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參數(shù)資料
| 型號： | LT1576IS8#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大小： | 290K |
| 代理商： | LT1576IS8#TR |
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22
LT1576/LT1576-5
APPLICATIONS INFORMATION
WU
U
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.
How Do I Test Loop Stability?
The “standard” compensation for LT1576 is a 100pF
capacitor for CC, with RC = 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
“robust” and tolerant of all these variations.
0.2ms/DIV
1576 F14
10mV/DIV
VOUT AT
IOUT = 500mA
BEFORE FILTER
VOUT AT
IOUT = 500mA
AFTER FILTER
LOAD PULSE
THROUGH 50
f
≈ 780Hz
5A/DIV
VOUT AT
IOUT = 50mA
AFTER FILTER
Figure 14. Loop Stability Check
TO
OSCILLOSCOPE
SYNC
ADJUSTABLE
DC LOAD
ADJUSTABLE
INPUT SUPPLY
100Hz TO 1kHz
100mV TO 1VP-P
100
F TO
1000
F
RIPPLE FILTER
1576 F13
TO X1
OSCILLOSCOPE
PROBE
3300pF
330pF
50
470
4.7k
SWITCHING
REGULATOR
+
Figure 13. Loop Stability Test Circuit
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| LT1634CMS8-1.25#TRPBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.25 V, PDSO8 |
| LT1680ISW#TRPBF | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT1702-7FB1 | 1-OUTPUT 500 W AC-DC REG PWR SUPPLY MODULE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1577 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed |
| LT1577CS-3.3/2.8 | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| LT1577CS-3.3/2.8#PBF | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| LT1577CS-3.3/2.8#TR | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| LT1577CS-3.3/2.8#TRPBF | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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