参数资料
型号: LT1576CS8#TR
厂商: Linear Technology
文件页数: 22/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 8SOIC
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1.2V
输入电压: 5 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 200kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-SOIC
LT1576/LT1576-5
APPLICATIO N S I N FOR M ATIO N
How Do I Test Loop Stability?
The “standard” compensation for LT1576 is a 100pF
capacitor for C C , with R C = 0 ? . While this compensation
will work for most applications, the “optimum” value for
loop compensation components depends, to various ex-
tent, on parameters which are not well controlled. These
include inductor value ( ± 30% due to production toler-
ance, load current and ripple current variations), output
capacitance ( ± 20% to ± 50% due to production tolerance,
temperature, aging and changes at the load), output
capacitor ESR ( ± 200% due to production tolerance, tem-
perature 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
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.
“robust” and tolerant of all these variations.
RIPPLE FILTER
SWITCHING
REGULATOR
+
100 μ F TO
1000 μ F
470 ?
3300pF
4.7k
330pF
TO X1
OSCILLOSCOPE
PROBE
ADJUSTABLE
INPUT SUPPLY
ADJUSTABLE
DC LOAD
50 ?
TO
OSCILLOSCOPE
SYNC
100Hz TO 1kHz
100mV TO 1V P-P
1576 F13
Figure 13. Loop Stability Test Circuit
V OUT AT
I OUT = 500mA
BEFORE FILTER
V OUT AT
22
10mV/DIV
5A/DIV
0.2ms/DIV
Figure 14. Loop Stability Check
1576 F14
I OUT = 500mA
AFTER FILTER
V OUT AT
I OUT = 50mA
AFTER FILTER
LOAD PULSE
THROUGH 50 ?
f ≈ 780Hz
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