TPS62410

SLVS737A – FEBRUARY 2007 – REVISED JULY 2015

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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

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

network may be connected.

8

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