Resonant-Mode Power Supply Controllers

The UC1861-1868 family of ICs is optimized for the control of Zero Current Switched and Zero Voltage Switched quasi-resonant converters. Differences between members of this device family result from the various combinations of UVLO thresholds and output options. Additionally, the one-shot pulse steering Logic is configured to program either on-time for ZCS systems (UC1865-1868), or off-time for ZVS applications (UC1861-1864).
The primary control blocks implemented include an error Amplifier to compensate the overall system loop and to drive a voltage controlled Oscillator (VCO), featuring programmable minimum and maximum frequencies. Triggered by the VCO the one-shot generates pulses of a programmed maximum width, which CAN be modula 193b ted by the Zero Detection Comparator This circuit facilitates "true" zero current or voltage switching over various line, load, and temperature changes, and is also able to accommodate the resonant components' initial tolerances.
Under-Voltage Lockout is incorporated to facilitate safe starts upon power-up. The supply current during the under-voltage lockout period is typically less than 150A, and the outputs are actively forced to the low state.
UVLO thresholds for the UC1861/62/65/66 are 16.5V (ON) and 10.5V (OFF), whereas the UC1863 64/67/68 thresholds are 8V (ON) and 7V (OFF). After VCC exceeds the UVLO threshold, a 5V generator is enabled which provides bias for the internal circuits and up to 10mA for external usage.
A Fault Comparator serves to detect fault conditions and set a latch while forcing the output drivers low. The Soft-Ref pin serves three functions: providing soft start, restart delay, and the internal system reference.
Each device features dual 1 Amp peak totem pole output drivers for direct Interface to Power MOSFETs The outputs are programmed to alternate in the UC1861/63/65/67 devices. The UC1862/64/66/68 outputs operate in unison alllowing a 2 Amp peak current.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
UC2861DW Texas Instruments Resonant-Mode Power Supply Controllers 16-SOIC -40 to 85
UC2861DWG4 Texas Instruments Resonant-Mode Power Supply Controllers 16-SOIC -40 to 85
UC2861N Texas Instruments 1.5A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDIP16
UC2861NG4 Texas Instruments 1.5A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDIP16, GREEN, PLASTIC, DIP-16
UC2861Q Texas Instruments Resonant-Mode Power Supply Controllers 20-PLCC -40 to 85
UC2861 's PackagesUC2861 's pdf datasheet
UC2861DW SOIC
UC2861DWG4 SOIC
UC2861DWTRG4 SOIC
UC2861N PDIP
UC2861NG4 PDIP
UC2861Q PLCC
UC2861QG3 PLCC




UC2861 Pinout, Pinouts
UC2861 pinout,Pin out
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