- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44994 > LTC3833IUDC#PBF (LINEAR TECHNOLOGY CORP) SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 PDF資料下載
參數(shù)資料
| 型號： | LTC3833IUDC#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 20/36頁 |
| 文件大?。?/td> | 513K |
| 代理商： | LTC3833IUDC#PBF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當(dāng)前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁
LTC3833
27
3833f
APPLICATIONS INFORMATION
The resulting maximum ripple current is:
IL =
1.2V
350kHz 0.56H
1–
1.2V
24V
≈ 5.8A
Often in high power applications, DCR current sensing is
preferred over RSENSE in order to maximize efficiency. In
order to determine the DCR filter values, first the induc-
tor manufacturer has to be chosen. For this design, the
Vishay IHLP-4040DZ-01 model is chosen with a value of
0.56μH and DCRMAX =1.8mΩ. This implies that:
VSENSE(MAX) = DRCMAX at 25°C [1 + 0.4% (TL(MAX)
– 25°C)] [IOUT(MAX) – IL/2]
= 1.8mΩ [1 + 0.4% (100°C – 25°C)]
[15A – 5.8A/2]
≈ 28.3mV
The maximum sense voltage is within the range that
LTC3833 can handle without any additional scaling. There-
fore, the DCR filter consists of a simple RC filter across
the inductor. If the C is chosen to be 0.1F, then the R can
be calculated as:
RDCR =
L
DCRMAX CDCR
=
0.56H
1.8m
0.1F
≈ 3.11k
The closest standard value is 3.09k.
The resulting value of VRNG with a 50% design margin
factor is:
VRNG = VSENSE(MAX)/0.05 MF
= 28.3mV/0.05 1.5 ≈ 850mV
To generate the VRNG voltage, connect a resistive divider
from INTVCC to SGND with RDIV1 = 52.3k and RDIV2 =
10k.
For the external N-channel MOSFETs, Renesas RJK-
0305DBP (RDS(ON) = 13mΩ max, CMILLER = 150pF, VGS
= 4.5V,
θJA = 40°C/W, TJ(MAX) = 150°C) is chosen for the
top MOSFET (main switch), and RJK0330DBP (RDS(ON)
= 3.9mΩ max, VGS = 4.5V, θJA = 40°C/W, TJ(MAX) =
150°C) is chosen for the bottom MOSFET (synchronous
switch). The power dissipation and the resulting junction
temperature for each MOSFET can be calculated for VIN
= 24V and TA = 75°C:
PTOP =
1.2V
24V
15A
( )2 13m
(
) 1+0.4
(
)+ 24V
( )2
15A
2
150pF
(
) 2.5
5.3V – 3V
+
1.2
3V
350kHz
≈ 0.54W
TJ(TOP) = 75°C+ 0.54W
(
) 40°C
W
≈ 97°C
PBOT =
24V – 1.2V
24V
15A
( )2 3.9m
(
) 1+0.4
(
)≈1.2W
TJ(BOT) = 75°C+ 1.2W
(
) 40°C
W
= 123°C
These numbers show that careful attention should be paid
to proper heat sinking when operating at higher ambient
temperatures.
Select CIN to give an RMS current rating greater than 7A
at 75°C. The output capacitor COUT is chosen for a low
ESR of 4.5mΩ to minimize output voltage changes due to
inductor ripple current and load steps. The output voltage
ripple is given as:
VOUT(RIPPLE) = IL(MAX) ESR = (5.8A)(4.5mΩ)
≈ 26mV
However, a 0A to 10A load step will cause an output
change of up to:
VOUT(STEP) = ILOAD ESR = (10A)(4.5mΩ) = 45mV
Optional 100μF ceramic output capacitors are included to
minimize the effect of ESR and ESL in the output ripple
and to improve load step response.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3833EFE#TRPBF | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| LTC3833EUDC#TRPBF | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3833EUDC#PBF | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3833IFE#PBF | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| LTC3835IGN-1#TR | 3 A SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3834EDHC-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-DFN 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) |
| LTC3834EDHC-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-DFN 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:2,500 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 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3834EFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC3834EFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP 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 |
| LTC3834EGN-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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:2,500 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 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。