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MCP16331 データシート(PDF) 16 Page - Microchip Technology |
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MCP16331 データシート(HTML) 16 Page - Microchip Technology |
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16 / 40 page  MCP16331 DS20005308B-page 16 2014 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 MCP16331 MCP16331 I BOOST I BOOST_TYP 1.5 mA = |
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