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TPS51317 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS51317 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 28 page Time (ms) Current Feedback t ON t V CS V COMP UDG-10187 V REF TPS51317 SLUSAH9 – MARCH 2011 www.ti.com APPLICATION INFORMATION Functional Overview The TPS51317 is a D-CAP+ ™ mode adaptive on-time converter. Integrated high-side and low-side FET supports output current to a maximum of 6-ADC. The converter automatically runs in discontinuous conduction mode (DCM) to optimize light-load efficiency. Multiple switching frequencies are provided to enable optimization of the power chain for the cost, size and efficiency requirements of the design (see Table 4). In adaptive on-time converters, the controller varies the on-time as a function of input and output voltage to maintain a nearly constant frequency during steady-state conditions. In conventional constant on-time converters, each cycle begins when the output voltage crosses to a fixed reference level. However, in the TPS51317, the cycle begins when the current feedback reaches an error voltage level which is the amplified difference between the reference voltage and the feedback voltage. PWM Operation Referring to Figure 3, in steady state, continuous conduction mode, the converter operates in the following way. Starting with the condition that the top FET is off and the bottom FET is on, the current feedback (VCS) is higher than the error amplifier output (VCOMP). VCS falls until it hits VCOMP, which contains a component of the output ripple voltage. VCS is not directly accessible by measuring signals on pins of TPS51317. The PWM comparator senses where the two waveforms cross and triggers the on-time generator. Figure 3. D-CAP+ ™ Mode Basic Waveforms The current feedback is an amplified and filtered version of the voltage between PGND and SW during low-side FET on-time. The TPS51317 also provides a single-ended differential voltage (VOUT) feedback to increase the system accuracy and reduce the dependence of circuit performance on layout. 10 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): TPS51317 |
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