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参数资料
| 型号： | UC3845BN |
| 厂商： | ON Semiconductor |
| 文件页数： | 1/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 8-DIP |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 275kHz |
| 占空比： | 50% |
| 电源电压： | 7.6 V ~ 30 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 其它名称： | UC3845BNOS |
UC3844B, UC3845B,
UC2844B, UC2845B
High Performance
14
Voltage Feedback V CC
Current Sense Output
NC V C
Current Sense Output
Current Mode Controllers
The UC3844B, UC3845B series are high performance fixed frequency
current mode controllers. They are specifically designed for Off ? Line
and dc ? dc converter applications offering the designer a cost ? effective
solution with minimal external components. These integrated circuits
feature an oscillator, a temperature compensated reference, high gain
error amplifier, current sensing comparator, and a high current totem pole
output ideally suited for driving a power MOSFET.
Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle ? by ? cycle
current limiting, a latch for single pulse metering, and a flip ? flop
which blanks the output off every other oscillator cycle, allowing
output deadtimes to be programmed from 50% to 70%.
These devices are available in an 8 ? pin dual ? in ? line and surface
mount (SOIC ? 8) plastic package as well as the 14 ? pin plastic surface
mount (SOIC ? 14). The SOIC ? 14 package has separate power and
ground pins for the totem pole output stage.
The UCX844B has UVLO thresholds of 16V (on) and 10V (off), ideally
suited for off ? line converters. The UCX845B is tailored for lower voltage
applications having UVLO thresholds of 8.5V (on) and 7.6V (off).
Features
? Trimmed Oscillator for Precise Frequency Control
? Oscillator Frequency Guaranteed at 250 kHz
? Current Mode Operation to 500 kHz Output Switching Frequency
? Output Deadtime Adjustable from 50% to 70%
? Automatic Feed Forward Compensation
? Latching PWM for Cycle ? By ? Cycle Current Limiting
? Internally Trimmed Reference with Undervoltage Lockout
? High Current Totem Pole Output
? Undervoltage Lockout with Hysteresis
? Low Startup and Operating Current
? These Devices are Pb ? Free and are RoHS Compliant
? NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC ? Q100
Qualified and PPAP Capable
http://onsemi.com
PDIP ? 8
N SUFFIX
CASE 626
8
1
SOIC ? 14
D SUFFIX
CASE 751A
1
SOIC ? 8
8 D1 SUFFIX
CASE 751
1
PIN CONNECTIONS
Compensation 1 8 V ref
2 7
3 6
R T /C T 4 5 GN
D
(Top View)
Compensation 1 14 V ref
NC 2 13 NC
Voltage Feedback 3 12 V CC
4 11
5 10
V CC
7(12)
NC
R T /C T
6
7
9
8
GND
Power Ground
V ref
8(14)
R T /C T
R
R
V ref
Undervoltage
Lockout
Oscillator
5.0V
Reference
V CC
Undervoltage
Lockout
V C
7(11)
Output
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
Voltage
Feedback
Input
4(7)
Latching
PWM
6(10)
Power
Ground
5(8)
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 16 of this data sheet.
Output/
2(3)
Error
Amplifier
Current
Sense Input
Compensation
1(1)
5(9)
GND
Pin numbers in parenthesis are for the D suffix SOIC-14 package.
Figure 1. Simplified Block Diagram
3(5)
? Semiconductor Components Industries, LLC, 2013
August, 2013 ? Rev. 11
1
Publication Order Number:
UC3844B/D
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UC3845BNG | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC3845BNST | 制造商:STMicroelectronics 功能描述:IC REG CTRLR PWM CM 8-MINIDIP |
| UC3845BV | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
| UC3845BVD | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC3845BVD1 | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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