UC1856-SP Texas instruments

UC1856-SP

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UC1856-SP

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Описание

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. A low-impedance TTL-compatible sync output has been implemented with a TRI-STATE function when used as a sync input. Internal-chip grounding has been improved to minimize internal noise caused when driving large capacitive loads. This improvement, in conjunction with the improved differential current-sense amplifier, results in enhanced noise immunity. Other features include a trimmed oscillator current (8%) for accurate frequency and dead-time control; a 1-V 5% shutdown threshold; and 4-kV minimum electrostatic discharge (ESD) protection on all pins.

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 Common-Mode Range
Trimmed-Oscillator Discharge Current for Accurate
Deadband Control
Accurate 1-V Shutdown Threshold
High-Current Dual Totem-Pole Outputs (1.5-A peak)
TTL Compatible Oscillator SYNC Pin Thresholds
4-kV ESD Protection