参数资料
| 型号： | LTC3813EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 28-SSOP |
| 标准包装： | 47 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 7 V ~ 75 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 ~ 85°C |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
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页当前第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
LTC3813
APPLICATIONS INFORMATION
The required inductance can then be calculated to be:
where the ?rst term is due to the bulk capacitance and
L =
V IN(MIN) ? D MAX
f ? I L
second term due to the ESR.
For many designs it is possible to choose a single capacitor
type that satis?es both the ESR and bulk C requirements
+
1 D MAX
Therequiredsaturationoftheinductorshouldbechosen
to be greater than the peak inductor current:
I O(MAX) I L
I L(SAT)
2
Once the value for L is known, the type of inductor must be
for the design. In certain demanding applications, however,
the ripple voltage can be improved signi?cantly by con-
necting two or more types of capacitors in parallel. For
example, using a low ESR ceramic capacitor can minimize
the ESR step, while an electrolytic capacitor can be used
to supply the required bulk C.
selected. High ef?ciency converters generally cannot afford
the core loss found in low cost powdered iron cores, forcing
L
D
V OUT
the use of more expensive ferrite, molypermalloy or Kool Mμ ?
cores. A variety of inductors designed for high current, low
V IN
SW
C OUT
R L
voltage applications are available from manufacturers such
as Sumida, Panasonic, Coiltronics, Coilcraft and Toko.
8a. Circuit Diagram
Schottky Diode D1 Selection
The Schottky diode D1 shown in the front page schematic
I L
I IN
conducts during the dead time between the conduction of
the power MOSFET switches. It is intended to prevent the
body diode of the synchronous MOSFET from turning on
8b. Inductor and Input Currents
and storing charge during the dead time, which can cause
a modest (about 1%) ef?ciency loss. The diode can be
rated for about one half to one ?fth of the full load current
since it is on for only a fraction of the duty cycle. The peak
reverse voltage that the diode must withstand is equal to
the regulator output voltage. In order for the diode to be
I SW
t ON
8c. Switch Current
effective, the inductance between it and the synchronous
MOSFET must be as small as possible, mandating that
I D
t OFF
I O
these components be placed adjacently. The diode can
be omitted if the ef?ciency loss is tolerable.
Output Capacitor Selection
In a boost converter, the output capacitor requirements
8d. Diode and Output Currents
ΔV COUT
V OUT
(AC)
are demanding due to the fact that the current waveform
is pulsed. The choice of component(s) is driven by the
ΔV ESR
RINGING DUE TO
TOTAL INDUCTANCE
(BOARD + CAP)
acceptable ripple voltage which is affected by the ESR,
ESL and bulk capacitance as shown in Figure 8e. The total
8e. Output Voltage Ripple Waveform
3813 F08
output ripple voltage is:
Figure 8. Switching Waveforms for a Boost Converter
V OUT = I O(MAX)
1
f ? C OUT
+
ESR
1– D MAX
3813fb
18
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3814EFE-5#PBF | IC REG CTRLR BST PWM CM 16-TSSOP |
| LTC3816IFE#TRPBF | IC CONTROLLER S-PHASE 38TSSOP |
| LTC3819EG#TRPBF | IC CNTRLR STEP DOWN 36-SSOP |
| LTC3822EGN-1#PBF | IC REG CTRLR BUCK PWM CM 16-SSOP |
| LTC3822EMSE#TRPBF | IC REG CTRLR BUCK PWM CM 10-MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3813IG#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-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: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 |
| LTC3813IG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-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: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 |
| LTC3814EFE-5#PBF | 功能描述:IC REG CTRLR BST PWM CM 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3814EFE-5#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 16-TSSOP 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) |
| LTC3814IFE-5#PBF | 功能描述:IC REG CTRLR BST PWM CM 16-TSSOP 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。