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參數(shù)資料
| 型號： | LT3741EFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1070 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 243K |
| 代理商： | LT3741EFE#PBF |
LT3741
18
3741fb
APPLICATIONS INFORMATION
the error amplier will be the compensation resistor, RC.
Use the following equation as a good starting point for
compensation component sizing:
R
C =
f
S L 1000V
V
O RS
[
Ω], C
C =
0.002
f
S
[F]
where fS is the switching frequency, L is the inductance
value, VO is the output voltage and RS is the sense resistor.
For most applications, a 4.7nF compensation capacitor
is adequate and provides excellent phase margin with
optimized bandwidth. Please refer to Table 6 for recom-
mended compensation values.
Board Layout Considerations
Average current mode control is relatively immune to the
switching noise associated with other types of control
schemes. Placing the sense resistor as close as possible
to the SENSE+ and SENSE– pins avoids noise issues. Due
to sense resistor ESL (equivalent series inductance), a
10Ω resistor in series with the SENSE+ and SENSE– pins
with a 33nF capacitor placed between the SENSE pins is
recommended. Utilizing a good ground plane underneath
the switching components will minimize interplane noise
coupling. To dissipate the heat from the switching com-
ponents, use a large area for the switching mode while
keeping in mind that this negatively affects the radiated
noise.
Average Current Mode Control Compensation
The use of average current mode control allows for precise
regulation of the inductor and load currents. Figure 11
shows the average current mode control loop used in the
LT3741, where the regulation current is programmed by
a current source and a 3k resistor.
To design the compensation network, the maximum com-
pensation resistor needs to be calculated. In current mode
controllers, the ratio of the sensed inductor current ramp
to the slope compensation ramp determines the stability
of the current regulation loop above 50% duty cycle. In
the same way, average current mode controllers require
the slope of the error voltage to not exceed the PWM ramp
slope during the switch off-time.
Since the closed-loop gain at the switching frequency
produces the error signal slope, the output impedance of
–
+
gm
ERROR AMP
MODULATOR
LOAD
RC
LRS
3k
VCTRL 11μA/V
CC
3741 F11
Figure 11. LT3741 Average Current Mode Control Scheme
Table 6. Recommended Compensation Values
VIN (V)
VO (V)
IL (A)
fSW (MHz)
L (μH)
RS (mΩ)
RC (kΩ)
CC (nF)
12
4
5
0.5
1.5
5
47.5
4.7
12
4
10
0.5
1.5
5
47.5
4.7
12
5
20
0.25
1.8
2.5
38.3
8.2
24
4
2
0.5
1.0
2.5
52.3
4.7
24
4
20
0.5
1.0
2.5
52.3
4.7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3741EFE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
| LT3741EUF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LT3741EUF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3741EUF-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
| LT3741EUF-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
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