參數(shù)資料
型號： FAN5019MTCX
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 6-Bit VID Controller 2-4 Phase VRM10.X Controller
中文描述： SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28
封裝： TSSOP-28
文件頁數(shù)： 25/30頁
文件大小： 781K
代理商： FAN5019MTCX
PRODUCT SPECIFICATION
FAN5019
REV. 1.0.7 1/5/04
25
Choosing the closest standard values for these components
yields: C
A
= 390pF, R
A
= 16.9k
, C
B
= 1.5nF, and C
FB
=
33pF.
C
IN
Selection and Input Current di/dt Reduction
In continuous inductor-current mode, the source current of
the high-side MOSFET is approximately a square wave with
a duty ratio equal to n (V
OUT
/V
IN
) and an amplitude of one-
nth of the maximum output current. To prevent large voltage
transients, a low ESR input capacitor sized for the maximum
rms current must be used. The maximum rms capacitor cur-
rent is given by:
Figure 6. Typical Transient Response for Design Example
Note that the capacitor manufacturer’s ripple current ratings
are often based on only 2000 hours of life. This makes it
advisable to further derate the capacitor, or to choose a
capacitor rated at a higher temperature than required. Several
capacitors may be placed in parallel to meet size or height
requirements in the design. In this example, the input
capacitor bank is formed by three 2200μF, 16V Nichicon
capacitors with a ripple current rating of 3.5A each.
To reduce the input-current di/dt to below the recommended
maximum of 0.1A/μs, an additional small inductor (L > 1μH
@ 15A) should be inserted between the converter and the
supply bus. That inductor also acts as a filter between the
converter and the primary power source.
Tuning Procedure for the FAN5019
DC Load line Setting
1.
Build circuit based on compensation values computed
from design spreadsheet.
2.
Hook up DC load to circuit, turn on and verify opera-
tion. Also check for jitter at no-load and full-load.
3.
Measure output voltage at no-load (V
NL
). Verify it is
within tolerance.
Figure 7. Efficiency vs. Output Current
(Circuit of Figure 5)
4.
Measure output voltage at full-load cold (V
FLCOLD
).
Let board soak for ~10 minutes at full-load and measure
output (V
FLHOT
). If there is a change of more than a
couple of millivolts, adjust R
CS1
and R
CS2
using
Equations 35 and 37.
5.
Repeat Step 4 until cold and hot voltage measurements
remain the same.
6.
Measure output voltage from no-load to full-load using
5 Amp steps. Compute the loadline slope for each
change and then average to get overall loadline slope
(R
OMEAS
).
7.
If R
OMEAS
is off from R
O
by more than 0.05 m
,
use the following to adjust the R
PH
values:
8.
Repeat Steps 6 and 7 to check loadline and repeat
adjustments if necessary.
9.
Once complete with DC loadline adjustment, do not
change R
PH
, R
CS1
, R
CS2
, or R
TH
for rest of procedure.
1
1
×
×
×
=
D
n
I
D
I
O
CRMS
(34)
A
A
I
CRMS
5
10
1
125
.
×
3
1
65
125
.
=
×
×
=
(
(
)
)
FLHOT
NL
FLCOLD
V
NL
OLD
CS
NEW
CS
V
V
V
R
R
×
=
)
(
)
(
(35)
80
100
60
40
20
0
20
0
40
OUTPUT CURRENT (A)
E
60
10
30
50
O
OMEAS
R
OLD
PH
NEW
PH
R
R
R
×
=
)
(
)
(
(36)
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