UCC28780

Adaptive Zero Voltage Switching Active-Clamp Flyback Controller

UCC28780 is a high-frequency active-clamp flyback controller that enables high-density AC-to-DC power supplies that comply with stringent global efficiency standards such as DoE Level VI and EU CoC V5 Tier-2. User programmable advanced control law features allow performance to be optimized for both Silicon (Si) and Gallium Nitride (GaN) power FETs. Direct operation with switching devices that combine driver and GaN FETs is further enhanced with logic-level gate signals and enable outputs.

Zero voltage switching (ZVS) is achieved over a wide operating range with advanced auto-tuning techniques, adaptive dead-time optimization, and variable switching frequency control law. Using adaptive multimode control that changes the operation based on input and output conditions, UCC28780 enables high efficiency while mitigating audible noise. With a variable switching frequency of up to 1 MHz and accurate programmable over-power protection, which provides consistent power for thermal design across wide line range, the size of passive components can be further reduced and enable high power density.

UCC28780 works with VDS-sensing synchronous rectifier controllers, such as UCC24612, to achieve higher conversion efficiency and very compact designs.

Full and Partial Zero Voltage Switching (ZVS) of Primary FET with Adaptive Control
Programmable Timing for External Si or GaN FETs
High Switching Frequency up to 1 MHz
Programmable Adaptive Burst Control and Standby Mode for Light-Load Efficiency with Low Output Ripple and Audible Noise Mitigation
Brownout Detection without Direct Line Sensing
Accurate Programmable Over-Power Protection (OPP) to Support Peak Power Mode
Fault Protections: Over-Temperature, Output Over-Voltage, Output Short-Circuit, Over-Current, and Pin Fault
Direct Interface with Optocoupler Based Feedback Allows for Dynamically Scalable Output Voltage
Internal Soft Start
NTC Thermistor Interface with External Enable

All trademarks are the property of their respective owners.

Full and Partial Zero Voltage Switching (ZVS) of Primary FET with Adaptive Control
Programmable Timing for External Si or GaN FETs
High Switching Frequency up to 1 MHz
Programmable Adaptive Burst Control and Standby Mode for Light-Load Efficiency with Low Output Ripple and Audible Noise Mitigation
Brownout Detection without Direct Line Sensing
Accurate Programmable Over-Power Protection (OPP) to Support Peak Power Mode
Fault Protections: Over-Temperature, Output Over-Voltage, Output Short-Circuit, Over-Current, and Pin Fault
Direct Interface with Optocoupler Based Feedback Allows for Dynamically Scalable Output Voltage
Internal Soft Start
NTC Thermistor Interface with External Enable

All trademarks are the property of their respective owners.


Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Features
Operating Temperature Range (C)
Package Group
Rating
Package Size: mm2:W x L (PKG)

UCC28780	LM5023	UCC28600	UCC28610	UCC28704	UCC28740
Current	Current	Current	Current	Current	Current
99	100	99	100	99	99
1000	130	130	130	85	100
17.5/10	12.8/7.5	10.3/9.3	10.2/8	21/7.7	21/7.75
Zero Voltage Switching Active Clamp Flyback	SSR HV Start-up Configurable QR/TM Green Mode Light Load Efficiency Power Delivery Compatible	SSR QR/TM Error Amplifier Green Mode Light Load Efficiency Power Delivery Compatible Motor Drive Compatible Audio Compatible	DCM SSR HV Start-up Soft Switching Power Delivery Compatible Audio Compatible Motor Drive Compatible	PSR HV Start-up Configurable Fixed CBC NTC Configurable CV/CC Control DCM USB Type-C Compatible IoT Compatible Power Delivery Compatible	SSR HV Start-up CV/CC Control DCM Smart Meters Compatible IoT Compatible USB Type-C Compatible Power Delivery Compatible
-40 to 125	-40 to 125	-40 to 105	-40 to 125	-40 to 125	-40 to 125
SOIC WQFN	VSSOP	SOIC	PDIP SOIC	SOT-23	SOIC
Catalog	Catalog	Catalog	Catalog	Catalog	Catalog
16SOIC: 59 mm2: 6 x 9.9(SOIC) 16WQFN: 9 mm2: 3 x 3(WQFN)	8VSSOP: 15 mm2: 4.9 x 3(VSSOP)	8SOIC: 29 mm2: 6 x 4.9(SOIC)	See datasheet (PDIP) 8SOIC: 29 mm2: 6 x 4.9(SOIC)	6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)	7SOIC: 29 mm2: 6 x 4.9(SOIC)