参数资料
| 型号： | LT1936HMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.4A 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 31.3 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 1.4A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
LT1936
APPLICATIONS INFORMATION
complicated and the best values depend on the application
and in particular the type of output capacitor. A practical
approach is to start with one of the circuits in this data
sheet that is similar to your application and tune the com-
pensation network to optimize the performance. Stability
should then be checked across all operating conditions,
including load current, input voltage and temperature. The
LT1375 data sheet contains a more thorough discussion of
loop compensation and describes how to test the stability
using a transient load.
Figure 1 shows an equivalent circuit for the LT1936 control
loop. The error ampli?er is a transconductance ampli?er
with ?nite output impedance. The power section, consisting
of the modulator, power switch and inductor, is modeled
as a transconductance ampli?er generating an output
C OUT = 22μF
(AVX 1210ZD226MAT)
current proportional to the voltage at the V C pin. Note that
the output capacitor integrates this current, and that the
capacitor on the V C pin (C C ) integrates the error ampli?er
output current, resulting in two poles in the loop. In most
cases a zero is required and comes from either the output
capacitor ESR or from a resistor R C in series with C C .
This simple model works well as long as the value of the
inductor is not too high and the loop crossover frequency
is much lower than the switching frequency. A phase lead
capacitor (C PL ) across the feedback divider may improve
the transient response.
Figure 2 compares the transient response across several
output capacitor choices and compensation schemes.
In each case the load current is stepped from 200mA to
800mA and back to 200mA.
(2a)
(2b)
COMP
V C
C OUT = 22μF × 2
COMP
V C
V OUT
100mV/DIV
V OUT
100mV/DIV
C OUT = 150μF
(4TPC150M)
V OUT
(2c)
(2d)
COMP
V C
C OUT = 150μF
(4TPC150M)
COMP
100mV/DIV
V OUT
100mV/DIV
V C
220k
100pF
I OUT
500mA/DIV
800mA
200mA
50μs/DIV
1936 F02
Figure 2. Transient Load Response of the LT1936 with Different Output
Capacitors as the Load Current is Stepped from 200mA to 800mA. V OUT = 3.3V
1936fd
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1936IMS8E | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 36V 8-Pin MSOP EP |
| LT1936IMS8E#PBF | 功能描述:IC REG BUCK ADJ 1.4A 8MSOP 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: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 |
| LT1936IMS8E#TRPBF | 功能描述:IC REG BUCK ADJ 1.4A 8MSOP 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: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 |
| LT1936IMS8EPBF | 制造商:Linear Technology 功能描述:Switching Regulator 1.4A 500kHz MSOP8EP |
| LT1936IMS8E-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.4A, 500kHz Step-Down Switching Regulator |
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