參數(shù)資料
型號(hào)： 3745SN
廠商： Linear Technology Corporation
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 24/32頁(yè)
文件大?。?/td> 309K
代理商： 3745SN
24
LT1374
1374fb
APPLICATIO
S I
FOR
ATIO
U
current and ripple current variations), output capacitance
(
±
20% to
±
50% due to production tolerance, tempera-
ture, aging and changes at the load), output capacitor ESR
(
±
200% due to production tolerance, temperature and
aging), and finally, DC input voltage and output load
current. This makes it important for the designer to check
out the final design to ensure that it is “robust” and tolerant
of all these variations.
I check switching regulator loop stability by pulse loading
the regulator output while observing transient response at
the output, using the circuit shown in Figure 13. The
regulator loop is “hit” with a small transient AC load
current at a relatively low frequency, 50Hz to 1kHz. This
causes the output to jump a few millivolts, then settle back
to the original value, as shown in Figure 14. A well behaved
loop will settle back cleanly, whereas a loop with poor
phase or gain margin will “ring” as it settles. The number
of rings indicates the degree of stability, and the frequency
of the ringing shows the approximate unity-gain fre-
quency of the loop. Amplitude of the signal is not particu-
larly important, as long as the amplitude is not so high that
the loop behaves nonlinearly.
The output of the regulator contains both the desired low
frequency transient information and a reasonable amount
of high frequency (500kHz) ripple. The ripple makes it
difficult to observe the small transient, so a two-pole,
100kHz filter has been added. This filter is not particularly
critical; even if it attenuated the transient signal slightly,
this wouldn’t matter because amplitude is not critical.
W
U
U
After verifying that the setup is working correctly, I start
varying load current and input voltage to see if I can find
any combination that makes the transient response look
suspiciously “ringy.” This procedure may lead to an ad-
justment for best loop stability or faster loop transient
response. Nearly always you will find that loop response
looks better if you add in several k
for R
C
. Do this only
if necessary, because as explained before, R
C
above 1k
may require the addition of C
F
to control V
C
pin ripple.
If everything looks OK, I use a heat gun and cold spray on
the circuit (especially the output capacitor) to bring out
any temperature-dependent characteristics.
Keep in mind that this procedure does not take initial
component tolerance into account. You should see fairly
clean response under all load and line conditions to ensure
that component variations will not cause problems. One
note here: according to Murphy, the component most
Figure 13. Loop Stability Test Circuit
TO
OSCILLOSCOPE
SYNC
100Hz TO 1kHz
100mV TO 1V
P-P
ADJUSTABLE
DC LOAD
ADJUSTABLE
INPUT SUPPLY
100
μ
F TO
1000
μ
F
RIPPLE FILTER
1374 F13
TO X1
OSCILLOSCOPE
PROBE
3300pF
330pF
50
470
4.7k
SWITCHING
REGULATOR
+
0.2ms/DIV
1374 F14
10mV/DIV
V
OUT
AT
I
= 500mA
BEFORE FILTER
V
OUT
AT
I
= 500mA
AFTER FILTER
V
OUT
AT
I
= 50mA
AFTER FILTER
LOAD PULSE
THROUGH 50
f
≈
780Hz
5A/DIV
Figure 14. Loop Stability Check
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