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UCC27321PE4 Datasheet(PDF) 10 Page - Texas Instruments

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Part # UCC27321PE4
Description  SINGLE 9-A HIGH SPEED LOW-SIDE MOSFET DRIVER WITH ENABLE
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC27321PE4 Datasheet(HTML) 10 Page - Texas Instruments

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UCC27321, UCC27322
UCC37321, UCC37322
SLUS504D − SEPTEMBER 2002 − REVISED SEPTEMBER 2007
10
www.ti.com
APPLICATION INFORMATION
drive current and power requirements (continued)
The switching load presented by a power MOSFET can be converted to an equivalent capacitance by examining
the gate charge required to switch the device. This gate charge includes the effects of the input capacitance
plus the added charge needed to swing the drain of the device between the ON and OFF states. Most
manufacturers provide specifications that provide the typical and maximum gate charge, in nC, to switch the
device under specified conditions. Using the gate charge Qg, one can determine the power that must be
dissipated when charging a capacitor. This is done by using the equivalence Qg = CeffV to provide the following
equation for power:
P
+ C
V2
f
+ Qg V f
This equation allows a power designer to calculate the bias power required to drive a specific MOSFET gate
at a specific bias voltage.
enable
UCC37321/2 provides an Enable input for improved control of the driver operation. This input also incorporates
logic compatible thresholds with hysteresis. It is internally pulled up to VDD with 100-kΩ resistor for active high
operation. When ENBL is high, the device is enabled and when ENBL is low, the device is disabled. The default
state of the ENBL pin is to enable the device and therefore can be left open for standard operation. The output
state when the device is disabled is low regardless of the input state. See the truth table below for the operation
using enable logic.
ENBL input is compatible with both logic signals and slow changing analog signals. It can be directly driven or
a power−up delay can be programmed with a capacitor between ENBL and AGND.
Table 1. Input/Ouput Table
INVERTING
UCC37321
0
0
0
0
1
0
0
1
1
1
1
0
NON−
INVERTING
UCC37322
0
0
0
0
1
0
0
0
1
1
1
1
ENBL
IN
OUT


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