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MSS7341 データシート(PDF) 14 Page - Microchip Technology |
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MSS7341 データシート(HTML) 14 Page - Microchip Technology |
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14 / 38 page  MCP16301 DS25004A-page 14 © 2011 Microchip Technology Inc. FIGURE 4-3: Shunt and External Boost Supply. Shunt Boost Supply Regulation is used for low output voltage converters operating from a wide ranging input source. A regulated 3.0V to 5.5V supply is needed to provide high side-drive bias. The shunt uses a Zener diode to clamp the voltage within the 3.0V to 5.5V range using the resistance shown in Figure 4-3. To calculate the shunt resistance, the boost drive current can be estimated using Equation 4-1. IBOOST_TYP for 3.3V Boost Supply = 0.6 mA IBOOST_TYP for 5.0V Boost Supply = 0.8 mA. EQUATION 4-1: BOOST CURRENT CB VOUT VIN CIN COUT SW BOOST GND EN FB L RTOP VIN Boost Diode FW Diode 2V 12V VZ = 5.1V C1 RSH CB VOUT VIN CIN COUT SW BOOST GND EN FB L RTOP RBOT VIN Boost Diode FW Diode 2V 12V 3.0V to 5.5V External Supply RBOT MCP16301 MCP16301 I BOOST I BOOST_TYP 1.5 × mA = |
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