The UCC28881 integrates the controller and a 14-Ω, 700-V power MOSFET into one monolithic device. The device also integrates a high-voltage current source, enabling start up and operation directly from the rectified mains voltage. UCC28881 is the same family device of UCC28880, with higher current handling capability.
The low quiescent current of the device enables excellent efficiency. With the UCC28881 the most common converter topologies, such as buck, buck-boost and flyback can be built using a minimum number of external components.
The UCC28881 incorporates a soft-start feature for controlled start up of the power stage which minimizes the stress on the power-stage components.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
UCC28881 | SOIC (7) | 5.00 mm × 6.20 mm |
Changes from A Revision (December 2015) to B Revision
Changes from * Revision (November 2015) to A Revision
PRODUCT | MAXIMUM OUTPUT CURRENT for 85 ~ 265 VAC OPEN FRAME DESIGN |
MAXIMUM OUTPUT POWER for 85 ~ 265 VAC OPEN FRAME DESIGN |
---|---|---|
NON-ISOLATED BUCK | FLYBACK | |
UCC28880 | 100 mA | 3 W |
UCC28881 | 225 mA | 4.5 W |
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
DRAIN | 8 | P | Drain pin |
FB | 3 | I | Feedback terminal |
GND | 1 | G | Ground |
GND | 2 | G | Ground |
HVIN | 5 | P | Supply pin |
NC | 6 | N/C | Not internally connected |
VDD | 4 | O | Supply pin, supply is provided by internal LDO |