• Product Introduction

LT1247CS8 

1MHz off-line current mode PWM and DC/DC converter

peculiarity

• Operates in 1MHz current mode
• It has a 30ns current detection delay
• Current detection cutting-edge blanking
• Compatible with the UC1842 pin
• Hysteresis undervoltage locking
• No cross-conduction current
• Trim the gap datum
• 1A totem pole output

description

® LT 1246/LT1247 8-pin, fixed frequency, current mode, pulse width modulator. These devices are designed as plug-in-compatible versions of the industry-standard UC1842 PWM circuit. LT1246 / LT1247 offline and DC/DC converter applications have been optimized. They include a temperature-compensated reference, a high-gain error amplifier, a current detection 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. During the totem pole output stage, the cross-conduction current spike has been eliminated, enabling practical operation at 1MHz. Some new features have been incorporated. Added to the cutting-edge blanking of the current sense comparator. This can minimize or eliminate the filters that are usually needed. Eliminating this filter allows the current feedback loop to operate with minimal delay. 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.