UC2844

The UC284x and UC384x are fixed frequency current mode PWM controller.They are specially designed for OFF Line and DC to DC converter applications with a minimal external components.Internally implemented circuits include a trimmed oscillator for precise duty cycle control,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.Protection circuitry includes built under voltage lockout and current limiting. 

The UC2842144,UC3842144 have UVLO thresholds of 16 V (on)and 10 V(off). 

The corresponding thresholds for the UC2843145,UC3843/45 are 8.4V (on) and 7.6V(off). 

The UC2842/43,UC3842143 can operate within 100%duty cycle. 

The UC2844/45,UC3844/45 can operate within 50%duty cycle. 

The UC2842/43/44/45 is characterized for operation from TA=40℃ to 85℃ . 

The UC3842/43/44/45 is characterized for operation from TA=0℃ to 70℃ . 

FEATURES 

Low Start-Up and Operating Current 

High Current Totem Pole Output 

Under voltage Lockout With Hysteresis 

Operating Frequency Up To 500KHz

UC2844脉冲宽度调制解调器参数列表：

品牌:

bw必威西汉姆联

工作电压（Vcc）(v):

30V

频率Freq (Hz):

500khz

功耗 PD(Typ):

1W

工作温度 Operation Temperature Range(℃):

0-70°C

封装:

DIP-8 SOP-8

替代:

UC2844 UC3844 UC3844B

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