TheUC3845BN is of control ICs provi玩數des the necessary featu音鐵res to implement off門愛-line or DC to DC fixed frequency curr跳話ent mode control schemes with a minimal藍銀 external parts count. Internally imple事呢mented circuits include a trimmed 來長oscillator for preci但也se DUTY CYCLE CONTROL under vo去時ltage lockout featuring start-up curre報金nt less than 0.5 A.

A precision reference trimmed fo請亮r accuracy at the error amp input, lo司做gic to insure latched opera在年tion, a PWM comparator which also provi少人des current limit control, and a to短見tem pole output stage d也看esigned to source or sink high 鐘會peak current. The output st場相age, suitable for drivi時些ng N-Channel MOSFETs, is low in t畫窗he offstate.

UC3845BN Features:

• Trimmed Oscillator for 金通Precise frequency Control
• Oscillator Frequency Guaranteed at分白 250 Hz
• Current Mode Operation to 50文看0 kHz
• Automatic Feed Forward Copensati銀他on
• Latching PWM for Cycle-b現鐵y-cycle Current Limiting
• Internally Trimmed Reference wit著鐵h Undervoltage lockout
• High Current totem pole out湖場put Undervoltage Lockout With Hyster間生sis
• Low Start-up and Operating Current