- 您现在的位置：买卖IC网 > PDF目录15342 > LTC3854IDDB#TRPBF (Linear Technology)IC REG CTRLR BUCK PWM CM 12-DFN PDF资料下载
参数资料
| 型号： | LTC3854IDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 12-DFN |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 98% |
| 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 ~ 85°C |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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页第13页第14页第15页第16页第17页第18页当前第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
LTC3854
APPLICATIONS INFORMATION
3) Are the SENSE– and SENSE+ leads routed together
with minimum PC trace spacing? The filter capacitor
between SENSE+ and SENSE– should be as close
as possible to the LTC3854. Ensure accurate current
sensing with Kelvin connections as shown in Figure 5.
Series resistance can be added to the SENSE lines to
increase noise rejection.
4) Does the (+) terminal of C IN connect to the drain of
the topside MOSFET(s) as closely as possible? This
capacitor provides the AC current to the MOSFET(s).
5) Is the INTV CC decoupling capacitor connected closely
between INTV CC and GND? This capacitor carries the
MOSFET driver peak currents.
6) Keep the switching node (SW), top gate node (TG),
bottom gate node (BG) and boost node (BOOST) away
from sensitive small-signal nodes, especially from the
voltage and current sensing feedback pins. All of these
nodes have very large and fast moving signals and
therefore should be kept on the “output side” (Pins
4,5,6 and 8) of the LTC3854 GND and occupy minimum
PC trace area.
CURRENT SENSE
RESISTOR
(R SENSE )
SENSE+ SENSE– 3854 F04
Figure 5. Kelvin Sensing R SENSE
PC Board Layout Debugging
It is helpful to use a DC-50MHz current probe to monitor
the current in the inductor while testing the circuit. Monitor
the output switching node (SW pin) to synchronize the
oscilloscope to the internal oscillator and probe the actual
output voltage as well. Check for proper performance over
the operating voltage and current range expected in the ap-
plication. The frequency of operation should be maintained
over the input voltage range down to dropout.
The duty cycle percentage should be maintained from cycle
to cycle in a well-designed, low noise PCB implementation.
Variation in the duty cycle at a subharmonic rate can sug-
gest noise pickup at the current or voltage sensing inputs
or inadequate loop compensation. Overcompensation of
the loop can be used to tame a poor PC layout if regula-
tor bandwidth optimization is not required. A 1Ω to 10Ω
boost resistor may help to improve noise immunity. This
resistor is placed between the BOOST pin and the node
formed by the cathode of the boost Schottky and the
positive terminal of the boost capacitor.
Investigate whether any problems exist only at higher out-
put currents or only at higher input voltages. If problems
coincide with high input voltages and low output currents,
look for capacitive coupling between the BOOST, SW, TG,
and possibly BG connections and the sensitive voltage
and current pins. The capacitor placed across the current
sensing pins needs to be placed immediately adjacent to
the pins of the IC. This capacitor helps to minimize the
effects of differential noise injection due to high frequency
capacitive coupling. If problems are encountered with
high current output loading at lower input voltages, look
for inductive coupling between C IN , Schottky and the top
MOSFET components to the sensitive current and voltage
sensing traces. In addition, investigate common ground
path voltage pickup between these components and the
GND pin of the IC.
3854fb
19
相关PDF资料 |
PDF描述 |
|---|---|
| ESC22DRTN-S13 | CONN EDGECARD 44POS .100 EXTEND |
| LTC3854IMSE#PBF | IC REG CTRLR BUCK PWM CM 12-MSOP |
| B41041A3338M | 3300UF 10V 12.5X25 SINGLE END |
| ESC22DRTH-S13 | CONN EDGECARD 44POS .100 EXTEND |
| ADM8696ARW-REEL | IC SUPERVSR MPU ADJ/RESET 16SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3854IMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 12-MSOP 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) |
| LTC3854IMSE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 12-MSOP 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) |
| LTC3855EFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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) |
| LTC3855EFE#PBF | 制造商:Linear Technology 功能描述:IC DUAL SYNC DC/DC CONTROLLER 38-TSSOP |
| LTC3855EFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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。