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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)： | 13/28頁 |
| 文件大?。?/td> | 290K |
| 代理商： | LT1576IS8#TR |
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20
LT1576/LT1576-5
APPLICATIONS INFORMATION
WU
U
the output. Gain is set by the 1.5A/V transconductance of
the LT1576 power section and the effective complex
impedance from output to ground. Gain rolls off smoothly
above the 160Hz pole frequency set by the 100
F output
capacitor. Phase drop is limited to about 85
°. Phase
recovers and gain levels off at the zero frequency (
≈16kHz)
set by capacitor ESR (0.1
).
Error amplifier transconductance phase and gain are shown
in Figure 11. The error amplifier can be modeled as a
transconductance of 1000
Mho, with an output imped-
ance of 570k
in parallel with 2.4pF. In all practical
applications, the compensation network from VC pin to
ground has a much lower impedance than the output
impedance of the amplifier at frequencies above 200Hz.
This means that the error amplifier characteristics them-
selves do not contribute excess phase shift to the loop, and
the phase/gain characteristics of the error amplifier sec-
tion are completely controlled by the external compensa-
tion network.
In Figure 12, full loop phase/gain characteristics are
shown with a compensation capacitor of 100pF, giving the
error amplifier a pole at 2.8kHz, with phase rolling off to
90
° and staying there. The overall loop has a gain of 66dB
at low frequency, rolling off to unity-gain at 58kHz. Phase
shows a two-pole characteristic until the ESR of the output
capacitor brings it back above 16kHz. Phase margin is
about 77
° at unity-gain.
FREQUENCY (Hz)
GAIN
(
Mho)
PHASE
(DEG)
2000
1500
1000
500
0
–500
200
150
100
50
0
–50
10
1k
10k
1M
1576 F11
100
100k
GAIN
PHASE
ROUT
570k
COUT
2.4pF
VC
ERROR AMPLIFIER EQUIVALENT CIRCUIT
RLOAD = 50
VFB 1 × 10
–3
)
(
–
+
1.21V
VSW
VC
LT1576
GND
1576 F09
R1
OUTPUT
ESR
CF
CC
RC
ERROR
AMPLIFIER
FB
R2
C1
CURRENT MODE
POWER STAGE
gm = 1.5A/V
+
Figure 10. Response from VC Pin to Output
FREQUENCY (Hz)
10
GAIN
(dB)
PHASE
(DEG)
40
20
0
–20
–40
40
0
–40
–80
–120
100
1k
1576 F07
10k
100k
GAIN
PHASE
VIN = 10V
VOUT = 5V
IOUT = 500mA
Figure 12. Overall Loop Characteristics
FREQUENCY (Hz)
LOOP
GAIN
(dB)
LOOP
PHASE
(DEG)
80
60
40
20
0
–20
180
135
90
45
0
–45
10
1k
10k
1M
1576 F12
100
100k
VIN = 10V
VOUT = 5V
IOUT = 500mA
COUT = 100F
10V, AVX TPS
CC = 100pF
L = 30
H
PHASE
GAIN
Figure 9. Model for Loop Response
Figure 11. Error Amplifier Gain and Phase
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相關代理商/技術參數(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 - 線性晶體管驅動器 系列:- 產品培訓模塊:More Information on LDOs 標準包裝: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） 供應商設備封裝: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 - 線性晶體管驅動器 系列:- 產品培訓模塊:More Information on LDOs 標準包裝: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） 供應商設備封裝: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 - 線性晶體管驅動器 系列:- 產品培訓模塊:More Information on LDOs 標準包裝: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） 供應商設備封裝: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 - 線性晶體管驅動器 系列:- 產品培訓模塊:More Information on LDOs 標準包裝: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） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
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