- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381149 > UC2845 (ON SEMICONDUCTOR) High Performance Current Mode Controllers(高性能電流模式控制器) PDF資料下載
參數(shù)資料
| 型號： | UC2845 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Performance Current Mode Controllers(高性能電流模式控制器) |
| 中文描述： | 高性能電流模式控制器（高性能電流模式控制器） |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 354K |
| 代理商： | UC2845 |
Semiconductor Components Industries, LLC, 2005
November, 2005 Rev. 6
1
Publication Order Number:
UC3844/D
UC3844, UC3845, UC2844,
UC2845
High Performance
Current Mode Controllers
The UC3844, UC3845 series are high performance fixed frequency
current mode controllers. They are specifically designed for OffLine
and DCtoDC 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, cyclebycycle
current limiting, a latch for single pulse metering, and a flipflop 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 8pin dualinline plastic package
as well as the 14pin plastic surface mount (SOIC14). The SOIC14
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 offline converters. The UCX845 is tailored for
lower voltage applications having UVLO thresholds of 8.5 V (on) and
7.6 V (off).
Features
Current Mode Operation to 500 kHz Output Switching Frequency
Output Deadtime Adjustable from 50% to 70%
Automatic Feed Forward Compensation
Latching PWM for CycleByCycle 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 Products
PbFree Packages are Available
Figure 1. Simplified Block Diagram
5.0V
Reference
Flip
Flop
&
Latching
PWM
V
CC
Undervoltage
Lockout
Oscillator
Error
Amplifier
7(12)
V
C
7(11)
Output
6(10)
PWR GND
5(8)
3(5)
Current
Sense
V
ref
8(14)
4(7)
2(3)
1(1)
GND
5(9)
R
T
C
T
Voltage
Feedback
R
R
+
V
ref
Undervoltage
Lockout
Output
Comp.
Pin numbers in parenthesis are for the D suffix SOIC14 package.
V
CC
14
SOIC14
D SUFFIX
CASE 751A
1
1
8
PDIP8
N SUFFIX
CASE 626
PIN CONNECTIONS
(Top View)
V
ref
(Top View)
Compensation
Voltage Feedback
Current Sense
R
T
/C
T
V
ref
V
CC
Output
GND
1
2
3
4
5
6
7
8
Compensation
NC
Voltage Feedback
NC
Current Sense
NC
R
T
/C
T
NC
V
CC
V
C
Output
GND
Power Ground
1
2
3
4
5
6
7
9
8
10
11
12
13
14
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page page 14 of this data sheet.
DEVICE MARKING INFORMATION
1
8
SOIC8
D1 SUFFIX
CASE 751A
http://onsemi.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UC3845 | High Performance Current Mode Controllers(高性能電流模式控制器) |
| UC2845AAY | CURRENT MODE PWM CONTROLLER |
| UC284XA | CURRENT MODE PWM CONTROLLER |
| UC2845AL | |
| UC1842AL | Automotive 8-bit MCU, with up to 32 Kbytes Flash, EEPROM, 10-bit ADC, timers, LIN, SPI, I2C, 3 V to 5.5 V |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC2845A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Current Mode PWM Controller |
| UC2845AAY | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:CURRENT MODE PWM CONTROLLER |
| UC2845AD | 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2845AD1 | 功能描述:電流型 PWM 控制器 0.5mA Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2845AD1013TR | 制造商:STMicroelectronics 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。