LTM4620 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTM4620

Dual 13A or Single 26A DC/DC µModule Regulator

Linear Technology 

LTM4620

APPLICATIONS INFORMATION

Input RMS Ripple Current Cancellation

Application Note 77 provides a detailed explanation of

multiphase operation. The input RMS ripple current cancel-

lation mathematical derivations are presented, and a graph

is displayed representing the RMS ripple current reduction

as a function of the number of interleaved phases. Figure 4

shows this graph.

Frequency Selection and Phase-Locked Loop

(MODE_PLLIN and fSET Pins)

The LTM4620 device is operated over a range of frequencies

to improve power conversion efficiency. It is recommended

to operate the lower output voltages or lower duty cycle

conversions at lower frequencies to improve efficiency by

lowering power MOSFET switching losses. Higher output

voltages or higher duty cycle conversions can be operated

at higher frequencies to limit inductor ripple current. The

efficiency graphs will show an operating frequency chosen

for that condition.

0.60

1-PHASE

0.55

2-PHASE

3-PHASE

4-PHASE

0.50

6-PHASE

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9

DUTY CYCLE (VOUT/VIN)

4620 F04

Figure 4. Input RMS Current Ratios to DC Load Current as a Function of Duty Cycle

16

For more information www.linear.com/LTM4620

4620fb

Share Link: