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CSD87384M датащи(PDF) 10 Page - Texas Instruments

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номер детали CSD87384M
подробное описание детали  Synchronous Buck NexFET Power Block II
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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CSD87384M датащи(HTML) 10 Page - Texas Instruments

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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
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