98ASB42565B中文資料安森美半導(dǎo)體數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

The NCV3843BV is a high performance fixed frequency current

mode controller. They are specifically designed for Off?Line and

DC?DC converter applications offering the designer a cost?effective

solution with minimal external components. These integrated 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 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, programmable output deadtime, and a latch for single

pulse metering.

These devices are available in a surface mount (SOIC?8) plastic

package as well as the 14?pin plastic surface mount (SOIC?14). The

SOIC?14 package has separate power and ground pins for the totem

pole output stage.

The NCV3843BV is tailored for lower voltage applications having

UVLO thresholds of 8.5 V (on) and 7.6 V (off).

Features

? Trimmed Oscillator for Precise Frequency Control

? Oscillator Frequency Guaranteed at 250 kHz

? Current Mode Operation to 500 kHz

? 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

? These are Pb?Free Devices