DC
converter. Highly efficient operations are achievable using the synchronous mode while the coil current is in a
continuous state. The series enters non-synchronous operation when the built-in N-ch switching transistor for
synchronous operation is shutdown, which happens when the load current becomes low and the operation changes to a
discontinuous state. The IC can operate without an external schottky diode because the parasitic diode in the N-ch
switching transistor provides the circuit's step-down operation. However, since Vf of the parasitic diode is a high 0.6V,
the efficiency level during non-synchronous operation shows a slight decrease. Please use an external schottky diode
if high efficiency is required during light load current.
●
Continuous Mode: Synchronous
●
Discontinuous Mode: Non-Synchronous
■
OPERATIONAL EXPLANATION (Continued)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XC9509A033AR | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509A033DL | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509A033DR | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509A036AL | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509A036AR | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XC9509A033AR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509A033DL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509A033DR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509A036AL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
| XC9509A036AR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector |
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