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MSS7341 データシート(PDF) 15 Page - Microchip Technology |
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MSS7341 データシート(HTML) 15 Page - Microchip Technology |
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15 / 38 page  © 2011 Microchip Technology Inc. DS25004A-page 15 MCP16301 To calculate the shunt resistance, the maximum IBOOST and IZ current are used at the minimum input voltage (Equation 4-2). EQUATION 4-2: SHUNT RESISTANCE VZ and IZ can be found on the Zener diode manufacturer’s data sheet. Typical IZ = 1 mA. FIGURE 4-4: Series Regulator Boost Supply. Series regulator applications use a Zener diode to drop the excess voltage. The series regulator bias source can be input or output voltage derived, as shown in Figure 4-4. The boost supply must remain between 3.0V and 5.5V at all times for proper circuit operation. R SH V INMIN V Z – I Boost I Z + ------------------------------ = CB VOUT VIN CIN COUT SW BOOST GND EN FB L RTOP RBOT VIN Boost Diode FW Diode 12V 15V to 30V CB VIN CIN SW BOOST GND EN FB L VIN Boost Diode FW Diode 2V 12V VZ = 7.5V VZ = 7.5V VOUT RTOP RBOT COUT MCP16301 MCP16301 |
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