参数资料
型号: LTC3869EUFD#PBF
厂商: Linear Technology
文件页数: 20/42页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 28-QFN
标准包装: 73
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 850kHz
占空比: 95%
电源电压: 4 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 28-WFQFN 裸露焊盘
包装: 管件
LTC3869/LTC3869-2
APPLICATIONS INFORMATION
Output Voltage Tracking
The LTC3869 allows the user to program how its output
ramps up and down by means of the TK/SS pins. Through
these pins, the output can be set up to either coincidentally
or ratiometrically track another supply’s output, as shown
in Figure 5. In the following discussions, V OUT1 refers to
the LTC3869’s output 1 as a master channel and V OUT2
refers to the LTC3869’s output 2 as a slave channel. In
practice, though, either phase can be used as the master.
To implement the coincident tracking in Figure 5a, con-
nect an additional resistive divider to V OUT1 and connect
its midpoint to the TK/SS pin of the slave channel. The
ratio of this divider should be the same as that of the
slave channel’s feedback divider shown in Figure 6a. In
this tracking mode, V OUT1 must be set higher than V OUT2 .
V OUT1
V OUT2
To implement the ratiometric tracking in Figure 6b, the
ratio of the V OUT2 divider should be exactly the same as
the master channel’s feedback divider shown in Figure 6b.
By selecting different resistors, the LTC3869 can achieve
different modes of tracking including the two in Figure 5.
So which mode should be programmed? While either
mode in Figure 5 satisfies most practical applications,
some trade-offs exist. The ratiometric mode saves a pair
of resistors, but the coincident mode offers better output
regulation.
When the master channel’s output experiences dynamic
excursion (under load transient, for example), the slave
channel output will be affected as well. For better output
regulation, use the coincident tracking mode instead of
ratiometric.
V OUT1
V OUT2
TIME
3869 F05a
TIME
3869 F08b
(5a) Coincident Tracking
(5b) Ratiometric Tracking
Figure 5. Two Different Modes of Output Voltage Tracking
V OUT1
V OUT2
V OUT1
V OUT2
TO
TK/SS2
PIN
R3
R4
R1
R2
TO
V FB1
PIN
TO
V FB2
PIN
R3
R4
TO
TK/SS2
PIN
R1
R2
TO
V FB1
PIN
TO
V FB2
PIN
R3
R4
3869 F09
(6a) Coincident Tracking Setup
(6b) Ratiometric Tracking Setup
Figure 6. Setup for Coincident and Ratiometric Tracking
38692fa
20
For more information www.linear.com/LTC3869
相关PDF资料
PDF描述
LTC3872ETS8#TRMPBF IC REG CTRLR BST PWM CM TSOT23-8
LTC3873EDDB#TRMPBF IC REG CTRLR BST FLYBK PWM 8-DFN
LTC3873ITS8-5#TRPBF IC REG CTRLR BST FLYBK TSOT23-8
LTC3876EFE#PBF IC CTLR DC/DC DDR DUAL 38-TSSOP
LTC3878EGN#PBF IC REG CTRLR BUCK PWM CM 16-SSOP
相关代理商/技术参数
参数描述
LTC3869IGN-2#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3869IGN-2#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3869IUFD#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP(0.173",4.40mm 宽) 包装:带卷 (TR)
LTC3869IUFD#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3872EDDB#PBF 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Up 2.75V to 9.8V Input 8-Pin DFN EP 制造商:Linear Technology 功能描述:BOOST 2.75 - 9.8V 550KHZ 8D 制造商:Linear Technology 功能描述:BOOST, 2.75 - 9.8V, 550KHZ, 8DFN