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参数资料
| 型号： | UC2844NG |
| 厂商： | ON Semiconductor |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 8-DIP |
| 产品变化通告： | Product Discontinuation 15/May/2006 |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 60kHz |
| 占空比： | 50% |
| 电源电压： | 10 V ~ 30 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 是 |
| 隔离： | 是 |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 其它名称： | UC2844NGOS |
UC3844, UC3845, UC2844,
UC2845
High Performance
Current Mode Controllers
14
8
The UC3844, UC3845 series are high performance fixed frequency
current mode controllers. They are specifically designed for Off ? Line
and DC ? to ? 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 dead
times to be programmed for 50% to 70%.
These devices are available in an 8 ? pin dual ? in ? line 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 UCX844 has UVLO thresholds of 16 V (on) and 10 V (off),
ideally suited for off ? line converters. The UCX845 is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
http://onsemi.com
PDIP ? 8
N SUFFIX
CASE 626
8
1
SOIC ? 14
D SUFFIX
CASE 751A
1
SOIC ? 8
D1 SUFFIX
CASE 751A
1
PIN CONNECTIONS
Compensation 1 8 V ref
Features
Voltage Feedback 2
7
V CC
GND
?
?
?
?
?
?
?
?
?
?
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
Input Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Direct Interface with ON Semiconductor SENSEFET t Products
Pb ? Free Packages are Available
Current Sense 3
R T /C T 4
Compensation 1
NC 2
Voltage Feedback 3
NC 4
Current Sense 5
(Top View)
6 Output
5
14 V ref
13 NC
12 V CC
11 V C
10 Output
V CC
7(12)
NC
6
9
GND
V ref
8(14)
R
5.0V
Reference
V CC
Undervoltage
Lockout
R T /C T
7
(Top View)
8
Power Ground
R
V ref
Undervoltage
Lockout
V C
7(11)
ORDERING INFORMATION
R T C T
4(7)
Voltage
Feedback
2(3)
1(1)
+
?
Error
Amplifier
Oscillator
Flip
Flop
&
Latching
PWM
Output
6(10)
PWR GND
5(8)
Current
Sense
3(5)
See detailed ordering and shipping information in the package
DEVICE MARKING INFORMATION
See general marking information in the device marking
Output
Comp.
GND 5(9)
Pin numbers in parenthesis are for the D suffix SOIC ? 14 package.
Figure 1. Simplified Block Diagram
? Semiconductor Components Industries, LLC, 2006
July, 2006 ? Rev. 7
1
Publication Order Number:
UC3844/D
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UC2844NG4 | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller 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 |
| UC2844P | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UC2844Q | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Mode SMPS Controller |
| UC2844QTR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Mode SMPS Controller |
| UC2844W | 制造商:未知厂家 制造商全称:未知厂家 功能描述:SMPS Controller |
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