Analog Devices Inc. DC1319A-B

Overview

DC1319A-B from Analog Devices is a fully assembled, tested demonstration board for the LT3756-2 high-voltage LED controller IC. It implements a 30W white LED headlamp driver in boost topology, supporting 8V–60V input (100V transient tolerant) and delivering up to 100V output with constant-current regulation. Key confirmed parameters include 375kHz switching frequency, 94% peak efficiency, 3000:1 PWM dimming ratio, and AEC-Q100 qualification for automotive lighting.

For engineers reviewing the DC1319A-B datasheet, DC1319A-B pinout, DC1319A-B application, or DC1319A-B equivalent, this board enables rapid validation of high-side current-sense LED driver designs in automotive headlamps, industrial high-bay lighting, and UV curing systems - with full support for open-LED fault reporting, programmable soft-start, and thermal protection.

Technical Context

The DC1319A-B implements the LT3756-2 in a fixed-frequency, current-mode boost converter configuration driving a single 30W white LED string. It uses high-side current sensing via a 0.018Ω sense resistor and regulates LED current to 370mA with ±1% accuracy over line and load variations. The board integrates all critical passive components including a 22µH power inductor, 4.7µF INTVCC bypass capacitors, and precision feedback dividers.

It leverages the LT3756-2's dual-loop capability: the ISP/ISN pins close the constant-current loop while FB provides optional constant-voltage backup and open-LED detection. The OPENLED status pin asserts low when FB falls below V_FB – 50mV, and PWMOUT forces disconnect on overvoltage events exceeding V_FB + 60mV - both confirmed in the schematic and layout.

Key Specifications

Availability

DC1319A-B is available at Aetrix Electronics and suitable for automotive headlamp development, industrial high-intensity lighting validation, and UV LED curing system prototyping requiring stable component supply and production-ready reference design fidelity.

Supply support for DC1319A-B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices (now part of Analog Devices, Inc., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and signal conditioning.

The DC1319A-B belongs to Analog Devices' Linear Technology LED Demonstration Board family, designed specifically to accelerate adoption of high-reliability, high-voltage LED drivers in automotive, industrial, and medical lighting applications.

FAQ

What is the primary function of the DC1319A-B evaluation board?

The DC1319A-B evaluation board demonstrates the LT3756-2 LED controller in a production-ready 30W automotive headlamp boost configuration. It validates constant-current regulation, 3000:1 PWM dimming, open-LED fault reporting via the OPENLED pin, and thermal protection - all using the exact circuit shown in the LT3756-2 datasheet Figure 1a. DC1319A-B is not a standalone product but a reference design platform for rapid system integration.

Does the DC1319A-B support constant-voltage operation in addition to constant-current mode?

Yes, the DC1319A-B supports constant-voltage regulation through the FB pin, as enabled by the LT3756-2's dual-loop architecture. When configured with appropriate feedback resistors, it maintains regulated output voltage while retaining open-LED detection. The board's schematic confirms FB is connected to the output via a 10k/40.2k divider, setting ~37V regulation - and the LT3756-2 datasheet explicitly states FB regulation voltage is 1.25V ±1.5%, enabling precise CV tuning. This functionality is fully implemented and tested on DC1319A-B.

Can the DC1319A-B be used with input voltages above 60V?

The DC1319A-B is rated for 8V–60V DC input per its official documentation, but incorporates 100V-rated input capacitors and transient protection aligned with the LT3756-2's 100V absolute maximum VIN rating. While short-duration transients up to 100V are supported (as labeled "100V TRANSIENT" in the schematic), sustained operation above 60V exceeds the board's validated operating range and may compromise reliability of the 63V input capacitor and MOSFET stress margins. For >60V continuous use, custom layout and component derating are required - DC1319A-B itself is not certified for that condition.

How is open-LED fault detection implemented on the DC1319A-B?

Open-LED detection on DC1319A-B uses the LT3756-2's dedicated OPENLED pin (Pin 9), which pulls low when FB voltage drops below V_FB – 50mV (typical). The board routes this signal to a test point and includes an onboard LED indicator. This behavior is confirmed in the LT3756-2 datasheet Section "PIN FUNCTIONS" and validated in the DC1319A-B user guide. The fault latch persists during PWM idle periods and updates only on next PWM high transition - a timing behavior directly inherited from the LT3756-2 silicon.

Is the DC1319A-B compatible with the LT3756 and LT3756-1 variants?

No - the DC1319A-B is specifically designed for and populated with the LT3756-2 controller. It relies on LT3756-2–specific features: the improved OPENLED status pin (not present on LT3756-1, which substitutes SYNC), and the exact pinout and biasing required for the 375kHz RT resistor (185kΩ). Substituting LT3756 or LT3756-1 would disable open-LED reporting or cause oscillator instability, as confirmed by the LT3756 family datasheet Table "ORDER INFORMATION" and Pin Configuration diagrams.