- 您现在的位置：买卖IC网 > PDF目录30771 > LTC3862HGN#PBF (LINEAR TECHNOLOGY CORP) DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 PDF资料下载
参数资料
| 型号： | LTC3862HGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-24 |
| 文件页数： | 21/40页 |
| 文件大小： | 613K |
| 代理商： | LTC3862HGN#PBF |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页
LTC3862
28
3862fb
For a boost converter where the current limit value is
chosen to be 30% higher than the maximum load current,
the peak current in the MOSFET and sense resistor is:
II
n
I
SW MAX
R SENSE
OMAX
()
(
)
(
.
==
+
1
2
13
χ
))
–
1DMAX
The sense resistor value is then:
R
Vn
D
SENSE
SENSE MAX
MAX
=
()
+
()
–
.
1
13
1
2
χ
()
IOMAX
Again, the factor n is the number of phases used, and
χ
represents the percentage ripple current in the inductor.
The number 1.3 represents the factor by which the cur-
rent limit exceeds the maximum load current, IO(MAX).
For example, if the current limit needs to exceed the
maximum load current by 50%, then the 1.3 factor should
be replaced with 1.5.
The average power dissipated in the sense resistor can
easily be calculated as:
P
I
nD
R
RSENSE
OMAX
MAX
SEN
()
.
–
=
()
13
1
2
S
SE
MAX
D
This equation assumes no temperature coefcient for
the sense resistor. If the resistor chosen has a signicant
temperature coefcient, then substitute the worst-case
high resistance value into the equation.
The resistor temperature can be calculated using the
equation:
TD = TA + PR(SENSE) RTH(JA)
Selecting the Output Diodes
To maximize efciency, a fast switching diode with low
forward drop and low reverse leakage is required. The
output diode in a boost converter conducts current during
the switch off-time. The peak reverse voltage that the diode
must withstand is equal to the regulator output voltage.
The average forward current in normal operation is equal
to the output current, and the peak current is equal to the
peak inductor current:
I
n
I
D
DPEAK
OMAX
MAX
()
–
=+
1
21
χ
Although the average diode current is equal to the output
current, in very high duty cycle applications (low VIN to
high VOUT) the peak diode current can be several times
higher than the average, as shown in Figure 21. In this
case check the diode manufacturer’s data sheet to ensure
that its peak current rating exceeds the peak current in
the equation above. In addition, when calculating the
power dissipation in the diode, use the value of the
forward voltage (VF) measured at the peak current, not
the average output current. Excess power will be dissi-
pated in the series resistance of the diode, which would
not be accounted for if the average output current and
forward voltage were used in the equations. Finally, this
APPLICATIONS INFORMATION
Figure 21. Diode Current Waveform for a
High Duty Cycle Application
SW NODE
10V/DIV
INDUCTOR
CURRENT
2A/DIV
DIODE
CURRENT
2A/DIV
1μs/DIV
3862 F21
VIN = 6V
VOUT = 24V
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3862IGN#PBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| LTC3867IUF#PBF | 0.1 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| LTC4000IUFD#PBF | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28 |
| LTC4000EUFD#PBF | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28 |
| LTC4000EUFD#TRPBF | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3862HUH#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-QFN 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 |
| LTC3862HUH#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 24-QFN 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 |
| LTC3862HUH-1#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-QFN 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 |
| LTC3862HUH-1#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 24-QFN 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 |
| LTC3862HUH-2#PBF | 功能描述:IC REG CTRLR BST PWM CM 24-QFN 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 |
发布紧急采购，3分钟左右您将得到回复。