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TC1426CPA Fiches technique(PDF) 6 Page - Microchip Technology |
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TC1426CPA Fiches technique(HTML) 6 Page - Microchip Technology |
6 / 16 page TC1426/TC1427/TC1428 DS21393D-page 6 2001-2012 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 1000 pF load to 16V in 25 nsec requires a 0.8A current from the device's power supply. To ensure low supply impedance over a wide frequency range, a parallel capacitor combination is recom- mended for supply bypassing. Low-inductance ceramic MLC capacitors with short lead lengths (<0.5-in.) should be used. A 1.0 F film capacitor in parallel with one or two 0.1 F 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 2.5 mA current source load. With a logic ‘1’ input, the maximum quiescent supply current is 9 mA. Logic ‘0’ input level signals reduce quiescent current to 500 A 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 100 mV 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 A 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 WIMA MKS-2 0V 0V TC1426 (1/2 TC1428) 1 2 Test Circuit 0.1 μF MLC Input VDD = 16V Output tR CL = 1000 pF tD1 tF tD2 Input Output VDD 0.1 μF MLC Input VDD = 16V Output tR CL = 1000 pF 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 |
Numéro de pièce similaire - TC1426CPA |
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Description similaire - TC1426CPA |
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