- 您现在的位置：买卖IC网 > PDF目录1832 > LTC3833EFE#PBF (Linear Technology)IC REG CTRLR BUCK PWM CM 20TSSOP PDF资料下载
参数资料
| 型号： | LTC3833EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20TSSOP |
| 标准包装： | 74 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2.2MHz |
| 电源电压： | 4.5 V ~ 38 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LTC3833
APPLICATIONS INFORMATION
The Typical Application on the first page of this data sheet
is a basic LTC3833 application circuit. The LTC3833 can be
configured to sense the inductor current either through a
series sense resistor, R SENSE , or through an RC filter across
the inductor (DCR). The choice between the two current
sensing schemes is largely a design trade-off between
cost, power consumption and accuracy. DCR sensing
is becoming popular because it saves expensive current
sensing resistors and is more power efficient, especially
in high current applications. However, current sensing
resistors provide the most accurate current limits for the
controller. Once the required output voltage and operat-
ing frequency have been determined, external component
selection is driven by load requirements, and begins with
the selection of inductor and current sensing components.
Next, the power MOSFETs are selected. Finally, input and
output capacitors are selected.
Output Voltage Programming and
Differential Output Sensing
The LTC3833 integrates differential output sensing with
output voltage programming, allowing for simple and
seamless design. As shown in Figure 1, the output voltage
is programmed by an external resistor divider from the
regulated output point to its ground reference. The resis-
tive divider is tapped by the V OSNS+ pin, and the ground
reference is sensed by V OSNS– . An optional feed-forward
capacitor, C FF , can be used to improve the transient
performance of the regulator system as discussed under
OPTI-LOOP ? Compensation. The resulting output voltage
is given according to the following equation:
More precisely, the V OUT value programmed in the previous
equation is with respect to the output’s ground reference,
and thus is a differential quantity. For example, if V OUT is
programmed to 5V and the output ground reference is at
–0.5V, then the output will be 4.5V with respect to signal
ground. The minimum differential output voltage is limited
to the internal reference, 0.6V, and the maximum differential
output voltage is 5.5V.
The V OSNS+ pin is high impedance with no input bias cur-
rent. The V OSNS– pin has about 35μA of current flowing
out of the pin.
Differential output sensing allows for more accurate output
regulation in high power distributed systems having large
line losses. Figure 2 illustrates the potential variations in
the power and ground lines due to parasitic elements.
These variations are exacerbated in multi-application
systems with shared ground planes. Without differential
output sensing, these variations directly reflect as an error
in the regulated output voltage. The LTC3833’s differential
output sensing can correct for up to ±500mV of variation
in the output’s power and ground lines.
The LTC3833’s differential output sensing scheme is
distinct from conventional schemes where the regulated
output and its ground reference are directly sensed with
a difference amplifier whose output is then divided down
with an external resistive divider and fed into the error
amplifier input. This conventional scheme is limited by
the common mode input range of the difference amplifier
and typically limits differential sensing to the lower range
of output voltages.
V OUT = 0.6V ? ? 1 + FB2 ?
C FF
R FB2
? R ?
? R FB1 ?
LTC3833
(OPT)
V OSNS+
R FB1
V OSNS–
Figure 1. Setting Output Voltage
V OUT
C OUT
3833 F01
The LTC3833 allows for seamless differential output
sensing by sensing the resistively divided feedback volt-
age differentially. This allows for differential sensing in
the full output range from 0.6V to 5.5V. The difference
amplifier of the LTC3833 has a –3dB bandwidth of 8MHz,
high enough to not affect main loop compensation and
transient behavior.
To avoid noise coupling into V OSNS+ , the resistor divider
should be placed near the V OSNS+ and V OSNS– pins and
physically close to the LTC3833. The remote output and
ground traces should be routed together as a differential
pair to the remote output. These traces should be termi-
nated as close as physically possible to the remote output
3833f
13
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3834EFE#PBF | IC REG CTRLR BUCK PWM CM 20TSSOP |
| LTC3835IFE#PBF | IC REG CTRLR BUCK PWM CM 20TSSOP |
| LTC3836EUFD#TRPBF | IC REG CTRLR BUCK PWM CM 28-QFN |
| LTC3838IFE#TRPBF | IC REG CTRLR BUCK PWM CM 38TSSOP |
| LTC3839EUH#PBF | IC REG CTRLR BUCK PWM CM 32-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3833EUDC#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3833EUDC#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3833IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3833IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3833IUDC#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。