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MAX5057AASA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX5057AASA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 15 page Supply Bypassing and Grounding Pay extra attention to bypassing and grounding the MAX5054–MAX5057. Peak supply and output currents may exceed 8A when both drivers drive large external capacitive loads in phase. Supply voltage drops and ground shifts create forms of negative feedback for inverters and may degrade the delay and transition times. Ground shifts due to insufficient device grounding may also disturb other circuits sharing the same AC ground return path. Any series inductance in the VDD, OUT_, and/or GND paths can cause oscillations due to the very high di/dt when switching the MAX5054–MAX5057 with any capacitive load. Place one or more 0.1µF ceramic capacitors in parallel as close to the device as possible to bypass VDD to GND. Use a ground plane to minimize ground return resistance and series inductance. Place the external MOSFET as close as possible to the MAX5054–MAX5057 to further minimize board induc- tance and AC path impedance. Power Dissipation Power dissipation of the MAX5054–MAX5057 consists of three components: caused by the quiescent current, capacitive charge/discharge of internal nodes, and the output current (either capacitive or resistive load). Maintain the sum of these components below the maxi- mum power dissipation limit. The current required to charge and discharge the internal nodes is frequency dependent (see the Supply Current vs. Supply Voltage graph in the Typical Operating Characteristics). The power dissipation (PQ) due to the quiescent switching supply current (IDD-SW) per driver can be calculated as: PQ = VDD x IDD-SW For capacitive loads, use the following equation to esti- mate the power dissipation per driver: PCLOAD = CLOAD x (VDD) 2 x fSW where CLOAD is the capacitive load, VDD is the supply voltage, and fSW is the switching frequency. Calculate the total power dissipation (PT) per driver as follows: PT = PQ + PCLOAD Use the following equation to estimate the MAX5054– MAX5057 total power dissipation per driver when driving a ground-referenced resistive load: PT = PQ + PRLOAD PRLOAD = D x RON(MAX) x ILOAD 2 where D (duty cycle) is the fraction of the period the MAX5054–MAX5057’s output pulls high duty cycle, RON(MAX) is the maximum on-resistance of the device with the output high, and ILOAD is the output load current of the MAX5054–MAX5057. Layout Information The MAX5054–MAX5057 MOSFET drivers source and sink large currents to create very fast rising and falling edges at the gate of the switching MOSFET. The high di/dt can cause unacceptable ringing if the trace lengths and impedances are not well controlled. Use the following PC board layout guidelines when designing with the MAX5054–MAX5057: • Place one or more 0.1µF decoupling ceramic capacitors from VDD to GND as close to the device as possible. Connect VDD and GND to large copper areas. Place one bulk capacitor of 10µF (min) on the PC board with a low resistance path to the VDD input and GND of the MAX5054–MAX5057. • Two AC current loops form between the device and the gate of the driven MOSFET. The MOSFET looks like a large capacitance from gate to source when the gate pulls low. The active current loop is from the MOSFET gate to OUT_ of the MAX5054–MAX5057, to GND of the MAX5054–MAX5057, and to the source of the MOSFET. When the gate of the MOSFET pulls high, the active current is from the VDD terminal of the decoupling capacitor, to VDD of the MAX5054– MAX5057, to OUT_ of the MAX5054–MAX5057, to the MOSFET gate, to the MOSFET source, and to the negative terminal of the decoupling capacitor. Both charging current and discharging current loops are important. Minimize the physical distance and the impedance in these AC current paths. • Keep the device as close to the MOSFET as possible. • In a multilayer PC board, the inner layers should consist of a GND plane containing the discharging and charging current loops. • Pay extra attention to the ground loop and use a low-impedance source when using a TTL logic- input device. Fast fall time at OUT_ may corrupt the input during transition. 4A, 20ns, Dual MOSFET Drivers ______________________________________________________________________________________ 11 |
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