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參數(shù)資料
| 型號(hào)： | LT1376IN8#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 500K |
| 代理商： | LT1376IN8#TR |
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20
LT1375/LT1376
13756fd
APPLICATIONS INFORMATION
WU
U
Error amplifier transconductance phase and gain are shown
in Figure 14. The error amplifier can be modeled as a
transconductance of 2000
Mho, with an output imped-
ance of 200k
in parallel with 12pF. 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 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 15, full loop phase/gain characteristics are
shown with a compensation capacitor of 0.0033
F, giving
the error amplifier a pole at 240Hz, with phase rolling off
to 90
° and staying there. The overall loop has a gain of
introduce multiple poles into the feedback loop. The
inductor and output capacitor on a conventional step-
down converter actually form a resonant tank circuit that
can exhibit peaking and a rapid 180
° phase shift at the
resonant frequency. By contrast, the LT1376 uses a “cur-
rent mode” architecture to help alleviate phase shift cre-
ated by the inductor. The basic connections are shown in
Figure 12. Figure 13 shows a Bode plot of the phase and
gain of the power section of the LT1376, measured from
the VC pin to the output. Gain is set by the 2A/V transcon-
ductance of the LT1376 power section and the effective
complex impedance from output to ground. Gain rolls off
smoothly above the 100Hz 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 fre-
quency (
≈16kHz) set by capacitor ESR (0.1).
Figure 13. Response from VC Pin to Output
Figure 15. Overall Loop Characteristics
FREQUENCY (Hz)
GAIN:
V
C
PIN
TO
OUTPUT
(dB)
PHASE:
V
C PIN
TO
OUTPUT
(DEG)
40
20
0
–20
–40
40
0
–40
–80
–120
10
1k
10k
1M
1375/76 F13
100
100k
GAIN
PHASE
VIN = 10V
VOUT = 5V
IOUT = 500mA
FREQUENCY (Hz)
LOOP
GAIN
(dB)
LOOP
PHASE
(DEG)
80
60
40
20
0
–20
200
150
100
50
0
–50
10
1k
10k
1M
1375/76 F15
100
100k
GAIN
PHASE
VIN = 10V
VOUT = 5V, IOUT = 500mA
COUT = 100F, 10V, AVX TPS
CC = 3.3nF, RC = 0, L = 10H
Figure 12. Model for Loop Response
Figure 14. Error Amplifier Gain and Phase
–
+
2.42V
VSW
VC
LT1375
LT1376
GND
1375/76 F12
R1
OUTPUT
ESR
CF
CC
RC
ERROR
AMPLIFIER
FB
+
R2
C1
CURRENT MODE
POWER STAGE
gm = 2A/V
FREQUENCY (Hz)
GAIN
(
Mho)
PHASE
(DEG)
3000
2500
2000
1500
1000
500
200
150
100
50
0
–50
100
10k
100k
10M
1375/76 F14
1k
1M
GAIN
PHASE
ROUT
200k
COUT
12pF
VC
ERROR AMPLIFIER EQUIVALENT CIRCUIT
RLOAD = 50
VFB 2 10
–3
)
(
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| LT1376IS | 功能描述:IC REG BUCK ADJ 1.5A 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1376IS#PBF | 功能描述:IC REG BUCK ADJ 1.5A 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
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