參數(shù)資料
型號(hào)： 1374I
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 22/32頁(yè)
文件大?。?/td> 309K
代理商： 1374I
22
LT1374
1374fb
APPLICATIO
S I
FOR
ATIO
U
Error amplifier transconductance phase and gain are
shown in Figure 11. The error amplifier can be modeled
as a transconductance of 2000
μ
Mho, with an output
imped
ance of 200k
in parallel with 12pF. In all practical
applications, the compensation network from V
C
pin to
ground has a much lower impedance than the output
impedance of the amplifier at frequencies above 500Hz.
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 1.5nF, giving the
error amplifier a pole at 530Hz, with phase rolling off to 90
°
W
U
U
and staying there. The overall loop has a gain of 74dB at
low frequency, rolling off to unity-gain at 100kHz. Phase
shows a two-pole characteristic until the ESR of the output
capacitor brings it back above 10kHz. Phase margin is
about 75
°
at unity-gain.
Analog experts will note that around 4.4kHz, phase dips
very close to the zero phase margin line. This is typical of
switching regulators, especially those that operate over a
wide range of loads. This region of low phase is not a
problem as long as it does not occur near unity-gain. In
practice, the variability of output capacitor ESR tends to
dominate all other effects with respect to loop response.
Variations in ESR willcause unity-gain to move around,
but at the same time phase moves with it so that adequate
phase margin is maintained over a very wide range of ESR
(
≥
±
3:1).
Figure 10. Response from V
C
Pin to Output
FREQUENCY (Hz)
G
C
P
C
40
20
0
–20
–40
40
0
–40
–80
–120
10
1k
10k
1M
1374 F10
100
100k
GAIN
PHASE
V
IN
= 10V
V
OUT
= 5V
I
OUT
= 2A
Figure 11. Error Amplifier Gain and Phase
FREQUENCY (Hz)
G
μ
M
P
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100
10k
100k
10M
1374 F11
1k
1M
GAIN
PHASE
R
200k
C
12pF
V
C
ERROR AMPLIFIER EQUIVALENT CIRCUIT
R
LOAD
= 50
V
FB
2
×
10
–3
)
(
Figure 9. Model for Loop Response
–
+
2.42V
V
SW
V
C
LT1374
GND
1374 F09
R1
OUTPUT
ESR
C
F
C
C
R
C
ERROR
AMPLIFIER
FB
R2
C1
CURRENT MODE
POWER STAGE
g
m
= 5.3A/V
+
FREQUENCY (Hz)
L
L
80
60
40
20
0
–20
200
150
100
50
0
–50
10
1k
10k
1M
1374 F12
100
100k
GAIN
PHASE
V
IN
= 10V
V
OUT
= 5V, I
OUT
= 2A
C
OUT
= 100
μ
C
C
= 1.5nF, R
C
= 0, L = 10
μ
H
Figure 12. Overall Loop Characteristics
相關(guān)PDF資料
PDF描述
1374I5 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
1374SN RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
1393203-4 Mid–Range PC Board Relays
1393203-5 Mid–Range PC Board Relays
1393203-8 Mid–Range PC Board Relays
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
1374I5 制造商:LINER 制造商全稱:Linear Technology 功能描述:4.5A, 500kHz Step-Down Switching Regulator
1374SN 制造商:LINER 制造商全稱:Linear Technology 功能描述:4.5A, 500kHz Step-Down Switching Regulator
1375 制造商:Abbatron/HH Smith 功能描述: 制造商:H H SMITH 功能描述: 制造商:Heyco Products Inc 功能描述:SR 15-1 WHITE 制造商:NTE Electronics 功能描述: 制造商:Pass & Seymour/Legrand 功能描述:PILOT LITE 制造商:Paladin Tools 功能描述:
13750010 制造商:Delphi Corporation 功能描述:23 WAY CONNECTOR MALE
1375005-1 功能描述:以太網(wǎng)和電信連接器 KIT FURN.OUTLET SMALLBASE LT.A RoHS:否 制造商:Pulse 產(chǎn)品:Modular Jacks 性能類別: USOC 代碼:RJ45 位置/觸點(diǎn)數(shù)量: 安裝風(fēng)格:Through Hole 端口數(shù)量:1 x 1 型式:Female 屏蔽: 電流額定值: 電壓額定值: 觸點(diǎn)電鍍: 外殼材料:Thermoplastic IP 等級(jí):
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

*
*
*