- 您现在的位置：买卖IC网 > PDF目录98002 > LT3587EUD#PBF (LINEAR TECHNOLOGY CORP) SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PQCC20 PDF资料下载
参数资料
| 型号： | LT3587EUD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 4/24页 |
| 文件大小： | 395K |
| 代理商： | LT3587EUD#PBF |
LT3587
12
3587fc
APPLICATIONS INFORMATION
current at VOUT3 to ILIMIT. Figure 4 compares the transient
responses with and without current limit when a current
overload occurs.
Figure 4. Boost3 Waveform in an Output Current
Overload Event with and Without Output Current Limit
lower than 29V is obtained by connecting a resistor from
the VOUT3 pin to the VFB3 pin such that:
RFB3 = ((VCLAMP/0.8V) – 1) 56.3k
where VCLAMP is the desired output voltage clamp level. In
this case, when the voltage level is less than VCLAMP, the
Boost3 loop regulates the voltage at the IFB3 pin to 0.8V.
When the output load fails open-circuit or is disconnected,
the voltage at IFB3 drops to reect the lower output current
and the voltage at VFB3 starts to rise. When the voltage
at VOUT3 rises to VCLAMP, the Boost3 loop then regulates
the voltage at the VFB3 pin to 0.8V, limiting the voltage
level at VOUT3 to VCLAMP. Figure 5 contrasts the transient
responses with and without programmed VCLAMP when
the output load is disconnected.
Figure 5. Boost3 Output Open-Circuit Waveform with
and Without Programmed Output Voltage Clamp
3587 F04a
VVIN = 3.6V
WITHOUT CURRENT LIMIT: IFB3
CONNECTED TO GND
VOUT3 STAYS AT 15V, OUTPUT CURRENT
INCREASES FROM 20mA TO 40mA
IL4
200mA/DIV
VVOUT3
5V/DIV
IVOUT3
13mA/DIV
200μs/DIV
15V
20mA
LOAD STEP
3587 F04b
VVIN = 3.6V
WITH 20mA CURRENT LIMIT: RIFB3 = 8.06k
OUTPUT CURRENT STAYS AT 20mA,
VOUT3 DROPS FROM 15V TO 7.5V
IL4
200mA/DIV
VVOUT3
5V/DIV
IVOUT3
13mA/DIV
200μs/DIV
15V
20mA
LOAD STEP
3587 F05a
VVIN = 3.6V
WITHOUT PROGRAMMED OUTPUT VOLTAGE
CLAMP: VFB3 CONNECTED TO GND
IL4
200mA/DIV
VVOUT3
10V/DIV
200μs/DIV
20V
OUTPUT LOAD
DISCONNECTED
3587 F05b
VVIN = 3.6V
WITH PROGRAMMED OUTPUT
VOLTAGE CLAMP AT 24V
IL4
200mA/DIV
VVOUT3
10V/DIV
200μs/DIV
20V
OUTPUT LOAD
DISCONNECTED
The LT3587 CAP3 pin has an internal overvoltage protec-
tion. When the voltage at the CAP3 pin is driven above
29V (typ), the Boost3 loop is disabled and the SW3 pin
stops switching.
When congured as a boost current regulator, a feedback
resistor from the IFB3 pin to ground sets the output cur-
rent at VOUT3 at a xed level. In this case, if the VFB3 pin is
grounded then the overvoltage protection defaults to the
open-circuit clamp voltage level of 29V. A voltage clamp
相关PDF资料 |
PDF描述 |
|---|---|
| LT3587EUD#TRPBF | SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PQCC20 |
| LT6600CS8#TR | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| LTC1043MD#PBF | SPECIALTY ANALOG CIRCUIT, CDIP18 |
| LTC1043MD883C | SPECIALTY ANALOG CIRCUIT, CDIP18 |
| LTC1147LCS8-3.3#TR | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3587EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Monolithic Inverter and Dual Boost |
| LT3590 | 制造商:LINER 制造商全称:Linear Technology 功能描述:60V Triple Step-Down LED Driver Programmable Temperature Protection |
| LT3590EDC#PBF | 制造商:Linear Technology 功能描述:IC LED DRIVER BULK MODE 48V 制造商:Linear Technology 功能描述:IC, LED DRIVER, BULK MODE, 48V |
| LT3590EDC#TRMPBF | 功能描述:IC LED DRIVER WHITE BCKLGT 6-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3590EDC#TRPBF | 功能描述:IC LED DRIVER WHITE BCKLGT 6-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
发布紧急采购，3分钟左右您将得到回复。