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參數(shù)資料
| 型號： | LT3782AEFE#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大小： | 233K |
| 代理商： | LT3782AEFE#TR |
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3782AEFE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782AEUFD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT3782AEUFD#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LT3782AEUFD#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3782AEUFD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
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