- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄44987 > LT3837IFE#PBF (LINEAR TECHNOLOGY CORP) SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16 PDF資料下載
參數(shù)資料
| 型號(hào)： | LT3837IFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件頁(yè)數(shù)： | 17/28頁(yè) |
| 文件大?。?/td> | 247K |
| 代理商： | LT3837IFE#PBF |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)當(dāng)前第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)
LT3837
24
3837fc
APPLICATIONS INFORMATION
IC Thermal Considerations
Take care to ensure that the LT3837 junction temperature
does not exceed 125°C. Power is computed from the aver-
age supply current, the sum of quiescent supply current
(ICC in the specications) plus gate drive currents.
The primary gate drive current is computed as:
fOSC QG
where QG is the total gate charge at max VGS (obtained from
the gate charge curve) and f is the switching frequency.
Since the synchronous driver is usually driving a capacitive
load, the power dissipation is:
fOSC CS VSGMAX
where CS is the SG capacitive load and VSGMAX is the SG
pin max voltage.
So total IC dissipation is computed as:
PD(TOTAL) = VCC (ICC + f (QGPRI + CS VSGMAX))
VCC is the worst-case LT3837 supply voltage.
Junction temperature is computed as:
TJ = TA + PD θJA
where:
TA is the ambient temperature
θJA is the FE16 package junction-to-ambient thermal
impedance (40°C/W).
PC Board Layout Considerations
In order to minimize switching noise and improve output
load regulation, connect the GND pin of the LT3837 directly
to the ground terminal of the VCC decoupling capacitor,
the bottom terminal of the current sense resistor, the
ground terminal of the input capacitor, and the ground
plane (multiple vias). Place the VCC capacitor immediately
adjacent to the VCC and GND pins on the IC package.
This capacitor carries high di/dt MOSFET gate drive cur-
rents. Use a low ESR ceramic capacitor.
Take care in PCB layout to keep the traces that conduct high
switching currents short, wide and with minimal overall
loop area. These are typically the traces associated with
the switches. This reduces the parasitic inductance and
also minimizes magnetic eld radiation. Figure 9 outlines
the critical paths.
Keep electric eld radiation low by minimizing the length
and area of traces (keep stray capacitances low). The drain
of the primary side MOSFET is the worst offender in this
category. Always use a ground plane under the switcher
circuitry to prevent coupling between PCB planes.
Check that the maximum BVDSS ratings of the MOSFETs
are not exceeded due to inductive ringing. This is done by
viewing the MOSFET node voltages with an oscilloscope. If
it is breaking down either choose a higher voltage device,
add a snubber or specify an avalanche-rated MOSFET.
Place the small-signal components away from high fre-
quency switching nodes. This allows the use of a pseudo-
Kelvin connection for the signal ground, where high di/dt
gate driver currents ow out of the IC ground pin in one
direction (to the bottom plate of the VCC decoupling
capacitor) and small-signal currents ow in the other
direction.
Keep the trace from the feedback divider tap to the FB
short to preclude inadvertent pickup.
For applications with multiple switching power converters
connected to the same input supply, make sure that the
input lter capacitor for the LTC3837 is not shared with
other converters. AC input current from another converter
could cause substantial input voltage ripple and this could
interfere with the LT3837 operation. A few inches of PC
trace or wire (L
100nH) between the CIN of the LT3837
and the actual source VIN is sufcient to prevent current
sharing problems.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT3837IFE#TRPBF | SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3845AMPFE#TRPBF | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3845AIFE#TRPBF | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3845AMPFE#PBF | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3845EFE#TR | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT383L313 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Optoelectronic |
| LT3844 | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency |
| LT3844EFE | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency |
| LT3844EFE#PBF | 功能描述:IC REG CTRLR BST INV PWM 16TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤(pán) 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱(chēng):LM3754SQDKR |
| LT3844EFE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 16TSSOP RoHS:是 類(lèi)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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR) |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。