- 您现在的位置：买卖IC网 > PDF目录13071 > LTC3714EG#TR (Linear Technology)IC STP-DWN CNTRLR W/OPAMP 28SSOP PDF资料下载
参数资料
| 型号： | LTC3714EG#TR |
| 厂商： | Linear Technology |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC STP-DWN CNTRLR W/OPAMP 28SSOP |
| 标准包装： | 2,000 |
| 应用： | 控制器，Intel Pentium? |
| 输入电压： | 4 V ~ 36 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 1.75 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC3714EGTR |
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页当前第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
LTC3714
APPLICATIONS INFORMATION
V OUT
R VON1
30k
R VON2
100k
R C
C C
C VON
0.01μF
V ON
LTC3714
I TH
3714 F04a
V OUT
INTV CC
R VON1
3k
10k
Q1
2N5087
R VON2
10k
C VON
0.01μF
R C
C C
V ON
LTC3714
I TH
3714 F04b
(4a)
Figure 4. Correcting Frequency Shift with Load Current Changes
(4b)
Δ I L = ? OUT ? ? 1 ? OUT ?
? V
V OUT ?
? ?
L = ??
? ? 1 ?
?
V IN(MAX) ? ?
? f Δ I L(MAX) ? ?
I RMS ? I OUT(MAX)
V OUT V IN
InductorSelection
Given the desired input and output voltages, the induc-
tor value and operating frequency determine the ripple
current:
? V ? ? V ?
? fL ? ? V IN ?
Lower ripple current reduces cores losses in the inductor,
ESR losses in the output capacitors and output voltage
ripple. Highest efficiency operation is obtained at low
frequency with small ripple current. However, achieving
this requires a large inductor. There is a tradeoff between
component size, efficiency and operating frequency.
A reasonable starting point is to choose a ripple current
that is about 40% of I OUT(MAX) . The largest ripple current
occurs at the highest V IN . To guarantee that ripple current
does not exceed a specified maximum, the inductance
should be chosen according to:
OUT
? ?
Once the value for L is known, the type of inductor must be
selected. A variety of inductors designed for high current,
low voltage applications are available from manufacturers
such as Sumida and Panasonic.
Schottky Diode D1 Selection
The Schottky diode D1 shown in Figure 1 conducts during
the dead time between the conduction of the power MOSFET
switches. It is intended to prevent the body diode of the
bottom MOSFET from turning on and storing charge during
the dead time, causing a modest (about 1%) efficiency
loss. The diode can be rated for about one half to one fifth
of the full load current since it is on for only a fraction of
the duty cycle. In order for the diode to be effective, the
inductance between it and the bottom MOSFET must be
as small as possible, mandating that these components
be placed adjacently. The diode can be omitted if the ef-
ficiency loss is tolerable.
C IN and C OUT Selection
The input capacitance C IN is required to filter the square
wave current at the drain of the top MOSFET. Use a low
ESR capacitor sized to handle the maximum RMS current.
–1
V IN V OUT
This formula has a maximum at V IN = 2V OUT , where
I RMS = I OUT(MAX) /2. This simple worst-case condition is
commonly used for design because even significant de-
viations do not offer much relief. Note that ripple current
ratings from capacitor manufacturers are often based on
only 2000 hours of life which makes it advisable to derate
the capacitor.
3714f
14
相关PDF资料 |
PDF描述 |
|---|---|
| RBC22DREN-S93 | CONN EDGECARD 44POS .100 EYELET |
| C1005X7R1H102M | CAP CER 1000PF 50V 20% X7R 0402 |
| AHA336M35D16T-F | CAP ALUM 33UF 35V 20% SMD |
| EBA50DTBZ-S664 | CONN EDGECARD 100PS R/A .125 SLD |
| MIC5239YMM | IC REG LDO ADJ .5A 8MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3716EG | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 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) |
| LTC3716EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP 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) |
| LTC3716EG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3716EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP 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) |
| LTC3717-1#PBF | 制造商:LINEAR 功能描述: 制造商:Linear Technology 功能描述: |
发布紧急采购，3分钟左右您将得到回复。