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參數(shù)資料
| 型號： | LT1432CS8-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 611K |
| 代理商： | LT1432CS8-3.3 |
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13
LT1432
U
S
A
O
PPLICATI
IU
U
100mV/DIV
100mV/DIV
50
μ
s/DIV
Figure 14. PC trace Current Limit Sense Resistor
with Kelvin Contacts
Time scale has been expanded to 50
μ
s/DIV. The spike
consists of several switching cycles of the LT1271 as
shown in the lower trace. In the upper trace, the output
filter has smoothed the switching frequency content of the
spike, but the actual spike amplitude is only modestly
reduced. Increasing the output filter constants from 10
μ
H
and 220
μ
F to 20
μ
H and 330
μ
F would eliminate most of
the spike.
Current Limiting
The LT1432 has true switching current limit with a sense
voltage of 60mV. This low sense voltage is used to
maintain high efficiency with normal loads and to make it
possible to use the printed circuit board trace material as
the sense resistor. The sense resistor value must take
ripple current into account because the LT1432 limits on
the peak of the inductor ripple current. Errors in the sense
resistor must also be allowed for.
R
V
1.2 *+I
(
I
2
SENSE
SENSE
MAX
RIP
=
R
SENSE
= Required sense resistor
V
SENSE
= 60mV
I
MAX
= Maximum load current, including any surge
longer than 50
μ
s
* 1.2 is a fudge factor for errors in R
SENSE
and V
SENSE
.
I
2
=1/2 Peak to Peak Inductor Ripple Current
(
=V
V – V
2V (f)(L)
RIP
OUT
OUT
)
f = Frequency
L = Inductance
Use V
IN
maximum
Example: I
MAX
= 2A, f = 60kHz, maximum V
IN
= 15V,
L = 50
μ
H;
I
2
=
5 15 – 5
2 15 60E
50E
0.55A
R
=
60mV
2A 1.2 +0.55A
0.02
RIP
3
–6
SENSE
)
=
=
The formula for R
SENSE
shows a 1.2 multiplier term in the
denominator which makes typical current limit 20% above
full load current. This accounts for small errors in the PCB
trace resistance. Trace resistance errors are kept to a
minimum by using internal traces (on multilayer boards)
KEEP THIS DISTANCE SHORT
FOR BEST LOAD REGULATION.
TO LOAD
}
TO V
OUT
TO V
PIN
“W”
“L” IS MEASURED FROM
POINT “X” TO POINT “Y”
FROM
INDUCTOR
LT 432 F14
“X”
“Y”
Figure 13
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