UCC28951-Q1 Controller: Pinout, Datasheet and Application Circuit

UCC28951QPWRQ1 Pinout

Symbol

UCC28951QPWRQ1 Symbol

3D Model

UCC28951QPWRQ1 3D Model

The UCC28951-Q1 controller combines all the functions necessary to control a phase-shifted, full-bridge, power stage in a 24-pin TSSOP package. The controller includes two synchronous-rectifier (SR), gate-drive outputs as well as the outputs needed to drive all four switches in the full-bridge circuit. The dead times between the upper and lower switches in the full-bridge may be set using the DELAB and DELCD inputs. Further, this dead time may be dynamically adjusted according to the load level using the ADEL pin. This adjustment allows the user to optimize the dead time for their particular power circuit and to achieve  ZVS  over the entire operating range. In a similar manner, the dead times between the full-bridge switches and the secondary SRs may be optimized using the DELEF input. This dead time may also be dynamically adjusted according to the load, using the ADELEF input to the controller. A DCM (discontinuous conduction mode) option disables the SRs at a user-settable light load to improve power circuit efficiency. The controller enters a light-load-burst mode if the feedback loop demands conduction more timeless than a user-settable level (TMIN).

• Qualified for automotive applications 

• AEC-Q100 qualified with the following results:

 – Device temperature grade 1: –40°C to +125°Cambient operating temperature range 

– Device HBM ESD classification level H2 

– Device CDM ESD classification level C3B 

• Enhanced zero-voltage switching (ZVS) range 

• Direct synchronous rectifier (SR) control 

• light-load efficiency management including 

– Burst mode operation 

– Discontinuous conduction mode (DCM), dynamic SR on/off control with programmable threshold 

– Programmable adaptive delay 

• Average- or peak-current mode control with programmable slope compensation and voltage mode control 

• Closed-loop soft-start and enable function 

• Programmable switching frequency up to 1 MHzwith bidirectional synchronization 

• (±3%) cycle-by-cycle current limit protection with hiccup mode support 

• 150-µA start-up current 

• VDD under-voltage lockout 

• Wide temperature range: –40°C to +125°C

The following figure shows the functional block diagram of UCC28951QPWRQ1：

UCC28951QPWRQ1 Functional Block Diagram

A typical application for the UCC28951-Q1 is a controller for a phase-shifted full-bridge converter that converts a 390-VDC input to a regulated 12-V output using synchronous rectifiers to achieve high efficiency.

UCC28951QPWRQ1 Typical Application Circuit

UCC28951QPWRQ1 Package

NA UCC28951QPWRQ1 technical specifications, attributes, parameters and parts with similar specifications to NA UCC28951QPWRQ1.