- 您现在的位置：买卖IC网 > PDF目录15293 > LTC3814IFE-5#TRPBF (Linear Technology)IC REG CTRLR BST PWM CM 16-TSSOP PDF资料下载
参数资料
| 型号： | LTC3814IFE-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 90% |
| 电源电压： | 4.5 V ~ 55 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
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
LTC3814-5
OPERATION
Main Control Loop
The LTC3814-5 is a current mode controller for DC/DC
step-up converters. In normal operation, the top MOSFET
is turned on for a ?xed interval determined by a one-shot
timer (OST). When the top MOSFET is turned off, the bot-
tom MOSFET is turned on until the current comparator
I CMP trips, restarting the one-shot timer and initiating the
next cycle. Inductor current is determined by sensing the
voltage between the PGND and SW pins using the bottom
MOSFET on-resistance. The voltage on the I TH pin sets
the comparator threshold corresponding to the inductor
peak current. The fast 25MHz error ampli?er EA adjusts
this voltage by comparing the feedback signal V FB to the
internal 0.8V reference voltage. If the load current increases,
it causes a drop in the feedback voltage relative to the
reference. The I TH voltage then rises until the average
inductor current again matches the load current.
The operating frequency is determined implicitly by the
top MOSFET on-time (t OFF ) and the duty cycle required to
maintain regulation. The one-shot timer generates a top
MOSFET on-time that is inversely proportional to the I OFF
current and proportional to the V OFF voltage. Connecting
V OUT to I OFF and V IN to V OFF with a resistive divider keeps
the frequency approximately constant with changes in V IN .
The nominal frequency can be adjusted with an external
resistor R OFF .
Pulling the RUN/SS pin low forces the controller into its
in an overvoltage condition, M2 is turned off and M1 is
turned on immediately and held on until the overvoltage
condition clears.
The LTC3814-5 provides an undervoltage lockout com-
parator for the INTV CC supply. The INTV CC UV threshold
is 4.2V to guarantee that the MOSFETs have suf?cient
gate drive voltage before turning on. If INTV CC is under
the UV threshold, the LTC3814-5 is shut down and the
drivers are turned off.
Strong Gate Drivers
The LTC3814-5 contains very low impedance drivers ca-
pable of supplying amps of current to slew large MOSFET
gates quickly. This minimizes transition losses and allows
paralleling MOSFETs for higher current applications. A
60V ?oating high side driver drives the topside MOSFET
and a low side driver drives the bottom side MOSFET
(see Figure 1). The bottom side driver is supplied directly
from the INTV CC pin. The top MOSFET drivers are biased
from ?oating bootstrap capacitor C B , which normally is
recharged during each off cycle through an external diode
from INTV CC when the top MOSFET turns off. In an output
overvoltage condition, where it is possible that the bot-
tom MOSFET will be off for an extended period of time,
an internal timeout guarantees that the bottom MOSFET
is turned on at least once every 25μs for one top MOSFET
on-time period to refresh the bootstrap capacitor.
shutdown state, turning off both M1 and M2. Forcing a
voltage above 0.9V will turn on the device.
INTV CC
V IN
+
Fault Monitoring/Protection
Constant off-time current mode architecture provides ac-
curate cycle-by-cycle current limit protection—a feature
LTC3814-5
INTV CC
BOOST
TG
D B
C B
L
C IN
that is very important for protecting the high voltage
power supply from output overcurrent conditions. The
SW
V OUT
cycle-by-cycle current monitor guarantees that the induc-
tor current will never exceed the value programmed on
PGND
BG
M2
M1
+
C OUT
the V RNG pin.
Overvoltage and undervoltage comparators OV and UV
pull the PGOOD output low if the output feedback voltage
38145 F01
Figure 1. Floating TG Driver Supply and Negative BG Return
exits a ±10% window around the regulation point after the
internal 125μs power bad mask timer expires. Furthermore,
38145fc
10
相关PDF资料 |
PDF描述 |
|---|---|
| H2AAT-10102-Y4-ND | JUMPER-H1502TR/A2015Y/H1502TR 2" |
| LTC1625CS | IC REG CTRLR BUCK PWM CM 16-SOIC |
| H2AAT-10102-W4-ND | JUMPER-H1502TR/A2015W/H1502TR 2" |
| LTC3810IG#TRPBF | IC REG CTRLR BUCK PWM CM 28-SSOP |
| H2AAT-10102-V4-ND | JUMPER-H1502TR/A2015V/H1502TR 2" |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3816EFE#PBF | 功能描述:IC DC-DC CTLR S-PHASE 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC3816EFE#TRPBF | 功能描述:IC CONTROLLER S-PHASE 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3816EUHF#PBF | 功能描述:IC DC-DC CTLR S-PHASE 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC3816EUHF#TRPBF | 功能描述:IC CONTROLLER S-PHASE 32QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3816IFE#PBF | 功能描述:IC CONTROLLER S-PHASE 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。