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MCP1416 Datasheet(PDF) 11 Page - Microchip Technology |
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MCP1416 Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 20 page  © 2008 Microchip Technology Inc. DS22092C-page 11 MCP1415/16 4.0 APPLICATION INFORMATION 4.1 General Information MOSFET drivers are high-speed, high current devices which are intended to source/sink high peak currents to charge/discharge the gate capacitance of external MOSFETs or IGBTs. In high frequency switching power supplies, the PWM controller may not have the drive capability to directly drive the power MOSFET. A MOSFET driver like the MCP1415/16 family can be used to provide additional source/sink current capability. 4.2 MOSFET Driver Timing The ability of a MOSFET driver to transition from a fully off state to a fully on state are characterized by the drivers rise time (tR), fall time (tF), and propagation delays (tD1 and tD2). The MCP1415/16 family of drivers can typically charge and discharge a 1000 pF load capacitance in 20 ns along with a typical turn on (tD1) propagation delay of 41 ns. Figure 4-1 and Figure 4-2 show the test circuit and timing waveform used to verify the MCP1415/16 timing. FIGURE 4-1: Inverting Driver Timing Waveform. FIGURE 4-2: Non-Inverting Driver Timing Waveform. 4.3 Decoupling Capacitors Careful layout and decoupling capacitors are required when using power MOSFET drivers. Large current are required to charge and discharge capacitive loads quickly. For example, approximately 720 mA are needed to charge a 1000 pF load with 18V in 25 ns. To operate the MOSFET driver over a wide frequency range with low supply impedance, a ceramic and low ESR film capacitor is recommended to be placed in parallel between the driver VDD and GND. A 1.0 µF low ESR film capacitor and a 0.1 µF ceramic capacitor placed between pins 2 and 4 is required for reliable operation. These capacitors should be placed close to the driver to minimize circuit board parasitics and provide a local source for the required current. 0.1 µF +5V 10% 90% 10% 90% 10% 90% 18V 1µF 0V 0V MCP1415 CL = 1000 pF Input Input Output tD1 tF tD2 Output tR V DD = 18V Ceramic 90% Input tD1 tF tD2 Output tR 10% 10% 10% +5V 18V 0V 0V 90% 90% 0.1 µF 1µF MCP1416 CL = 1000 pF Input Output V DD = 18V Ceramic |
Número de pieza similar - MCP1416 |
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Descripción similar - MCP1416 |
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