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UC2856Q Fiches technique(PDF) 1 Page - Texas Instruments |
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UC2856Q Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 15 page 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CL SS VREF CS− CS+ EA+ EA− COMP CT SHUTDOWN VIN BOUT VC GND AOUT SYNC RT DW PACKAGE (TOP VIEW) P0008-01 UC2856Q www.ti.com SGLS265A – NOVEMBER 2004 – REVISED MAY 2011 IMPROVED CURRENT MODE PWM CONTROLLER Check for Samples: UC2856Q 1 FEATURES • Pin-for-Pin Compatible With the UC2846 • 65-ns Typical Delay From Shutdown to Outputs and 50-ns Typical Delay From Sync to Outputs • Improved Current Sense Amplifier With Reduced Noise Sensitivity • Differential Current Sense With 3-V Common Mode Range • Trimmed Oscillator Discharge Current for Accurate Deadband Control • Accurate 1-V Shutdown Threshold • High Current Dual Totem Pole Outputs (1.5-A peak) • TTL Compatible Oscillator SYNC Pin Thresholds • 4-kV ESD Protection DESCRIPTION The UC2856 is a high performance version of the popular UC2846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5-A peak output stages have been added to allow rapid switching of power FETs. A low impedance TTL compatible sync output has been implemented with a 3-state function when used as a sync input. Internal chip grounding has been improved to minimize internal noise caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier, results in enhanced noise immunity. Other features include a trimmed oscillator current (8%) for accurate frequency and dead time control; a 1 V, 5% shutdown threshold; and 4 kV minimum ESD protection on all pins. ORDERING INFORMATION(1) ORDERABLE TOP-SIDE TA PACKAGE PART NUMBER MARKING –40°C to 125°C SOP –DW Tape and reel UC2856QDWR UC2856Q (1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2011, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
Numéro de pièce similaire - UC2856Q_15 |
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Description similaire - UC2856Q_15 |
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