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LT4180MPGN-PBF Datasheet(PDF) 10 Page - Linear Technology

Part # LT4180MPGN-PBF
Description  Virtual Remote Sense Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT4180MPGN-PBF Datasheet(HTML) 10 Page - Linear Technology

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LT4180
10
4180fp
APPLICATIONS INFORMATION
With an oscillator tolerance of ±15%, the minimum
dither frequency is 414.8Hz, so the minimum decoupling
capacitance is:
C
Hz
µF
LOAD ==
22
57 2
2 414 8
46 36
.
.•
.
.
Ω
This is the minimum value. Select a nominal value to ac-
count for all factors which could reduce the nominal, such
as initial tolerance, voltage and temperature coefficients
and aging.
CHOLD Capacitor Selection and Compensation
With dither frequency determined, use the following equa-
tions to determine CHOLD values:
C
nF
fkHz
HOLD
DITHER
1
11 9
=
.
()
and
CC
nF
fkHz
HOLD
HOLD
DITHER
23
25
==
.
()
So, with a dither frequency of 488Hz:
C
nF
kHz
nF
HOLD1
11 9
0 488
24 4
==
.
.
.
and
CC
nF
kHz
nF
HOLD
HOLD
23
25
0 488
512
==
=
.
.(
)
.
NPO ceramic or other capacitors with low leakage and
dielectric absorption should be used for all hold capa-
citors.
Set CHOLD4 to 1μF.
Start with a 47pF capacitor between the COMP and DRAIN
pins of the LT4180. Add an RC network in parallel with the
47pF capacitor. 10k and 10nF are good starting values.
Connect a DC load corresponding to full-scale load cur-
rent and verify that VOUT produces a rounded squarewave
without any noticeable overshoot or ringing (similar to
the VOUT waveform in Figure 3). If overshoot or ringing
is observed, decrease the value of the resistor until it
just disappears. If overshoot or ringing is not observed,
increase the value of the resistor until it is observed, then
slightly decrease the value of the resistor so that overshoot
and ringing disappear. Check for proper voltage drop cor-
rection and converter behavior (start-up, regulation etc.),
over the load range, and repeat the above procedure with a
smaller value of the compensation capacitor, if necessary.
Decrease CHOLD4 capacitance until VOUT exhibits slight
low frequency instability, then increase CHOLD4 slightly
from this value.
Setting Output Voltage, Undervoltage and Overvoltage
Thresholds
The RUN pin has accurate rising and falling thresholds
whichmaybeusedtodeterminewhenVirtualRemoteSense
operation begins. Undervoltage threshold should never
be set lower than the minimum operating voltage of the
LT4180 (3.1V).
The overvoltage threshold should be set slightly greater
than the highest voltage which will be produced by the
power supply or regulator:
VOUT(MAX) = VLOAD(MAX) + VWIRE(MAX)
VOUT(MAX) should never exceed 1.5 • VLOAD
Since the RUN and OV pins connect to MOSFET input
comparators, input bias currents are negligible and a com-
mon voltage divider can be used to set both thresholds
(Figure 7).
Figure 7. Voltage Divider for Output Voltage, UVL and OVL
R3
FB
4180 F07
RUN
R2
LT4180
R4
OV
R1
VIN


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