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参数资料
| 型号： | LT3782AEFE |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件页数： | 3/20页 |
| 文件大小： | 233K |
| 代理商： | LT3782AEFE |
LT3782A
11
3782af
The Peak and Average Input Currents
The control circuit in the LT3782A measures the input cur-
rent by using a sense resistor in each MOSFET source, so
the output current needs to be reected back to the input
in order to dimension the power MOSFET properly. Based
on the fact that, ideally, the output power is equal to the
input power, the maximum average input current is:
I
IN(MAX) =
I
O(MAX)
1– D
MAX
The peak current is:
I
IN(PEAK) = 1.2
I
O(MAX)
1– D
MAX
The maximum duty cycle, DMAX, should be calculated at
minimum VIN.
Power Inductor Selection
In a boost circuit, a power inductor should be designed
to carry the maximum input DC current. The inductance
should be small enough to generate enough ripple current
to provide adequate signal to noise ratio to the LT3782A.
An empirical starting of the inductor ripple current (per
phase) is about 40% of maximum DC current, which is
half of the input DC current in a 2-phase circuit:
ΔIL 40%
I
OUT(MAX) VOUT
2V
IN
= 20%
I
OUT(MAX) VOUT
V
IN
where VIN, VOUT and IOUT are the DC input voltage, output
voltage and output current, respectively.
And the inductance is estimated to be:
L =
V
IN D
f
s ΔIL
where fs is the switching frequency per phase.
The saturation current level of inductor is estimated to
be:
I
SAT ≥
ΔIL
2
+
I
IN
2
70%
I
OUT(MAX) VOUT
V
IN(MIN)
Sense Resistor Selection
During the switch on-time, the control circuit limits the
maximum voltage drop across the sense resistor to about
63mV. The peak inductor current is therefore limited to
63mV/R. The relationship between the maximum load
current, duty cycle and the sense resistor RSENSE is:
R ≤ VSENSE(MAX)
1– D
MAX
1.2
I
O(MAX)
2
Power MOSFET Selection
Important parameters for the power MOSFET include the
drain-to-source breakdown voltage (BVDSS), the threshold
voltage (VGS(TH)), the on-resistance (RDS(ON)) versus gate-
to-source voltage, the gate-to-source and gate-to-drain
charges (QGS and QGD, respectively), the maximum drain
current (ID(MAX)) and the MOSFET’s thermal resistances
(RTH(JC) and RTH(JA)).
APPLICATIONS INFORMATION
相关PDF资料 |
PDF描述 |
|---|---|
| LT3782AEUFD | SWITCHING CONTROLLER, PQCC28 |
| LT4356CMS-1#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| LT4356CDE-2#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| LT4356IDE-1#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| LT4356HDE-2#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3782AEFE#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-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 |
| LT3782AEFE#PBF | 制造商:Linear Technology 功能描述:Switch Regulator IC |
| LT3782AEFE#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-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: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 |
| LT3782AEFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782AEFE-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
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