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LT1681ESW#PBF PDF预览

LT1681ESW#PBF

更新时间: 2024-10-03 13:09:35
品牌 Logo 应用领域
凌特 - Linear 晶体晶体管控制器
页数 文件大小 规格书
20页 301K
描述
LT1681 - Dual Transistor Synchronous Forward Controller; Package: SO; Pins: 20; Temperature Range: -40°C to 85°C

LT1681ESW#PBF 技术参数

是否Rohs认证: 符合生命周期:Transferred
零件包装代码:SOIC包装说明:SOP, SOP20,.4
针数:20Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:7.52模拟集成电路 - 其他类型:SWITCHING CONTROLLER
控制模式:CURRENT-MODE最大输入电压:18 V
最小输入电压:9 V标称输入电压:12 V
JESD-30 代码:R-PDSO-G20JESD-609代码:e3
长度:12.8 mm湿度敏感等级:1
功能数量:1端子数量:20
最高工作温度:70 °C最低工作温度:
封装主体材料:PLASTIC/EPOXY封装代码:SOP
封装等效代码:SOP20,.4封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):260
认证状态:Not Qualified座面最大高度:2.65 mm
子类别:Switching Regulator or Controllers表面贴装:YES
切换器配置:PUSH-PULL最大切换频率:700 kHz
技术:BIPOLAR温度等级:COMMERCIAL
端子面层:Matte Tin (Sn)端子形式:GULL WING
端子节距:1.27 mm端子位置:DUAL
处于峰值回流温度下的最长时间:30宽度:7.5 mm
Base Number Matches:1

LT1681ESW#PBF 数据手册

 浏览型号LT1681ESW#PBF的Datasheet PDF文件第2页浏览型号LT1681ESW#PBF的Datasheet PDF文件第3页浏览型号LT1681ESW#PBF的Datasheet PDF文件第4页浏览型号LT1681ESW#PBF的Datasheet PDF文件第5页浏览型号LT1681ESW#PBF的Datasheet PDF文件第6页浏览型号LT1681ESW#PBF的Datasheet PDF文件第7页 
LT1681  
Dual Transistor  
Synchronous Forward Controller  
U
FEATURES  
DESCRIPTIO  
The LT®1681 controller simplifies the design of high power  
High Voltage: Operation Up to 72V  
Synchronizable Operating Frequency and Output  
Switch Phase for Multiple Controller Systems  
Fixed Frequency Operation to 350kHz  
Adaptive and Adjustable Blanking  
Synchronous Rectifier Driver  
synchronous dual transistor forward DC/DC converters. The  
part employs fixed frequency current mode control and  
supports both isolated and nonisolated topologies. The IC  
drivesexternalN-channelpowerMOSFETsandoperateswith  
input voltages up to 72V.  
Local 1% Voltage Reference  
The LT1681’s operating frequency is programmable and can  
be synchronized up to 350kHz. Switch phase is also con-  
trolled during synchronized operation to accommodate mul-  
tipleconvertersystems. Internallogicguarantees50%maxi-  
mum duty cycle operation to prevent transformer saturation.  
Undervoltage Lockout Protection with Hysteresis  
Input Overvoltage Protection  
Programmable Start Inhibit  
Transformer Primary Saturation Protection  
Optocoupler Feedback Support  
Soft-Start Control  
The LT1681 incorporates a soft-start feature that provides a  
controlled increase in supplied current during start-up and  
after an undervoltage lockout or overvoltage/overcurrent  
event.  
U
APPLICATIO S  
Isolated Telecommunication Systems  
The part is available in a 20-lead wide SO package to support  
high voltage pin-to-pin clearance.  
Personal Computers and Peripherals  
Lead Acid Battery Backup Systems  
Automotive and Heavy Equipment  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
36V-72V DC to 5V/7A Synchronous Forward Converter (Half-Brick Footprint)  
V
= 5V  
= 7A  
OUT  
OUT  
L1  
4.7µH  
L2  
4.1µH  
I
+
+
6
7
5
8
4
V
V
IN  
OUT  
Q1  
MURS120T3  
1
2
3
10Ω  
0.25W  
+
C5  
MBR-  
+
C2  
22µF  
100V  
C4  
1.5µF  
100V  
330µF  
0540T1  
1nF  
100V  
10Ω  
0.25W  
MURS120T3  
Q3  
10V  
10  
11  
12  
1nF  
100V  
Q6  
C3  
1.5µF  
100V  
0.025Ω  
1/2W  
9
4.7Ω  
Q5  
T1  
V
IN  
V
OUT  
C2:SANYO 100MV22AX  
ZVN3310F  
C3, C4: VITRAMON VJ1825Y155MXB  
C5: 4X KEMET T510X337KO10AS  
L1: COILCRAFT DO1608C-472  
L2: PANASONIC ETQP6F4R1LF4  
Q1,Q3:100V SILICONIX SUD40N10-25  
Q5,Q6: SILICONIX Si4450  
BAT54  
1OV  
10k  
2k  
0.22µF  
100Ω  
BIAS  
1OV  
BIAS  
0.1µF  
FZT690  
330pF  
50V  
MMBD914LT1  
BAS21  
100V  
T1:COILTRONICS VP5-1200  
Q10: ON SEMI MMBT3906LTI  
CMPZ5242B  
12V  
73.2k  
1%  
4.7µF  
16V  
270k  
5V  
OUT  
0.25W  
20k  
19  
18  
16 11  
15  
20  
17  
12  
14  
LTC1693-2  
CC1  
3.3Ω  
V
V
BLKSENS TG BSTREF BG SENSE T  
LT1681  
PGND  
6
8
3
1
4
CC  
BST  
MAX  
13  
CMPZ-  
SG  
V
V
CC2  
2
1
CMPZ5248B  
5248B  
0.047µF  
OVLO  
SHDN  
5
7
2
18V  
15V  
9
IN2  
OUT2  
OUT1  
GND1  
V
THERM SYNC SGND SS V  
C
5V  
F
SET  
FB  
REF  
5
1681 TA01  
IN1  
51Ω  
3.01k  
1%  
6
3
7
4
8
10  
100Ω  
0.1µF  
10k  
56k  
52.3k  
GND2  
Q10  
+
1.24k  
1%  
68µF  
1nF 24k  
20V  
4.7nF  
1k  
1%  
1µF  
150pF  
0.01µF  
1681f  
1

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