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TPS62410 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS62410 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 36 page TPS62410 SLVS737A – FEBRUARY 2007 – REVISED JULY 2015 www.ti.com 7 Detailed Description 7.1 Overview 7.1.1 Operation The TPS62410 includes two synchronous step-down converters. The converters operate with typically 2.25-MHz fixed frequency pulse width modulation (PWM) at moderate to heavy load currents. If power-save mode is enabled, the converters automatically enter power-save mode at light load currents and operate in pulse frequency modulation (PFM). During PWM operation the converters use a unique fast response voltage mode controller scheme with input voltage feed-forward 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 P-channel MOSFET switch is turned on and the inductor current ramps up until the comparator trips and the control logic turns off the switch. Each converter integrates two current limits, one in the P-channel MOSFET and another one in the N-channel MOSFET. When the current in the P-channel MOSFET reaches its current limit, the P-channel MOSFET is turned off and the N-channel MOSFET is turned on. If the current in the N-channel MOSFET is above the N- MOS current limit threshold, the N-channel MOSFET remains on until the current drops below its current limit. The two DC/DC converters operate synchronized to each other. A 180° phase shift between converter 1 and converter 2 decreases the input RMS current. 7.1.1.1 Converter 1 In the adjustable output voltage version TPS62410 the converter 1 output voltage can be set through an external resistor network on pin DEF_1, which operates as an analog input. In this case, the output voltage can be set in the range of 0.6 V to VIN. The FB1 pin must be directly connected to the converter 1 output voltage VOUT1. It feeds back the output voltage directly to the regulation loop. The output voltage of converter 1 can also be changed by the EasyScale™ serial interface. This makes the device very flexible for output voltage adjustment. In this case, the device uses an internal resistor network. 7.1.1.2 Converter 2 In the adjustable output voltage version TPS62410, the converter 2 output voltage is set by an external resistor divider connected to ADJ2 pin and uses an external feed forward capacitor of 33 pF. It is also possible to change the output voltage of converter 2 through the EasyScale™ interface. In this case, the ADJ2 pin must be directly connected to converter 2 output voltage VOUT2. At TPS62410 no external resistor network may be connected. 8 Submit Documentation Feedback Copyright © 2007–2015, Texas Instruments Incorporated Product Folder Links: TPS62410 |
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