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参数资料
| 型号： | LT3587EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ DL 20QFN |
| 标准包装： | 121 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可调至 ±32V |
| 输入电压： | 2.5 V ~ 6 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-QFN 裸露焊盘（3x3） |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3587
APPLICATIONS INFORMATION
current at V OUT3 to I LIMIT . Figure 4 compares the transient
responses with and without current limit when a current
overload occurs.
lower than 29V is obtained by connecting a resistor from
the V OUT3 pin to the V FB3 pin such that:
R FB3 = ((V CLAMP /0.8V) – 1) ? 56.3k
V VOUT3
5V/DIV
15V
where V CLAMP is the desired output voltage clamp level. In
this case, when the voltage level is less than V CLAMP , the
I VOUT3
13mA/DIV
20mA
LOAD STEP
Boost3 loop regulates the voltage at the I FB3 pin to 0.8V.
When the output load fails open-circuit or is disconnected,
the voltage at I FB3 drops to re?ect the lower output current
I L4
200mA/DIV
and the voltage at V FB3 starts to rise. When the voltage
at V OUT3 rises to V CLAMP , the Boost3 loop then regulates
the voltage at the V FB3 pin to 0.8V, limiting the voltage
V VIN = 3.6V
200μs/DIV
WITHOUT CURRENT LIMIT: I FB3
CONNECTED TO GND
V OUT3 STAYS AT 15V, OUTPUT CURRENT
INCREASES FROM 20mA TO 40mA
3587 F04a
level at V OUT3 to V CLAMP . Figure 5 contrasts the transient
responses with and without programmed V CLAMP when
the output load is disconnected.
V VOUT3
5V/DIV
15V
V VOUT3
10V/DIV
20V
OUTPUT LOAD
I VOUT3
13mA/DIV
20mA
DISCONNECTED
I L4
200mA/DIV
LOAD STEP
I L4
200mA/DIV
V VIN = 3.6V
200μs/DIV
3587 F05a
200μs/DIV
3587 F04b
V VIN = 3.6V
WITH 20mA CURRENT LIMIT: R IFB3 = 8.06k
OUTPUT CURRENT STAYS AT 20mA,
V OUT3 DROPS FROM 15V TO 7.5V
Figure 4. Boost3 Waveform in an Output Current
WITHOUT PROGRAMMED OUTPUT VOLTAGE
CLAMP: V FB3 CONNECTED TO GND
Overload Event with and Without Output Current Limit
V VOUT3
20V
10V/DIV
OUTPUT LOAD
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.
I L4
200mA/DIV
DISCONNECTED
V VIN = 3.6V
Whencon?guredasaboostcurrentregulator,afeedback
resistor from the I FB3 pin to ground sets the output cur-
rent at V OUT3 at a ?xed level. In this case, if the V FB3 pin is
200μs/DIV
WITH PROGRAMMED OUTPUT
VOLTAGE CLAMP AT 24V
3587 F05b
grounded then the overvoltage protection defaults to the
open-circuit clamp voltage level of 29V. A voltage clamp
Figure 5. Boost3 Output Open-Circuit Waveform with
and Without Programmed Output Voltage Clamp
3587fc
12
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| 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 |
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