UCC28781-Q1 Series

Automotive, high-density, zero-voltage switching (ZVS) flyback controller with integrated SR control

Catalog

Automotive, high-density, zero-voltage switching (ZVS) flyback controller with integrated SR control

Part	Output Isolation	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Package / Case	Frequency - Switching	Supplier Device Package	Voltage - Start Up	Fault Protection	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Control Features	Mounting Type	Grade	Qualification	Internal Switch(s)
Texas Instruments UCC28781ARTWR	Isolated	14 V	34 V	24-WFQFN Exposed Pad	500 kHz	24-WQFN (4x4)	500 mV	Current Limiting Over Power Over Temperature Over Voltage Short Circuit	-40 °C	125 °C	Flyback Secondary Side SR	Soft Start	Surface Mount
Texas Instruments UCC28781QRTWRQ1	Isolated	14 V	34 V	24-WFQFN Exposed Pad	500 kHz	24-WQFN (4x4)	500 mV	Current Limiting Over Power Over Temperature Over Voltage Short Circuit	-40 °C	125 ¯C	Flyback Secondary Side SR	Soft Start	Surface Mount	Automotive	AEC-Q100

Catalog

Automotive, high-density, zero-voltage switching (ZVS) flyback controller with integrated SR control

Key Features

• AEC-Q100 qualified for automotive applications:Temperature grade 1, TA: –40°C to 125°CDevice HBM ESD classification level 2Device CDM ESD classification level C2AFunctional Safety CapableDocumentation available to aid functional safety system designSwitching frequency: > 500 kHzEnables peak efficiency > 93 %Enables < 50 mW stand-by power (basic systems)Adaptive control for zero voltage switching (ZVS) and dead time optimizationEMI frequency dithering without trade-offs on transient response or audible noiseProgrammable adaptive burst mode (ABM) with internal compensationOver-temperature, overvoltage, output short-circuit, overcurrent, over-power, and pin-fault protectionsAuto-recovery fault-response4 mm × 4 mm, 24-pin, QFN packageAEC-Q100 qualified for automotive applications:Temperature grade 1, TA: –40°C to 125°CDevice HBM ESD classification level 2Device CDM ESD classification level C2AFunctional Safety CapableDocumentation available to aid functional safety system designSwitching frequency: > 500 kHzEnables peak efficiency > 93 %Enables < 50 mW stand-by power (basic systems)Adaptive control for zero voltage switching (ZVS) and dead time optimizationEMI frequency dithering without trade-offs on transient response or audible noiseProgrammable adaptive burst mode (ABM) with internal compensationOver-temperature, overvoltage, output short-circuit, overcurrent, over-power, and pin-fault protectionsAuto-recovery fault-response4 mm × 4 mm, 24-pin, QFN package

Description

The UCC28781-Q1 is a zero-voltage-switching (ZVS) controller which can be used at very high switching frequencies to minimize the size of the transformer and enable high power density. With direct synchronous rectifier (SR) control, the controller does not need a separate SR controller, as it can drive the SR FET directly to maximize efficiency and simplify design. (For isolated applications, an isolated gate-driver IC is required.) Using adaptive dead-time control for ZVS, switching losses and EMI are minimized. This design results in a controller with extremely high conversion efficiency across the entire operating range. The programmable adaptive burst mode (ABM) gives flexibility to control when the controller enters and exits standby mode to optimize standby power in light and no-load conditions. ABM also helps to reduce ripple and minimize audible noise. The controller offers multiple protection modes with automatic restart (retry) responses. The UCC28781-Q1 is a zero-voltage-switching (ZVS) controller which can be used at very high switching frequencies to minimize the size of the transformer and enable high power density. With direct synchronous rectifier (SR) control, the controller does not need a separate SR controller, as it can drive the SR FET directly to maximize efficiency and simplify design. (For isolated applications, an isolated gate-driver IC is required.) Using adaptive dead-time control for ZVS, switching losses and EMI are minimized. This design results in a controller with extremely high conversion efficiency across the entire operating range. The programmable adaptive burst mode (ABM) gives flexibility to control when the controller enters and exits standby mode to optimize standby power in light and no-load conditions. ABM also helps to reduce ripple and minimize audible noise. The controller offers multiple protection modes with automatic restart (retry) responses.