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TPS62184 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS62184 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 32 page ( ) IN PEAK OUT IN OUT OUT PSM V I L V V V I f × × - × = 2 2 ÷÷ ø ö çç è æ - = - = IN OUT OFF OFF SW V V t t D f 1 1 1 OUT IN OUT OFF ON V V V t t - × = TPS62184 www.ti.com SLVSCQ5A – DECEMBER 2014 – REVISED FEBRUARY 2015 Device Functional Modes (continued) While the OFF-time is predicted, the ON-time is set depending on the converter's duty cycle and calculated as: spacing (2) spacing Thereby the switching frequency is fixed for a given input and output voltage and is calculated as: spacing (3) spacing Both the master and follower phases regulate to the same level of VOUT with separate current loops, using the same peak current setpoint, cycle by cycle. This provides excellent peak current balancing, independent of inductor dc resistance matching. Since the follower phase operates with a fixed delay to the master phase, also cycle by cycle, phase shifted operation is obtained. The device features an automatic transition into Power Save Mode, entered at light loads, running in discontinuous conduction mode (DCM). 8.4.2 Power Save Mode (PSM) Operation As the load current decreases, the converter enters Power Save Mode operation. During PSM, the converter operates with a reduced switching frequency maintaining highest efficiency due to minimum quiescent current. Power Save Mode is based on a fixed peak current architecture, where the peak current (IPEAK) is set depending on VIN, VOUT, and L. After each single pulse, a pause time until the internal VOUT_Low level threshold is reached completes the switching cycle in PSM. The switching frequency for PSM in one phase operation is calculated as : spacing (4) spacing Equation 4 shows the linear relationship of output current and switching frequency. Typical values of the fixed peak current are shown in Figure 7. space Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS62184 |
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