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Documents UC1856-SP
SLUSBV6 – APRIL 2014 UC1856-SP Improved Current-Mode PWM Controller
1 Features 3 Description The UC1856 is a high-performance version of the
popular UC1846 series of current-mode controllers,
and is intended for both design upgrades and new
applications where speed and accuracy are
important. All input-to-output delays have been
minimized, and the current sense output is slew-rate
limited to reduce noise sensitivity. Fast 1.5-A peak
output stages have been added to allow rapid
switching of power FETs. 1 Pin-for-Pin Compatible With the UC1846
65-ns Typical Delay From Shutdown to Outputs,
and 50-ns Typical Delay From SYNC to Outputs
Improved Current-Sense Amplifier With Reduced
Noise Sensitivity
Differential Current Sense with 3-V CommonMode Range
Trimmed-Oscillator Discharge Current for
Accurate Deadband Control …
