• Product Introduction

LT1243IS8

High-speed current-mode pulse-width modulator

peculiarity

• 低启动电流：
• 50ns current sense delay
• Current mode operation: up to 500kHz
• The UC1842 series is pin compatible
• Hysteresis undervoltage locking
• No cross-conduction current
• Trim the gap datum
• 1A totem pole output
• Trim oscillator frequency and sink current
• Output active pulldown during reference and undervoltage lockout
• High level output clamping: 18V
• Current detection cutting-edge blanking

description

® The LT 1241 series devices are 8-pin, fixed-frequency, current-mode, pulse-width modulators. They have improved the plug-in to be compatible with the industry-standard UC1842 series version. These devices feature improved speeds and lower quiescent currents. The LT1241 series is optimized for off-line and DC/DC converter applications. They contain a temperature-compensated reference, a high-gain error amplifier, a current-sense comparator, and a high-current totem pole output stage, making them ideal for driving power MOSFETs. start, which has now been reduced to less than 250 μA. The cross-conducted current spike at the output stage has been eliminated to make 500kHz practical operation. Some new features have been incorporated. Added to the cutting-edge blanking of the current sense comparator. The car decoration has two frequencies of oscillation circuit and absorption current, these parameters are tightly specified. The output stage is clamped to a maximum V of 18V in the open state. Output and reference output are actively pulled down during undervoltage lockout