Description:

The UCD3138 is a digital power supply controller that offers high integration and excellent performance in a single-chip solution. Its flexible features make this device suitable for a wide variety of power conversion applications. In addition, the multiple peripherals within the device have been specifically optimized to enhance performance in AC/DC and isolated DC/DC applications and to reduce the number of solution components in information technology (IT) and network infrastructure spaces. The UCD3138 controller is a fully programmable solution that gives customers complete control over their applications and enables them to differentiate their solutions from similar offerings. At the same time, Texas Instruments (TI) is committed to simplifying development efforts by providing industry-leading development tools, including application firmware, the Code Composer Studio™ software development environment, and the TI Power Development GUI, which allows users to configure and monitor critical system parameters.

At the heart of the UCD3138 controller are the digital control loop peripherals, also known as Digital Power Peripherals (DPP). Each DPP implements a high-speed digital control loop consisting 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 250ps. The device also includes a 12-bit, 267ksps general-purpose ADC with up to 15 channels, timers, interrupt control, and PMBus and UART communication ports. The device is based on a 32-bit ARM7TDMI-S RISC microcontroller, which executes real-time monitoring, configures peripherals, and manages communications. The ARM microcontroller executes its programs from programmable flash memory as well as on-chip RAM and ROM.

In addition to the DPPs, specific power management peripherals have been added to enable high efficiency across the full operating range, high integration for increased power density, reliability, and the lowest overall system cost, as well as high flexibility to support the widest range of control schemes and topologies. Such peripherals include: light-load burst mode, synchronous rectification, LLC and phase-shifted full-bridge mode switching, input voltage feed-forward, copper trace current sensing, ideal diode emulation, constant current/constant power control, synchronous rectifier soft turn-on and turn-off, peak current mode control, flux balancing, secondary-side input voltage sensing, high-resolution current sharing, hardware-configurable soft-start with pre-bias voltage, and more. Topology support has been optimized for voltage-mode and peak-current-mode controlled phase-shifted full bridge, single- and dual-phase Power Factor Correction (PFC), bridgeless PFC, hard-switched full bridge and half bridge, as well as LLC half bridge and full bridge.

Features:

• Digital control of up to 3 independent feedback loops

– Dedicated PID-based hardware

– Supports dual-pole/dual-zero configuration

– Non-linear control

• Up to 16MHz Error ADC (EADC)

– Configurable resolution down to 1mV/LSB

– Automatic resolution selection

– Up to 8x oversampling

– Hardware-based averaging (up to 8x)

– 14-bit effective DAC

– Adaptive sampling trigger positioning

• Up to 8 high-resolution Digital PWM (DPWM) outputs

– 250ps pulse width resolution

– 4ns frequency resolution

– 4ns phase resolution

– Adjustable phase shift between outputs

– Adjustable dead time 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

• High efficiency and 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 feed-forward hardware

• Primary-side voltage sensing

• Copper trace current sensing

• Flux and phase current balancing for non-peak current mode control applications

• Current share bus support

– Analog average

– Master and slave

• Rich fault protection options

– 7 high-speed analog comparators

– Cycle-by-cycle current limiting

– Programmable fault counting

– External fault inputs

– 10 digital comparators

– Programmable blanking time

• Synchronization of DPWM waveforms among multiple UCD3138 family 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 memory

– 2KB data flash with ECC support

– 4KB data RAM

– 4KB boot ROM enabling in-system firmware boot loading via I2C or UART

• Communication peripherals

– I2C / PMBus

– 2 UARTs on UCD3138RGC (64-pin QFN)

– 1 UART on UCD3138RHA/UCD3138RMH (40-pin QFN) and UCD3138RJA (40-pin VQFN)

• Timer capture with selectable input pins

• 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

• Supported by Fusion Digital Power Studio GUI

Applications:

• Power supplies and telecom rectifiers

• Power factor correction

• Standalone DC-DC modules