- 您现在的位置：买卖IC网 > PDF目录383291 > LTC3828EUH (LINEAR TECHNOLOGY CORP) Model HB Series Horizontal Stacking Banana Plug Patch Cord, Banana Plug Each End Operating Voltage 30VAC/60VDC Max, Current-15A Cont, Operating Temp Max +55 degrees C, Color-Red, Length-24" RoHS Compliant: Yes PDF资料下载
参数资料
| 型号： | LTC3828EUH |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Model HB Series Horizontal Stacking Banana Plug Patch Cord, Banana Plug Each End Operating Voltage 30VAC/60VDC Max, Current-15A Cont, Operating Temp Max +55 degrees C, Color-Red, Length-24" RoHS Compliant: Yes |
| 中文描述： | 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 5 X 5 MM, PLASTIC, MO-220WHHD, QFN-32 |
| 文件页数： | 10/32页 |
| 文件大小： | 396K |
| 代理商： | LTC3828EUH |
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页当前第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
10
LTC3828
3828f
(Refer to Functional Diagram)
OPERATIOU
Main Control Loop
The IC uses a constant frequency, current mode step-
down architecture with the two controller channels oper-
ating 180 degrees out of phase. During normal operation,
each top MOSFET is turned on when the clock for that
channel sets the RS latch, and turned off when the main
current comparator, I
1
, resets the RS latch. The peak
inductor current at which I
1
resets the RS latch is con-
trolled by the voltage on the I
TH
pin, which is the output of
each error amplifier EA. The V
OSENSE
pin receives the
voltage feedback signal, which is compared to the internal
reference voltage by the EA. When the load current in-
creases, it causes a slight decrease in V
OSENSE
relative to
the 0.8V reference, which in turn causes the I
TH
voltage to
increase until the average inductor current matches the
new load current. After the top MOSFET has turned off, the
bottom MOSFET is turned on until either the inductor
current starts to reverse, as indicated by current compara-
tor I
2
, or the beginning of the next cycle.
The top MOSFET drivers are biased from floating boot-
strap capacitor C
B
, which normally is recharged during
each off cycle through an external diode when the top
MOSFET turns off. As V
IN
decreases to a voltage close to
V
OUT
, the loop may enter dropout and attempt to turn on
the top MOSFET continuously. The dropout detector de-
tects this and forces the top MOSFET off for about 400ns
every tenth cycle to allow C
B
to recharge.
The main control loop is shut down by pulling the RUN pin
low. When the RUN pin reaches 1.5V, the main control
loop is enabled. When RUN1 is low, all controller functions
are shut down, including the 5V regulator.
Low Current Operation
The FCB/PLLIN pin is a multifunction pin providing two
functions: 1) to accept external clock signal; and 2) to
select among three modes of light load operations. When
the FCB/PLLIN pin voltage is below 0.8V, the controller
forces continuous PWM current mode operation. In this
mode, the top and bottom MOSFETs are alternately
turned on to maintain the output voltage independent of
direction of inductor current. When the FCB/PLLIN pin is
below V
INTVCC
– 2V but greater than 0.8V, the controller
enters Burst Mode operation. Burst Mode operation sets
a minimum output current level before inhibiting the top
switch and turns off the synchronous MOSFET(s) when
the inductor current goes negative. This combination of
requirements will, at low currents, force the I
TH
pin below
a voltage threshold that will temporarily inhibit turn-on of
both output MOSFETs until the output voltage drops.
There is 60mV of hysteresis in the burst comparator B
tied to the I
TH
pin. This hysteresis produces output
signals to the MOSFETs that turn them on for several
cycles, followed by a variable “sleep” interval depending
upon the load current. The resultant output voltage ripple
is held to a very small value by having the hysteretic
comparator after the error amplifier gain block. When the
FCB/PLLIN pin voltage is above 4.8V, the controller
operates in constant frequency mode and the synchro-
nous MOSFET is turned off when inductor current nears
zero in each cycle.
In order to prevent erratic operation if no external connec-
tions are made to the FCB/PLLIN pin, the FCB/PLLIN pin
has a 0.18
μ
A internal current source pulling the pin high.
The following table summarizes the possible states avail-
able on the FCB/PLLIN pin:
Table 1
FCB/PLLIN Pin
0V to 0.75V
Condition
Forced Continuous Both Controllers
(Current Reversal Allowed—
Burst Inhibited)
Minimum Peak Current Induces
Burst Mode Operation
No Current Reversal Allowed
Burst Mode Operation Disabled
Constant Frequency Mode Enabled
No Current Reversal Allowed
No Minimum Peak Current
0.85V < V
FCB/PLLIN
< 4.3V
>4.8V
Besides providing a logic input to force continuous
operation, the FCB/PLLIN pin acts as the input for exter-
nal clock synchronization. Upon detecting the presence
of an external clock signal, channel 1 will lock on to this
external clock and this will be followed by channel 2 (see
Frequency Synchronization section). The LTC3828 de-
faults to forced continuous mode when sychronized to an
external clock.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3828 | 16-Bit Bus Transceiver With 3-State Outputs 48-SSOP -40 to 85 |
| LTC486 | Quad Low Power RS485 Driver |
| LTC486C | ; LED Color:Red; Luminous Intensity:63mcd; Viewing Angle:80 ; Forward Current:20mA; Forward Voltage:2.1V; Operating Temperature Range:-40 C to +100 C RoHS Compliant: Yes |
| LTC486CN | Quad Low Power RS485 Driver |
| LTC486CS | Quad Low Power RS485 Driver |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3828EUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-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: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 |
| LTC3828EUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-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: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 |
| LTC3829EFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC3829EFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP 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: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 |
| LTC3829EUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-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) |
发布紧急采购，3分钟左右您将得到回复。