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TPS62700 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS62700 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 25 page PARAMETER MEASUREMENT INFORMATION V IN PVIN AVIN PGND AGND FB VCON EN SW 3.3 H m 4.7 F/10 F m m 10 F m V OUT L:LPS40183.3 H,DCR70m /VLF3014A 3.3 HDCR150m C :GRM188R60J106M10 FMurata0603size m W m W m IN C :GRM188R60J106M10 FMurata0603size OUT m GRM188Ru60J475K4.7 FMurata0603size m DETAILED DESCRIPTION OPERATION Dynamic Output Voltage Control VCON 100% Duty Cycle Low Dropout Operation TPS62700, TPS62701 www.ti.com................................................................................................................................................... SLVS784B – DECEMBER 2007 – REVISED JUNE 2008 The TPS6270x step down converter operates at a 2.0-MHz fixed frequency using pulse-width modulation (PWM) over the entire load range. This ensures low output-voltage ripple for RF-PA power applications. In PWM operation, the converter uses a unique fast-response voltage-mode control scheme to achieve good line and load regulation, allowing the use of small ceramic input and output capacitors. At the beginning of each clock cycle initiated by the clock signal, the High-Side MOSFET switch is turned on. The current flows from the input capacitor via the High-Side MOSFET switch through the inductor to the output capacitor and load. During this phase, the current ramps up until the PWM comparator trips and the control logic turns off the switch. The current limit comparator also turns off the switch when the current limit of the High-Side MOSFET switch is exceeded. After a short dead time to prevent shoot-through, the Low-Side MOSFET rectifier is turned on, and the inductor current ramps down. The current then flows from the inductor to the output capacitor and to the load. It turns back to the inductor through the Low-Side MOSFET rectifier. The next cycle is initiated by the clock signal turning off the Low-Side MOSFET rectifier and turning on the High-Side MOSFET switch. The output voltage of TPS6270x can be dynamically adjusted with an external analog voltage applied to the pin VCON. This voltage is typically supplied from an external DAC to adjust the supply voltage for the RF Power amplifier, and therefore to determine the RF output power. The output voltage is set to : VOUT = 2.5 x VCON. The output voltage can be set in the range between VFB, MIN (1.3 V) and VFB, MAX (3.09 V). The device provides an internal voltage gain factor of 2.5. For dynamic voltage adjustment the VCON voltage range is between VCON, MIN (0.52 V) and VCON, MAX (1.24 V). In Case the VCON voltage is out of this range, the output voltage is internally limited to VFB, MIN (1.3 V) and VFB, MAX (3.09 V). This allows using the TPS6270x as a fixed output voltage converter where the VCON Pin is connected, for example, to GND or VIN. The device starts to enter 100% duty-cycle mode when the input voltage approaches the nominal output voltage. In order to maintain the output voltage, the High-Side MOSFET switch is turned on 100% for one or more cycles. Copyright © 2007–2008, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): TPS62700 TPS62701 |
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