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| 型号： | LT1375CS8-5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 5 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
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LT1375/LT1376
APPLICATIO N S I N FOR M ATIO N
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 V C 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 μ 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 ? ).
Error amplifier transconductance phase and gain are shown
in Figure 14. 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 15, full loop phase/gain characteristics are
shown with a compensation capacitor of 0.0033 μ 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
LT1375
3000
200
LT1376
CURRENT MODE
POWER STAGE
V SW
OUTPUT
2500
PHASE
150
g m = 2A/V
ERROR
AMPLIFIER
FB
R1
2000
GAIN
100
GND
V C
2.42V
+
ESR
C1
1500
V FB ( 2 ? 10 –3
)
R OUT
200k
V C
C OUT
12pF
50
1000
ERROR AMPLIFIER EQUIVALENT CIRCUIT
0
C F
R C
C C
R2
500
100
R LOAD = 50 ?
1k 10k 100k
FREQUENCY (Hz)
1M
–50
10M
1375/76 F14
1375/76 F12
Figure 12. Model for Loop Response
Figure 14. Error Amplifier Gain and Phase
40
V IN = 10V
V OUT = 5V
40
80
GAIN
200
20
GAIN
I OUT = 500mA
0
60
40
150
100
0
–40
PHASE
20
PHASE
50
–20
–40
10
100
1k 10k
100k
–80
–120
1M
0
–20
10
V IN = 10V
V OUT = 5V, I OUT = 500mA
C OUT = 100 μ F, 10V, AVX TPS
C C = 3.3nF, R C = 0, L = 10 μ H
100 1k 10k
100k
0
–50
1M
FREQUENCY (Hz)
1375/76 F13
Figure 13. Response from V C Pin to Output
FREQUENCY (Hz)
1375/76 F15
Figure 15. Overall Loop Characteristics
13756fd
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1375CS8PBF | 制造商:Linear Technology 功能描述:Sw. Regulator Step-Down 1.5A 500kHz SO8 |
| LT1375HV | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, 500kHz Step-Down Switching Regulators |
| LT1375HVCS8 | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1375HVCS8#PBF | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT1375HVCS8#TR | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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