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TPS51312 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS51312 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 21 page RB S Q Q R + CSN CSP K1 CB CA RA R12 R11 tON One- Shot + + + – Σ + – PWM Comparator + Integrator + – gM RFB2 RFB1 RLOAD COUT LOUT VIN VC VCS VFB UDG-12133 B C A VREF TPS51312 SLUSB57 – SEPTEMBER 2012 www.ti.com APPLICATION INFORMATION Functional Overview TPS51312 is a D-CAP2 mode adaptive on time converter with internal integrator. Monolithically integrate high side and low side FET supports output current to a maximum of 3-ADC. The converter automatically runs in discontinuous conduction mode to optimize light load efficiency. A switching frequency of 900 kHz enables optimization of the power train for the cost, size and efficiency performance of the design. PWM Operation The PWM operation is comprised of three separate loops, A, B and C as shown in Figure 9. Figure 9. ¾PWM Operation Internal Current Loop (A) Loop A is the internal current loop. The current information is sampled, divided and averaged at the SW node. The RC time constant and the gain of the current sense amplifier is chosen to cover the wide range of power stage design intended for this application. Internal Voltage Loop (B) Loop B is the internal voltage loop. The feedback voltage information is compared to the voltage reference at the input of the gM amplifier, the internal integrator is designed to provide a zero at the double pole location to boost phase margin at the desired crossover frequency. 8 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links :TPS51312 |
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