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CSD87384M датащи(PDF) 10 Page - Texas Instruments |
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CSD87384M датащи(HTML) 10 Page - Texas Instruments |
10 / 20 page VDD ENABLE PWM GND BOOT DRVH LL DRVL V DD PWM V IN V OUT Driver IC CSD87384M A V Averaging Circuit V A Output Current (IOUT) A Input Current (IIN) V Input Voltage (VIN) Averaged Switch Node Voltage (VSW_AVG) V IN V SW P GND TG BG Gate Drive Voltage (VDD) CSD87384M SLPS415B – SEPTEMBER 2013 – REVISED JANUARY 2014 www.ti.com The CSD87384M NexFET™ power block is an optimized design for synchronous buck applications using 5 V gate drive. The Control FET and Sync FET silicon are parametrically tuned to yield the lowest power loss and highest system efficiency. As a result, a new rating method is needed which is tailored toward a more systems- centric environment. System level performance curves such as Power Loss, Safe Operating Area, and normalized graphs allow engineers to predict the product performance in the actual application. Power Loss Curves MOSFET centric parameters such as RDS(ON) and Qgd are needed to estimate the loss generated by the devices. To simplify the design process for engineers, TI has provided measured power loss performance curves. Figure 1 plots the power loss of the CSD87381P as a function of load current. This curve is measured by configuring and running the CSD87381P as it would be in the final application (see Figure 27). The measured power loss is the CSD87381P loss and consists of both input conversion loss and gate drive loss. Equation 1 is used to generate the power loss curve. (VIN × IIN) + (VDD × IDD) – (VSW_AVG × IOUT) = Power Loss (1) The power loss curve in Figure 1 is measured at the maximum recommended junction temperatures of 125°C under isothermal test conditions. Safe Operating Curves (SOA) The SOA curves in the CSD87384M data sheet provide guidance on the temperature boundaries within an operating system by incorporating the thermal resistance and system power loss. Figure 3 to Figure 4 outline the temperature and airflow conditions required for a given load current. The area under the curve dictates the safe operating area. All the curves are based on measurements made on a PCB design with dimensions of 4 inches (W) x 3.5 inches (L) x 0.062 inch (T) and 6 copper layers of 1-oz. copper thickness. Normalized Curves The normalized curves in the CSD87384M data sheet provide guidance on the Power Loss and SOA adjustments based on their application-specific needs. These curves show how the power loss and SOA boundaries adjust for a given set of systems conditions. The primary y-axis is the normalized change in power loss and the secondary y-axis is the change in system temperature required in order to comply with the SOA curve. The change in power loss is a multiplier for the Power Loss curve and the change in temperature is subtracted from the SOA curve. Figure 27. Typical Application 10 Submit Documentation Feedback Copyright © 2013–2014, Texas Instruments Incorporated |
Аналогичный номер детали - CSD87384M |
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Аналогичное описание - CSD87384M |
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