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TC1426COA Datasheet(PDF) 6 Page - Microchip Technology |
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TC1426COA Datasheet(HTML) 6 Page - Microchip Technology |
6 / 14 page TC1426/TC1427/TC1428 DS21393B-page 6 2002 Microchip Technology Inc. 3.0 APPLICATIONS INFORMATION 3.1 SUPPLY BYPASSING Large currents are required to charge and discharge capacitive loads quickly. For example, charging a 1000pF load to 16V in 25nsec requires a 0.8A current from the device’s power supply. To guarantee low supply impedance over a wide frequency range, a parallel capacitor combination is recommended for supply bypassing. Low-inductance ceramic MLC capacitors with short lead lengths (<0.5-in.) should be used. A 1.0 µF film capacitor in parallel with one or two 0.1 µF ceramic MLC capacitors normally provides adequate bypassing. 3.2 GROUNDING The TC1426 and TC1428 contain inverting drivers. Individual ground returns for the input and output circuits or a ground plane should be used. This will reduce negative feedback that causes degradation in switching speed characteristics. FIGURE 3-1: INVERTING DRIVER SWITCHING TIME 3.3 INPUT STAGE The input voltage level changes the no-load or quiescent supply current. The N-channel MOSFET input stage transistor drives a 2.5mA current source load. With a logic "1" input, the maximum quiescent supply current is 9mA. Logic "0" input level signals reduce quiescent current to 500 µA maximum. Unused driver inputs must be connected to VDD or GND. Minimum power dissipation occurs for logic "0" inputs for the TC1426/TC1427/TC1428. The drivers are designed with 100mV of hysteresis. This provides clean transitions and minimizes output stage current spiking when changing states. Input voltage thresholds are approximately 1.5V, making a logic "1" input any voltage greater than 1.5V up to VDD. Input current is less than 1 µA over this range. The TC1426/TC1427/TC1428 may be directly driven by the TL494, SG1526/27, TC38C42, TC170 and similar switch-mode power supply integrated circuits. FIGURE 3-2: NONINVERTING DRIVER SWITCHING TIME +5V 10% 90% 10% 90% 10% 90% VDD 1 µF MKS-2 0V 0V TC1426 (1/2 TC1428) 1 2 Test Circuit 0.1 µF MLC Input VDD = 16V Output tR CL = 1000pF tD1 tF tD2 Input Output VDD 0.1 µF MLC Input VDD = 16V Output tR CL = 1000pF tD1 tF tD2 Input Output 90% 10% 10% 10% 90% 1 µF WIMA MKS-2 TC1427 (1/2 TC1428) +5V 0V 0V 90% Test Circuit 1 2 |
Similar Part No. - TC1426COA |
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Similar Description - TC1426COA |
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