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參數(shù)資料
| 型號： | FAN53180 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 6-Bit VID Controlled 2-4 Phase DC-DC Controller |
| 中文描述： | 6位VID控制2-4相DC - DC控制器 |
| 文件頁數(shù)： | 24/28頁 |
| 文件大?。?/td> | 851K |
| 代理商： | FAN53180 |
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FAN53180
PRODUCT SPECIFICATION
24
REV. 1.0.0 6/10/03
Figure 8. AC Loadline Waveform
16. If the V
ACDRP
and V
DCDRP
are different by more than
a couple of millivolts, use Equation 38 to adjust C
CS
.
You may need to parallel different values to get the right
one since there are limited standard capacitor values
available (it is a good idea to have locations for two
capacitors in the layout for this).
17. Repeat Steps 11 to 13 and repeat adjustments if neces-
sary. Once complete, do not change C
CS
for the rest of
the procedure.
18. Set dynamic load step to maximum step size (do not use
a step size larger than needed) and verify that the output
waveform is square (which means V
ACDRP and
V
DCDRP
are equal). NOTE: MAKE SURE LOAD STEP SLEW
RATE AND TURN-ON ARE SET FOR A SLEW RATE
OF ~150–250A/μs (for example, a load step of 50A
should take 200 ns–300 ns) WITH NO OVERSHOOT.
Some dynamic loads will have an excessive turn-on
overshoot if a minimum current is not set properly (this
is an issue if using a VTT tool).
Initial Transient Setting
19. With dynamic load still set at maximum step size,
expand scope time scale to see 2μs/div to 5μs/div. You
will see a waveform that may have two overshoots and
one minor undershoot (see Figure 9). Here, V
DROOP
is
the final desired value.
Figure 9. Transient Setting Waveform
20. If both overshoots are larger than desired, try making the
following adjustments in this order. (NOTE: If these
adjustments do not change the response, you are limited
by the output decoupling.) Check the output response
each time you make a change as well as the switching
nodes (to make sure it is still stable).
a. Make ramp resistor larger by 25% (R
RAMP
).
b. For V
TRAN1
, increase C
B
or increase switching
frequency.
c. For V
TRAN2
, increase R
A
and decrease C
A
by 25%.
21. For load release (see Figure 10), if V
TRANREL
is larger
than V
TRAN1
(see Figure 9), you do not have enough
output capacitance. You will either need more capaci-
tance or to make the inductor values smaller (if you
change inductors, you need to start the design over using
the spreadsheet and this tuning procedure).
Figure 10. Transient Setting Waveform
C
CS NEW
)
C
CS OLD
)
V
DCDRP
---------------------
×
=
(38)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN53180MTC | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:6-Bit VID Controlled 2-4 Phase DC-DC Controller |
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| FAN5331 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch |
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