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| 型号： | LT1738IG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 20-SSOP |
| 标准包装： | 66 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 93.5% |
| 电源电压： | 2.55 V ~ 20 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 是 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
LT1738
Slew Rate Controlled
Ultralow Noise DC/DC Controller
FEATURES
DESCRIPTIO
s
s
s
s
s
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s
s
Greatly Reduced Conducted and Radiated EMI
Low Switching Harmonic Content
Independent Control of Output Switch Voltage and
Current Slew Rates
Greatly Reduced Need for External Filters
Single N-Channel MOSFET Driver
20kHz to 250kHz Oscillator Frequency
Easily Synchronized to External Clock
Regulates Positive and Negative Voltages
Easier Layout Than with Conventional Switchers
The LT ? 1738 is a switching regulator controller designed
to lower conducted and radiated electromagnetic interfer-
ence (EMI). Ultralow noise and EMI are achieved by
controlling the voltage and current slew rates of an exter-
nal N-channel MOSFET switch. Current and voltage slew
rates can be independently set to optimize harmonic
content of the switching waveforms vs efficiency. The
LT1738 can reduce high frequency harmonic power by as
much as 40dB with only minor losses in efficiency.
The LT1738 utilizes a current mode architecture opti-
mized for single switch topologies such as boost, flyback
APPLICATIO S
and Cuk. The IC includes gate drive and all necessary
oscillator, control and protection circuitry. Unique error
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Power Supplies for Noise Sensitive Communication
Equipment
EMI Compliant Offline Power Supplies
Precision Instrumentation Systems
Isolated Supplies for Industrial Automation
Medical Instruments
Data Acquisition Systems
amp circuitry can regulate both positive and negative
voltages. The internal oscillator may be synchronized to
an external clock for more accurate placement of switch-
ing harmonics.
Protection features include gate drive lockout for low V IN ,
soft-start, output current limit, short-circuit current limit-
ing, gate drive overvoltage clamp and input supply
undervoltage lockout.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Ultralow Noise 5V to 12V Converter
12V Output Noise
5V
V IN
100 μ F
+
P3
17
3
22 μ H
MBRD620
4 × 150 μ F
OSCON
+
B
10 μ H
150 μ F
OSCON
OPTIONAL
+
A
12V
1A
(Bandwidth = 100MHz)
1.3nF
14
5
6
V IN
SHDN
V5
SYNC
GCL
CAP
2
5pF
POINT A
ON SCHEMATIC
500 μ V/DIV
400 μ V P-P
7
C T
GATE
1
Si9426
16.9k
8
R T
LT1738
POINT B
ON SCHEMATIC
25k
3.3k
16
R VSL
CS
4
50mV/DIV
25k 3.3k
22nF
0.22 μ F
1.5k
15
12
R CSL
V C
SS
GND
PGND
FB
NFB
20
9
25m ?
21.5k
2.5k
5 μ s/DIV
1738 TA01a
13
11
10
1738 TA01
10nF
1738fa
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1739 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:TRANSISTOR | BJT | NPN | 100V V(BR)CEO | 300MA I(C) | TO-39 |
| LT1739CFE | 功能描述:IC AMP XDSL LINE DRV DUAL20TSSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LT1739CFE#PBF | 功能描述:IC AMP LINE DVR DUAL 20-TSSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LT1739CFE#TR | 功能描述:IC AMP XDSL LINE DRV DUAL20TSSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| LT1739CFE#TRPBF | 功能描述:IC AMP XDSL LINE DRV DUAL20TSSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
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