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参数资料
| 型号： | 750108 |
| 厂商： | Wurth Electronics Inc |
| 文件页数： | 1/30页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR LT3748 |
| 设计资源： | LT3748 Design Schematic/Tips |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 功率 - 输出： | 30W |
| 输出电压： | 12V |
| 电流 - 输出： | 2.5A |
| 输入电压： | 22 ~ 75 V |
| 稳压器拓扑结构： | 回扫 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LT3748 |
| 相关产品： | LT3748HMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748HMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748IMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748IMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748EMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748EMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP |
| 其它名称： | 732-3308 |
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LT3748
100V Isolated
Flyback Controller
FEATURES
DESCRIPTION
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5V to 100V Input Voltage Range
1.9A Average Gate Drive Source and Sink Current
Boundary Mode Operation
No Transformer Third Winding or Opto-Isolator
Required for Regulation
Primary-Side Winding Feedback Load Regulation
V OUT Set with Two External Resistors
INTV CC Pin for Control of Gate Driver Voltage
Programmable Soft Start
Programmable Undervoltage Lockout
Available in MSOP Package
The LT ? 3748 is a switching regulator controller specifically
designed for the isolated flyback topology and capable of
high power. It drives a low side external N-channel power
MOSFET from an internally regulated 7V supply. No third
winding or opto-isolator is required for regulation as the
part senses the isolated output voltage directly from the
primary-side flyback waveform.
The LT3748 utilizes boundary mode to provide a small
magnetic solution without compromising load regulation.
Operating frequency is set by load current and transformer
magnetizing inductance. The gate drive of the LT3748
Isolated Telecom Converters
High Power Automotive Supplies
Isolated Industrial Power Supplies
APPLICATIONS
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combined with a suitable external MOSFET allow it to
deliver load power up to several tens of watts from input
voltages as high as 100V.
The LT3748 is available in a high voltage 16-lead MSOP
package with four leads removed.
L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5438499 and 7471522.
TYPICAL APPLICATION
25W, 12V Output, Isolated Telecom Supply
Output Load and Line Regulation
V IN
36V TO 72V
10 μ F
412k
15.4k
EN/UVLO
V IN
R FB
60.8 μ H
243k
4:1
3.8 μ H
V OUT+
12V
2A
100 μ F
V OUT–
12.6
14.4
12.2
LT3748
R REF
6.04k
12.0
11.8
TC
GATE
SS
SENSE
11.6
V IN = 72V
V IN = 48V
V C
GND
INTV CC
0.033Ω
11.4
V IN = 36V
56.2k
2nF
10k
4700pF
4.7 μ F
3748 TA01a
0
0.5
1.0 1.5
LOAD CURRENT (A)
2.0
3748 TA01b
3748fa
1
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