MP2930 datasheet(16/24 Pages) MPS

16 / 24 page

MP2930 - 4-PHASE PWM CONTROLLER WITH 8-BIT DAC CODE

MP2930 Rev. 1.01

www.MonolithicPower.com

10/30/2013

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

voltage, and is pulled to GND when the TM

voltage increases to above 39% of VCC voltage.

The VR_FAN signal is set to high when the TM

voltage goes below 28% of VCC voltage, and is

pulled to GND when the TM voltage goes back

to above 33% of VCC voltage. Figure 11 shows

the operation of those signals.

Current Sense Output

The current from the IDROOP pin is the sensed

average current. In typical application, the

IDROOP pin is connected to the FB pin for the

application where load line is required.

When load line function is not needed, the

IDROOP pin can be used to obtain the load

current information: with one resistor from the

IDROOP pin to GND, the voltage at the

IDROOP pin will be proportional to the load

current in Equation (15):

LOAD

ISEN

IDROOP



(15)

Where VIDROOP is the voltage at the IDROOP pin,

RIDROOP is the resistor between the IDROOP pin

and GND, ILOAD is the total output current of the

converter, RISEN is the sense resistor connected

to the ISEN+ pin, N is the active channel

number, and RX is the resistance of the current

sense element, either the DCR of the inductor

or RSENSE depending on the sensing method.

RIDROOP should be chosen to ensure that the

voltage at the IDROOP pin is less than 2V

under the maximum load current.

If the IDROOP pin is not used, tie it to GND.

MP2930 Datasheet(PDF) 16 Page - Monolithic Power Systems