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UCC27321PE4 Datasheet(PDF) 10 Page - Texas Instruments |
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UCC27321PE4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 28 page 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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