CS5166HGDWR16 View Datasheet(PDF) - Cherry semiconductor
Part Name
Description
MFG CO.
CS5166HGDWR16
Cherry semiconductor
'CS5166HGDWR16' PDF : 22 Pages View PDF
Application Information: continued
Maximum Current Limit Setpoint
ICL(MAX) = VTRIP(MAX) / RSENSE(MAX)
Therefore,
ICL(MAX) = 135mV / 3.18mΩ × 0.71 = 60A
Therefore, the range of load currents that will cause the
internal current sense comparator to detect an overload
condition through a 3mΩ embedded PCB trace is: 14.2A <
ICL 60A, with 28.6A being the nominal overload condition.
L= length (mils)
W = width (mils)
t = thickness (mils)
For most PCBs the copper thickness, t, is 35µm (1.37 mils)
for one ounce copper. ρ = 717.86µΩ-mil
For a Pentium®II load of 14.2A the resistance needed to
create a 43mV drop at full load is:
43mV 43mV
RDROOP = IOUT
=
= 3.0mΩ
14.2A
Design Rules for Using a Droop Resistor
The basic equation for laying an embedded resistor is:
L
L
RAR = ρ × A
or R = ρ ×
(W × t)
where:
A= W × t = cross-sectional area
ρ= the copper resistivity (µΩ - mil)
12V
The resistivity of the copper will drift with the temperature
according to the following guidelines:
∆R = 12% @ TA = +50˚C
∆R = 34% @TA = +100˚C
Droop Resistor Width Calculations
The droop resistor must have the ability to handle the load
current and therefore requires a minimum width which is
calculated as follows (assume one ounce copper thickness):
5V
1200µF/10V x 3
330pF
0.1µF
0.1µF
1µF
COFF
SS
COMP
VID0
VID1
VID2
VID3
VID4
VCC
GATE(H)
CS5166H
ISENSE
GATE(L)
PGnd
LGnd
PWRGD VFB
IRL3103S
1.2µH 3.0mΩ
510
1200µF
10V x 5
0.1µF
IRL3103S
3.3K
1000pF
5V
12V
1200µF/10V x 3
330pF
1µF
COFF
SS
0.1µF
COMP
VID0
VID1
VID2
VID3
VID4
VCC
GATE(H)
CS5166H
ISENSE
GATE(L)
PGnd
LGnd
VFB
IRL3103S
1.2µH 3.0mΩ
510
0.1µF
IRL3103S
3.3K
1000pF
2.8V/30A
Power
Supply
PWRGD
VID4
VID3
VID2
VID1
VID0
Figure 23: Current sharing of a 2.8V/30A power supply using two CS5166H synchronous buck regulators.
16
Share Link: 