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LTM4676A Datenblatt(PDF) 73 Page - Linear Technology

Teilenummer LTM4676A
Bauteilbeschribung  Dual 13A or Single 26A 關Module Regulator with Digital Power System Management
Download  136 Pages
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTM4676A Datenblatt(HTML) 73 Page - Linear Technology

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LTM4676A
73
4676afa
For more information www.linear.com/LTM4676A
applicaTions inForMaTion
EMI PERFORMANCE
The SWn pin provides access to the midpoint of the power
MOSFETs in LTM4676A’s power stages.
Connecting an optional series RC network from SWn to
GND can dampen high frequency (~30MHz+) switch node
ringing caused by parasitic inductances and capacitances
in the switched-current paths. The RC network is called
a snubber circuit because it dampens (or “snubs”) the
resonance of the parasitics, at the expense of higher
power loss.
To use a snubber, choose first how much power to allocate
to the task and how much PCB real estate is available to
implement the snubber. For example, if PCB space al-
lows a low inductance 1W resistor to be used—derated
conservatively to 600mW (PSNUB)—then the capacitor in
the snubber network (CSW) is computed by:
CSW =
PSNUB
VINn(MAX)2 • fSW
where VINn(MAX) is the maximum input voltage that the
input to the power stage (VINn) will see in the application,
and fSW is the DC/DC converter’s switching frequency
of operation. CSW should be NPO, C0G or X7R-type (or
better) material.
The snubber resistor (RSW) value is then given by:
RSW =
5nH
CSW
The snubber resistor should be low ESL and capable of
withstanding the pulsed currents present in snubber cir-
cuits. A value between 0.7Ω and 4.2Ω is normal.
For ease of snubber implementation, integrated 2.2nF
snubber capacitors connect to each of the LTM4676A’s
channel switch nodes via a low inductance path. The
electrically floating ends of these snubber capacitors are
made available on the SNUBn pins of the LTM4676A. Us-
ing the aforementioned guidance on snubber selection,
a properly sized snubber resistor can be conveniently
connected directly between SNUBn and GND.
EMI performance of the LTM4676A (on DC1811B-B)
with and without a snubber is compared and contrasted
in Figure 32 and Figure 33. The snubber resistors applied
to the SNUBn pins reduce EMI signal amplitude by several
dBµV/m.
Figure 32. Radiated Emissions Scan of the LTM4676A
Producing 1VOUT at 26A, from 12VIN. DC1811B-B Hardware
with Outputs Paralleled. No Snubbers Applied. fSW =
350kHz. Measured in a 10m Chamber. Peak Detect Method
Figure 33. Radiated Emissions Scan of the LTM4676A
Producing 1VOUT at 26A, from 12VIN. DC1811B-B Hardware
with Outputs Paralleled. 1Ω (1/4W rated) Snubber
Resistors Applied from SNUBn to GND. fSW = 350kHz.
Measured in a 10m Chamber. Peak Detect Method
FREQUENCY (MHz)
30
–10
0
10
30
40
50
70
4676A F33
20
60
422.4
1010
226.2
618.6
814.8
FREQUENCY (MHz)
30
–10
0
10
30
40
50
70
4676A F32
20
60
422.4
1010
226.2
618.6
814.8


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