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TC1427CPA Arkusz danych(PDF) 3 Page - TelCom Semiconductor, Inc |
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TC1427CPA Arkusz danych(HTML) 3 Page - TelCom Semiconductor, Inc |
3 / 6 page 4-209 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 1.2A DUAL HIGH-SPEED MOSFET DRIVERS TC1426 TC1427 TC1428 ELECTRICAL CHARACTERISTICS: Over operating temperature range with 4.5V ≤ VDD + ≤ 16V unless otherwise specified. Symbol Parameter Test Conditions Min Typ Max Unit Input VIH Logic 1, Input Voltage 3 — — V VIL Logic 0, Input Voltage — — 0.8 V IIN Input Current 0V ≤ VIN ≤ VDD – 10 — 10 µA Output VOH High Output Voltage Test Figures 1 and 2 VDD – 0.025 — — V VOL Low Output Voltage Test Figures 1 and 2 — — 0.025 V RO Output Resistance VIN = 0.8V, — 15 23 Ω IOUT = 10mA, VDD = 16V VIN = 3V, — 10 18 IOUT = 10mA, VDD = 16V I Latch-Up Current Withstand Reverse Current > 500 — — mA Switching Time (Note 1) tR Rise Time Test Figures 1 and 2 — — 60 nsec tF Fall Time Test Figures 1 and 2 — — 40 nsec tD1 Delay Time Test Figures 1 and 2 — — 125 nsec tD2 Delay Time Test Figures 1 and 2 — — 125 nsec Power Supply IS Power Supply Current VIN = 3V (Both Inputs) — — 13 mA VIN = 0V (Both Inputs) — — 0.7 Note: 1. Switching times guaranteed by design. SUPPLY BYPASSING Large currents are required to charge and discharge capacitive loads quickly. For example, charging a 1000-pF load to 16V in 25nsec requires an 0.8A current from the device power supply. To guarantee low supply impedance over a wide fre- quency 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- µF film capacitor in parallel with one or two 0.1- µF ceramic MLC capacitors normally provides adequate bypassing. 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 char- acteristics. INPUT STAGE The input voltage level changes the no-load or quies- cent 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 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 TC1426/27/28. The drivers are designed with 100 mV of hysteresis. This provides clean transitions and minimizes output stage current spiking when changing states. Input voltage thresh- olds are approximately 1.5V, making logic "1" input any voltage greater than 1.5V up to VDD. Input current is less than 1 µA over this range. The TC1426/27/28 may be directly driven by the TL494, SG1526/27, TC38C42, TC170 and similar switch-mode power supply integrated circuits. |
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