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參數(shù)資料
| 型號： | UC3845 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Fixed Frequency Current-Mode PWM Controller.(固定頻率電流型PWM控制器(開啟門限電壓：8.5V，關門限電壓：7.9V）) |
| 中文描述： | 固定頻率電流模式PWM控制器。（固定頻率電流型脈寬調制控制器（開啟門限電壓：8.5V，關門限電壓：7.9V）） |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 91K |
| 代理商： | UC3845 |
2000 Fairchild Semiconductor International
www.fairchildsemi.com
Rev. 5.0
Features
Low Start Up Current
Maximum Duty Clamp
UVLO With Hysteresis
Operating Frequency Up To 500KHz
Description
The UC3842/UC3843/UC3844/UC3845 are fixed fre-
quency current-mode PWM controller. They are specially
designed for Off - Line and DC-to-DC converter applica-
tions with minimum external components. These inte-
grated circuits feature a trimmed oscillator for precise duty
cycle control, a temperature compensated reference, high
gain error amplifier. current sensing comparator, and a high
current totempole output Ideally suited for driving a power
MOSFET. Protection circuity Includes built in under-volt-
age lockout and current limiting. TheUC3842 and UC3844
have UVLO thresholds of 16V (on) and 10V (off) The
UC3843 and UC3845 are 8.5V (on) and 7.9V (off) The
UC3842 and UC3843 can operate within 100% duty cycle.
The UC3844and UC3845 can operate with 50% duty cycle.
8-DIP
14-SOP
1
1
Internal Block Diagram
UC3842/UC3843/UC3844/UC3845
SMPS Controller
相關PDF資料 |
PDF描述 |
|---|---|
| UC3844 | Fixed Frequency Current-Mode PWM Controller.(固定頻率電流型PWM控制器(開啟門限電壓：16V，關門限電壓：10V）) |
| UC3846N | SMPS Controller |
| UC3846 | SMPS（Switch-Mode Power Suppy) Controller(開關模式電源控制器) |
| UC3854AJ | Low voltage CMOS quad bus buffers (3-state) with 5 V tolerant inputs |
| UC3854AL | Analog IC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UC3845A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Current Mode PWM Controller |
| UC3845A-BW | 制造商:FCI 制造商全稱:First Components International 功能描述:Current Mode PWM Controller Low Start-Up and Operating Current |
| UC3845AD | 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845AD1 | 功能描述:電流型 PWM 控制器 RO 511-UC3845BD 9/04 RoHS:否 制造商:Texas Instruments 開關頻率: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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845AD1013TR | 制造商:STMicroelectronics 功能描述: |
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