TI UCD3138RJAT

The UCD3138 is a digital power controller that offers high integration and excellent performance in a single-chip solution. The flexible features of the UCD3138 make this device suitable for a wide variety of power conversion applications. In addition, the various peripherals within the device have been specifically optimized to enhance the performance of AC/DC and isolated DC/DC applications and reduce the number of solution components in information technology (IT) and network infrastructure spaces. The UCD3138 controller is a fully programmable solution that allows customers to have full control over related applications and stand out among similar solutions. Meanwhile, efforts are made to simplify users' development work by providing first-class development tools, including application firmware, the Code Composer Studio software development environment, and a power development GUI, which enable users to configure and monitor key system parameters.

The core of the UCD3138 controller is the digital control loop peripheral, also known as the Digital Power Peripheral (DPP). Each DPP implements a high-speed digital control loop, which consists of a dedicated error analog-to-digital converter (EADC), a PID-based dual-pole/dual-zero digital compensator, and a DPWM output with a pulse width resolution of 250 ps. This device also includes a 12-bit, 267 ksps general-purpose ADC with up to 15 channels, timers, interrupt control, PMBus, and UART communication ports.

This device is based on a 32-bit ARM7TDMI-S Reduced Instruction Set Computer (RISC) microcontroller, which can perform real-time monitoring, configure peripherals, and manage communications. The ARM microcontroller executes its programs from programmable flash memory as well as on-chip RAM and ROM.

In addition to the FDPP, specific power management peripherals have been added to enable high efficiency, high integration for increased power density, reliability, and the lowest overall system cost across the entire operating range, as well as high flexibility to support the widest number of control architectures and topologies. Such peripherals include: light load burst mode, synchronous rectification, LLC and phase-shifted full-bridge mode switching, input voltage feedforward, copper trace current sensing, ideal diode emulation, constant current/constant power control, synchronous rectification soft start and stop, peak current mode control, flux balancing, secondary-side input voltage sensing, high-resolution current sharing, hardware-configurable soft start with pre-biased voltage, etc.

Topology support has been optimized for voltage mode and peak current mode controlled phase-shifted full bridges, single and dual-phase power factor correction (PFC), bridgeless PFC, hard-switched full and half bridges, and LLC half and full bridges.

• Up to 3 independent feedback loops — PID-based dedicated hardware — dual-pole/dual-zero configuration support — nonlinear control
• Up to 16MHz error ADC (EADC) — configurable resolution down to 1mV/LSB — automatic resolution selection — up to 8× oversampling — hardware-based averaging (up to 8×)
• 14-bit effective DAC — adaptive sample trigger positioning
• Up to 8 high-resolution DPWM outputs — 250ps pulse width resolution — 4ns frequency resolution — 4ns phase resolution — adjustable phase shift between outputs — adjustable dead band between pairs — cycle-by-cycle duty cycle matching — switching frequency up to 2MHz
• Configurable PWM edge movement — trailing edge modulation — leading edge modulation — triangular modulation
• Configurable feedback control — voltage mode — average current mode — peak current mode control — constant current — constant power
• Configurable modulation methods — frequency modulation — phase shift modulation — pulse width modulation
• Fast, automatic, and smooth mode switching — frequency modulation and PWM — phase shift modulation and PWM
• Efficient light-load management — burst mode — ideal diode emulation — synchronous rectifier soft turn-on/off — low IC standby power
• Soft start/stop with and without pre-bias voltage
• Fast input voltage feedforward hardware
• Primary-side voltage sensing
• Copper trace current sensing
• Flux and phase current balancing for non-peak current mode control applications
• Current sharing bus support — analog averaging — master and slave devices
• Rich fault protection options — 7 high-speed analog comparators — cycle-by-cycle current limiting — programmable fault counting — external fault input — 10 digital comparators — programmable blanking time
• DPWM waveform synchronization across multiple UCD3138 series devices
• 14-channel, 12-bit, 267ksps general-purpose ADC with integrated — programmable averaging filter — dual sample-and-hold
• Internal temperature sensor
• Fully programmable high-performance 31.25MHz, 32-bit ARM7TDMI-S processor — 32KB program flash — 2KB data flash with ECC support — 4KB data RAM — 4KB boot ROM enabling field firmware bootloading via I²C or UART
• Communication peripherals — I²C / PMBus — 2× UART on UCD3138RGC (64-pin QFN) — 1× UART on UCD3138RHA/UCD3138RMH (40-pin QFN) and UCD3138RJA (40-pin VQFN)
• Timer capture with selectable input pin
• Up to 5 additional general-purpose timers
• Built-in watchdog: BOD and POR
• 64-pin and 40-pin QFN packages
• Operating temperature: -40°C to 125°C
• Fusion Digital Power Studio GUI support

• Power and telecom rectifiers
• Power factor correction
• Standalone DC-DC modules