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參數(shù)資料
| 型號： | LT3782IFE#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING CONTROLLER, 533 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大小： | 223K |
| 代理商： | LT3782IFE#TR |
LT3782
14
3782fg
For a given VIN and VOUT, we can calculate the duty cycle D
and then derive the output RMS ripple current from Figure
6. After choosing output capacitors with sufcient RMS
ripple current rating, we also need to consider the ESR
requirement if electrolytic caps, tantulum caps, POSCAPs
or SP CAPs are selected. Given the required output ripple
voltage spec ΔVOUT (in RMS value) and the calculated RMS
ripple current ΔIOUT, one can estimate the ESR value of
the output capacitor to be
ESR
≤ Δ
V
OUT
ΔI
OUT
External Regulator to Bias Gate Drivers
For applications with VINhigherthan24V,theICtemperature
may get too high. To reduce heat, an external regulator
between 12V to 14V should be used to override the internal
VGBIAS regulator to supply the current needed for BGATE1
and BGATE2 (see Figure 7).
Efciency Considerations
The efciency of a switching regulator is equal to the out-
put power divided by the input power (100%). Percent
efciency can be expressed as:
% Efciency = 100% – (L1 + L2 + L3 + …),
where L1, L2, etc. are the individual loss components
as a percentage of the input power. It is often useful to
analyze individual losses to determine what is limiting
the efciency and which change would produce the most
improvement. Although all dissipative elements in the
circuit produce losses, four main sources usually ac-
count for the majority of the losses in LT3782 application
circuits:
1. The supply current into VIN. The VIN current is the sum
of the DC supply current IQ (given in the Electrical Char-
acteristics) and the MOSFET driver and control currents.
The DC supply current into the VIN pin is typically about
7mA and represents a small power loss (much less
than 1%) that increases with VIN. The driver current
results from switching the gate capacitance of the power
MOSFET; this current is typically much larger than the
DC current. Each time the MOSFET is switched on and
then off, a packet of gate charge QG is transferred from
GBIAS to ground. The resulting dQ/dt is a current that
must be supplied to the GBIAS capacitor through the
VIN pin by an external supply. In normal operation:
IQ(TOT) ≈ IQ = f QG
PIC = VIN (IQ + f QG)
Figure 7
3782 F07
2μF
12V
+
GBIAS
GBIAS1
GBIAS2
LT3782
APPLICATIONS INFORMATION
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| LT3782IFE | 4 A SWITCHING CONTROLLER, 533 kHz SWITCHING FREQ-MAX, PDSO28 |
| LT3837IFE#PBF | SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3837IFE#TRPBF | SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16 |
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| LT3845AIFE#TRPBF | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
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| LT3791EFE#PBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:True Color PWM™ 標準包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓撲:線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
| LT3791EFE#TRPBF | 功能描述:IC LED DRVR CONTROL 38TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:True Color PWM™ 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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