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参数资料
| 型号： | LSP3132SSG |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 3/6页 |
| 文件大小： | 133K |
| 代理商： | LSP3132SSG |
Liteon Semiconductor Corporation
LSP3132
PWM Control 5A Step-Down Converter
Rev1.0
3/6
FUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL DESCROPTION
PWM Control
The LSP3132 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of
the LSP3132, 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 LSP3132 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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