- 您现在的位置：买卖IC网 > PDF目录15101 > LT3758MPMSE#TRA1PBF (Linear Technology)IC REG CTRLR PWM CM 10-MSOP PDF资料下载
参数资料
| 型号： | LT3758MPMSE#TRA1PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 10-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 5.5 V ~ 100 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -55°C ~ 150°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）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页第10页第11页当前第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页第33页第34页第35页第36页
LT3758/LT3758A
APPLICATIONS INFORMATION
As illustrated in Figure 2, a trade-off between the operating
frequency and the size of the power MOSFET may be needed
in order to maintain a reliable IC junction temperature.
Prior to lowering the operating frequency, however, be
sure to check with power MOSFET manufacturers for their
most recent low Q G , low R DS(ON) devices. Power MOSFET
manufacturing technologies are continually improving, with
newer and better performance devices being introduced
almost yearly.
An effective approach to reduce the power consumption
of the internal LDO for gate drive is to tie the INTV CC pin
to an external voltage source high enough to turn off the
internal LDO regulator.
If the input voltage V IN does not exceed the absolute
maximum rating of both the power MOSFET gate-source
voltage (V GS ) and the INTV CC overvoltage lockout threshold
voltage (17.5V), the INTV CC pin can be shorted directly
to the V IN pin. In this condition, the internal LDO will be
turned off and the gate driver will be powered directly
from the input voltage V IN . With the INTV CC pin shorted to
V IN , however, a small current (around 16μA) will load the
INTV CC in shutdown mode. For applications that require
the lowest shutdown mode input supply current, do not
connect the INTV CC pin to V IN .
A resistor R VCC can be connected, as shown in Figure 3, to
limit the inrush current from V OUT . Regardless of whether
or not the INTV CC pin is connected to an external voltage
source, it is always necessary to have the driver circuitry
bypassed with a 4.7μF low ESR ceramic capacitor to
ground immediately adjacent to the INTV CC and GND pins.
Operating Frequency and Synchronization
The choice of operating frequency may be determined
by on-chip power dissipation, otherwise it is a trade-off
between efficiency and component size. Low frequency
operation improves efficiency by reducing gate drive cur-
rent and MOSFET and diode switching losses. However,
lower frequency operation requires a physically larger
inductor. Switching frequency also has implications for
loop compensation. The LT3758 uses a constant-frequency
architecture that can be programmed over a 100kHz to
1000kHz range with a single external resistor from the
RT pin to ground, as shown in Figure 1. The RT pin must
have an external resistor to GND for proper operation of
the LT3758. A table for selecting the value of R T for a given
operating frequency is shown in Table 1.
Table 1. Timing Resistor (R T ) Value
SWITCHING FREQUENCY (kHz) R T (kΩ)
In SEPIC or flyback applications, the INTV CC pin can be
connected to the output voltage V OUT through a blocking
diode, as shown in Figure 3, if V OUT meets the following
conditions:
1. V OUT < V IN (pin voltage)
2. V OUT < 17.5V
3. V OUT < maximum V GS rating of power MOSFET
100
200
300
400
500
600
700
800
900
140
63.4
41.2
30.9
24.3
19.6
16.5
14
12.1
R VCC
LT3758 D VCC
INTV CC V OUT
C VCC
4.7μF
GND
3758 F03
Figure 3. Connecting INTV CC to V OUT
1000 10.5
The operating frequency of the LT3758 can be synchronized
to an external clock source. By providing a digital clock
signal into the SYNC pin, the LT3758 will operate at the
SYNC clock frequency. If this feature is used, an R T resistor
should be chosen to program a switching frequency 20%
slower than SYNC pulse frequency. It is recommended the
SYNC pulse have a minimum pulse width of 200ns. Tie
the SYNC pin to GND if this feature is not used.
3758afd
12
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3880EUJ-1#TRMPBF | IC REG CTRLR BUCK PWM CM 40-QFN |
| VE-J4K-EW-F1 | CONVERTER MOD DC/DC 40V 100W |
| X40021S14IZ-AT1 | IC VOLTAGE MONITOR DUAL 14-SOIC |
| X4043S8Z-2.7AT1 | IC CPU SUPERV 4K EEPROM 8-SOIC |
| VE-J4J-EW-F2 | CONVERTER MOD DC/DC 36V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3759 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Voltage Range |
| LT3759EMSE#PBF | 功能描述:IC REG CTRLR BST INV PWM 12-MSOP 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 |
| LT3759EMSE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 12-MSOP 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: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) |
| LT3759HMSE#PBF | 功能描述:IC REG CTRLR BST INV PWM 12-MSOP 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: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) |
| LT3759HMSE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 12-MSOP 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: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。