UCD3138 - Digital Controller for Isolated Power | Texas Instruments
MPN: UCD3138 ✓ Hoạt độngUCD3138 Tóm tắt
A digital power controller is a specialized microcontroller that implements control algorithms in firmware rather than analog circuitry. It combines high-speed analog-to-digital converters (ADCs), digital pulse-width modulators (DPWMs), and a programmable state machine to regulate output voltage and current with high accuracy. In the power management hierarchy, the UCD3138 sits between the power stage (MOSFETs, transformers) and the system supervisor, providing closed-loop regulation and communication with a host processor.
Key features of the UCD3138 include three independent feedback loops with dedicated error ADCs, eight DPWM outputs with 250 ps resolution, and an integrated ARM7TDMI-S processor core running at 31.25 MHz. The device also includes a 12-bit, 2 MSPS ADC for monitoring input/output voltages and currents, as well as PMBus and UART interfaces for telemetry and configuration. These features enable adaptive control, fault management, and efficiency optimization in real time.
Technically, the UCD3138 employs a digital control architecture that replaces analog compensators with firmware-implemented PID or 2-pole/2-zero filters. This allows for advanced features such as feed-forward, nonlinear gain, and cycle-by-cycle current limiting. The device supports multiple communication protocols, including PMBus, which simplifies system integration and remote monitoring. Its flexible DPWM configuration supports interleaved and phase-shifted operation, making it suitable for multi-phase and bridge topologies.
Typical applications include server and telecom power supplies, AC-DC adapters, and isolated DC-DC converters. The UCD3138 is particularly well-suited for high-efficiency, high-density designs where digital control enables precise regulation and fast transient response. For example, in a 1.5 kW LLC resonant converter, the UCD3138 can manage burst mode and light-load efficiency improvements.
When designing with the UCD3138, careful attention must be paid to the analog front-end filtering and DPWM output buffering to minimize noise coupling. The device requires a clean 3.3V supply and proper decoupling on the VDDA and VDD pins. Additionally, firmware development is essential, as the control loop parameters must be tuned for the specific power stage.
Bộ thay thế dễ dàng lắp đặt cho UCD3138 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
UCD3138A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
UCD3138064
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
UCD3138128
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
UCD3138064A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
UCD3138128A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
XDPP1100
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
DSC6000
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
UCD3138 Tỷ lệ tối đa & tính chất điện
| Number of Feedback Loops | 3 |
| Number of DPWM Outputs | 8 |
| DPWM Resolution | 250 ps |
| Processor Core | ARM7TDMI-S |
| Processor Clock Speed | 31.25 MHz |
| ADC Resolution | 12-bit |
| ADC Sample Rate | 2 MSPS |
| Điện áp cung cấp | 3.3 V |
| Hộp | VQFN-40 (6x6 mm) |
| Khoảng nhiệt độ hoạt động | -40C to +125C |
| Communication Interfaces | PMBus, UART |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân UCD3138
| Chân 1 | DPWM1A — Digital PWM output A for channel 1 |
| Chân 2 | DPWM1B — Digital PWM output B for channel 1 |
| Chân 3 | DPWM2A — Digital PWM output A for channel 2 |
| Chân 4 | DPWM2B — Digital PWM output B for channel 2 |
| Chân 5 | DPWM3A — Digital PWM output A for channel 3 |
| Chân 6 | DPWM3B — Digital PWM output B for channel 3 |
| Chân 7 | DPWM4A — Digital PWM output A for channel 4 |
| Chân 8 | DPWM4B — Digital PWM output B for channel 4 |
| Chân 9 | VDD — Digital power supply (3.3V) |
| Chân 10 | GND — Ground |
| Chân 11 | VDDA — Analog power supply (3.3V) |
| Chân 12 | AGND — Analog ground |
| Chân 13 | ADCIN0 — Analog-to-digital converter input 0 |
| Chân 14 | ADCIN1 — Analog-to-digital converter input 1 |
| Chân 15 | ADCIN2 — Analog-to-digital converter input 2 |
| Chân 16 | ADCIN3 — Analog-to-digital converter input 3 |
| Chân 17 | PMBUS_CLK — PMBus clock |
| Chân 18 | PMBUS_DATA — PMBus data |
| Chân 19 | UART_TX — UART transmit |
| Chân 20 | UART_RX — UART receive |
Ứng dụng tiêu biểu
UCD3138 phù hợp cho 6 Áp dụngs: Server Power Supplies, Telecom Rectifiers, AC-DC Adapters, Industrial Power Supplies, EV Charging Stations, Renewable Energy Inverters.
Server Power Supplies
The UCD3138 is ideal for server power supplies due to its three feedback loops and eight DPWM outputs, enabling precise control of LLC or phase-shifted full-bridge topologies. Its 250 ps DPWM resolution ensures high-efficiency operation, and the PMBus interface allows real-time telemetry and control. In a typical 1.5 kW server PSU, the UCD3138 manages the DC-DC stage, providing fast transient response and adaptive voltage scaling. The integrated ADC monitors input/output voltages and currents, enabling fault detection and protection. Compared to analog controllers, the UCD3138 offers flexibility in firmware tuning, allowing optimization for different load conditions and efficiency targets.
Được đề xuất
Telecom Rectifiers
In telecom rectifiers, the UCD3138 provides digital control for AC-DC conversion stages, ensuring high efficiency and reliability. Its three feedback loops allow independent regulation of voltage, current, and power, which is essential for battery charging applications. The device's PMBus interface enables remote monitoring and control, facilitating integration into telecom power management systems. The UCD3138's fast ADC (2 MSPS) ensures accurate sensing of fast transients, while the DPWM outputs can be configured for interleaved operation to reduce ripple. This makes the UCD3138 suitable for high-power rectifiers up to several kilowatts, where precise digital control improves overall system performance.
Được đề xuất
AC-DC Adapters
The UCD3138 is well-suited for AC-DC adapters, particularly for high-density designs where efficiency and size are critical. Its integrated ARM7TDMI-S core allows implementation of advanced control algorithms such as burst mode and light-load efficiency optimization. The 250 ps DPWM resolution enables precise frequency control in resonant converters, reducing switching losses. The device's small VQFN-40 package and low external component count make it ideal for compact adapter designs. Additionally, the UCD3138 supports multiple protection features, including over-voltage, over-current, and over-temperature, ensuring reliable operation in consumer applications.
Được đề xuất
Industrial Power Supplies
For industrial power supplies, the UCD3138 offers robust digital control with wide input voltage ranges and high reliability. Its three feedback loops can be configured for voltage, current, and power regulation, making it suitable for battery chargers and motor drives. The device's UART interface allows easy firmware updates and diagnostics. The UCD3138's operating temperature range of -40C to +125C ensures operation in harsh environments. With its flexible DPWM configuration, the UCD3138 can support various topologies, including full-bridge and push-pull, providing a versatile solution for industrial applications.
Được đề xuất
EV Charging Stations
The UCD3138 is increasingly used in EV charging stations for AC-DC and DC-DC conversion stages. Its high-resolution DPWM outputs (250 ps) enable precise control of LLC converters, achieving high efficiency at various load levels. The PMBus interface allows communication with the charging station controller for power management and fault reporting. The UCD3138's fast ADC ensures accurate current and voltage sensing, critical for safe charging. With support for multiple topologies and firmware flexibility, the UCD3138 can be adapted to different charging standards, making it a key component in modern EV infrastructure.
Được đề xuất
Renewable Energy Inverters
In renewable energy inverters, the UCD3138 provides digital control for DC-AC conversion, enabling maximum power point tracking (MPPT) and grid synchronization. Its three feedback loops can regulate DC bus voltage, output current, and power factor. The device's high-speed ADC (2 MSPS) allows real-time monitoring of grid conditions, while the DPWM outputs can generate high-frequency PWM signals for IGBT or GaN switches. The UCD3138's flexibility in firmware enables implementation of advanced control algorithms for grid stability. Its wide operating temperature range and robust protection features make it suitable for outdoor installations.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho UCD3138 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | UCD3138A | UCD3138064 | UCD3138128 | XDPP1100 |
|---|---|---|---|---|---|
| Package | VQFN-40 (6x6 mm) | VQFN-40 (6x6 mm) | VQFN-40 (6x6 mm) | VQFN-40 (6x6 mm) | VQFN-40 (6x6 mm) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Infineon |
| Number of Feedback Loops | 3 | 3 | 3 | 3 | 3 |
| Number of DPWM Outputs | 8 | 8 | 8 | 8 | 8 |
| DPWM Resolution | 250 ps | 250 ps | 250 ps | 250 ps | 150 ps |
| Processor Core | ARM7TDMI-S | ARM7TDMI-S | ARM7TDMI-S | ARM7TDMI-S | ARM Cortex-M0 |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| ADC Sample Rate | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS | 1 MSPS |
Bảo phân biệt quan trọng
- Higher DPWM resolution (250 ps) compared to XDPP1100 (150 ps) (vsXDPP1100)
- Integrated ARM7TDMI-S core with 31.25 MHz clock (vsDSC6000)
- Three feedback loops with dedicated error ADCs (vsUCD3020)
Ghi chú thiết kế
The UCD3138 requires a clean 3.3V supply for both VDD and VDDA. Use separate low-impedance traces and place 0.1uF and 10uF decoupling capacitors close to each power pin. Avoid sharing the analog and digital ground planes to prevent noise coupling into the ADC inputs.
For optimal performance, group the DPWM outputs and route them with controlled impedance to the gate drivers. Keep the ADC input traces short and shielded to minimize noise. Refer to the TI Practical Design Guideline (SNIU028) for detailed layout recommendations.
Ensure the DPWM outputs are not overloaded; they are designed to drive logic-level signals, not directly drive power MOSFETs. Use appropriate gate drivers. Also, verify the firmware configuration for the specific power topology to avoid incorrect PWM timing.
Thông tin tuân thủ
RoHS compliant per TI product page. Not AEC-Q100 qualified.
