參數(shù)資料
型號(hào)： LTC3775EMSE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, PLASTIC, MSOP-16
文件頁(yè)數(shù)： 3/34頁(yè)
文件大?。?/td> 534K
代理商： LTC3775EMSE#TRPBF
LTC3775
11
3775fa
APPLICATIONS INFORMATION
Figure 1 shows a Type 3 amplier. The transfer function of
this amplier is given by the following equation:
VCOMP
VOUT
=
–1+ sR2C1
() 1+ s(RA +R3)C3
sRA C1+C2
() 1+ s(C1||C2)R2
() 1+ sC3R3
(
)
The RC network across the error amplier and the feed-
forward components R3 and C3 introduce two pole-zero
pairs to obtain a phase boost at the system unity-gain
frequency, fC. In theory, the zeros and poles are placed
symmetrically around fC, and the spread between the zeros
and the poles is adjusted to give the desired phase boost
at fC. However, in practice, if the crossover frequency
is much higher than the LC double-pole frequency, this
method of frequency compensation normally generates
a phase dip within the unity bandwidth and creates some
concern regarding conditional stability.
If conditional stability is a concern, move the error ampli-
er’s zero to a lower frequency to avoid excessive phase
dip. The following equations can be used to compute the
feedback compensation component values:
f
switching frequency
f
LC
f
R
SW
LC
OUT
ESR
=
π
=
π
1
2
1
2
ESR OUT
C
choose:
f
crossover frequency
f
ff
C
SW
ZERR
LC
==
π
10
1
2
1(
)
R
RC
f
RR C
ff
ZRES
C
A
PERR
ESR
21
5
1
23 3
2
1
()
==
π
+
()
=
π
==
π
1
22 1
2
5
1
23 3
2
RC
C
ff
RC
PRES
C
(||
)
()
Required error amplier gain at frequency fC:
AV(CROSSOVER)
40log 1+
fC
fLC
2
–20log 1+
fC
fESR
2
–20log AMOD
()
20log
R2
RA
1+
fLC
fC
1+
fP2(RES)
fC
+
fP2(RES) –fZ2(RES)
fZ2(RES)
1+
fC
fESR
+
fLC
fESR –fLC
1+
fP2(RES)
fC
where AMOD is the modulator and line feedforward gain
and is equal to:
A
VDC
V
VV
MOD
IN MAX
MAX
SAW
≈
=
≈
()
.
/
40
0 95
125
30
Once the value of resistor RA and the pole and zero loca-
tions have been decided, the values of C1, R2, C2, R3 and
C3 can be obtained from the above equations.
Compensating a switching power supply feedback loop is
a complex task. The applications shown in this data sheet
show typical values, optimized for the power components
shown. Though similar power components should sufce,
substantially changing even one major power component
may degrade performance signicantly. Stability also may
depend on circuit board layout. To verify the calculated
component values, all new circuit designs should be
prototyped and tested for stability.
–
+
VOUT
VREF
RA
R3
C3
R2
C1
GAIN
(dB)
C2
FB
RB
COMP
FREQ
–1
+1
GAIN
PHASE
BOOST
0
PHASE
(DEG)
–90
–180
–270
–380
3775 F01
Figure 1. Type 3 Amplier Compensation
相關(guān)PDF資料
PDF描述
LTC3775IMSE#PBF SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO16
LTC3805MPMSE#PBF SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO10
LTC3805MPMSE#TR SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO10
LTC3829IFE#PBF SWITCHING REGULATOR, PDSO38
LTC3829IFE#TRPBF SWITCHING REGULATOR, PDSO38
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3775EUD#PBF 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN RoHS:是 類(lèi)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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LTC3775EUD#PBF 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN DC/DC CONTROLLER QFN16
LTC3775EUD#TRPBF 功能描述:IC REG CTRLR BUCK PWM VM 16-QFN RoHS:是 類(lèi)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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LTC3775IMSE#PBF 功能描述:IC REG CTRLR BUCK PWM VM 16-MSOP RoHS:是 類(lèi)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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LTC3775IMSE#TRPBF 功能描述:IC REG CTRLR BUCK PWM VM 16-MSOP RoHS:是 類(lèi)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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*