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參數(shù)資料
| 型號： | LSP3133SG |
| 廠商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 310K |
| 代理商： | LSP3133SG |
Liteon Semiconductor Corporation
LSP3133
PWM Control 2A Step-Down Converter
Rev1.0
3/7
FUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL DESCROPTION
PWM Control
The LSP3133 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of
the LSP3133, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage
produced by the switching can easily be removed through a filter because the switching frequency remains constant.
Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current.
Under Voltage Lockout
The under voltage lockout circuit of the LSP3133 assures that the high-side MOSFET driver outputs remain in the off
state whenever the supply voltage drops below 3.3V. Normal operation resumes once VCC rises above 3.5V.
RDS(ON) Current Limiting
The current limit threshold is setting by the external resistor connecting from VCC supply to OCSET. The internal
100uA sink current crossing the resistor sets the voltage at the pin of OCSET. When the PWM voltage is less than
the voltage at OCSET, an over-current condition is triggered.
I PEAK ×R DS(ON) = I OCSET × R OCSET
See above formula for setting the current limit value
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