UC2844B

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?High Performance Current Mode PWM Controller

制造商：ON

中文數(shù)據(jù)手冊(cè)

產(chǎn)品信息

The UC3844B, UC3845B 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 deadtimes to be programmed from 50% to 70%.
These devices are available in an 8-pin dual-in-line and surface mount (SO-8) plastic package as well as the 14-pin plastic surface mount (SO-14). The SO-14 package has separate power and ground pins for the totem pole output stage.
The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX845B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).

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
Pb-Free Packages are Available

在線購買

型號(hào)	制造商	描述	購買
UC2844BD1R2G	ON	高性能電流模式控制器	立即購買
UC2844BDR2G	ON		立即購買
UC2844BNG	ON	高性能電流模式控制器	立即購買

技術(shù)資料

標(biāo)題	類型	大?。↘B）	下載
High Performance Current Mode Controller	PDF	393	點(diǎn)擊下載
SOIC-8 Narrow Body	PDF	61	點(diǎn)擊下載
SOIC-14 NB	PDF	33	點(diǎn)擊下載
8 LEAD PDIP	PDF	34	點(diǎn)擊下載

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