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UC2877L Fiches technique(PDF) 7 Page - Texas Instruments |
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UC2877L Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 19 page 7 UC1875/6/7/8 UC2875/6/7/8 UC3875/6/7/8 VC (output switch supply voltage):This pin supplies power to the output drivers and their associated bias cir- cuitry. Connect VC to a stable source above 3V for nor- mal operation, above 12V for best performance. This supply should be bypassed directly to the PWRGND pin with low ESR, low ESL capacitors. VIN (primary chip supply voltage): This pin supplies power to the logic and analog circuitry on the integrated circuit that is not directly associated with driving the out- put stages. Connect VIN to a stable source above 12V for normal operation. To ensure proper chip functionality, these devices will be inactive until VIN exceeds the up- per undervoltage lockout threshold. This pin should by bypassed directly to the GND pin with low ESR, low ESL capacitors. NOTE: When VIN exceeds the UVLO threshold the sup- ply current (IIN) will jump from about 100µA to a current in excess of 20 µA. If the UC1875 is not connected to a well bypassed supply, it may immediately enter UVLO again. VREF: This pin is an accurate 5V voltage reference. This output is capable of delivering about 60mA to peripheral circuitry and is internally short circuit current limited. VREF is disabled while VIN is low enough to force the chip into UVLO. The circuit is also in UVLO until VREF reaches approximately 4.75V. For best results bypass VREF with a 0.1 µF, low ESR, low ESL, capacitor to the GND pin. PIN DESCRIPTIONS (cont.) When power is applied to the circuit and VIN is below the upper UVLO threshold, IIN will be below 600µA, the reference generator will be off, the fault latch is reset, the soft-start pin is discharged, and the outputs are ac- tively held low. When VIN exceeds the upper UVLO threshold, the reference generator turns on. All else re- mains in the shut-down mode until the output of the ref- erence, VREF, exceeds 4.75V. APPLICATION INFORMATION Undervoltage Lockout Section UDG-99136 GATE REFERENCE GENERATOR VIN 10.75V/9.25V VREF GND INTERNAL BIAS 4.75V TO SOFT- START LOGIC Simplified Oscillator Schematic UDG-95077 UDG-95079 UDG-95078 The high frequency oscillator may be either free-running or externally synchronized. For free-running operation, the frequency is set via an ex- ternal resistor and capacitor to ground from the FREQSET pin. |
Numéro de pièce similaire - UC2877L |
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Description similaire - UC2877L |
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