Diodes Incorporated AL9910A-5SP-13

Overview

AL9910A-5SP-13 from Diodes Incorporated is a high-voltage PWM LED driver-controller designed for offline constant-current LED lighting systems operating directly from rectified AC mains (85–277VAC). It drives external MOSFETs up to 300kHz, delivers 10V gate drive, features 255mV typical current-sense threshold with ±5% tolerance, and supports both linear (LD pin) and PWM (PWM_D pin) dimming. Used in high-brightness LED lamps requiring robust transient immunity (500V max input).

For engineers reviewing the AL9910A-5SP-13 datasheet, AL9910A-5SP-13 pinout, AL9910A-5SP-13 application, or AL9910A-5SP-13 equivalent, key selection criteria include its SO-8EP thermally enhanced package, 10V VDD regulation, 255mV CS threshold accuracy, 200kΩ internal PWM_D pulldown, and compatibility with buck topology LED drivers across universal AC input ranges.

Technical Context

The AL9910A-5SP-13 implements a peak-current-mode controlled buck LED driver architecture with integrated high-voltage LDO (10V regulated output), undervoltage lockout (9–10V hysteresis), and thermal shutdown at +150°C. Its oscillator frequency is resistor-programmable (20–300kHz) via ROSC-to-GND, and it supports constant-off-time (PFM) mode by connecting ROSC to the external MOSFET gate.

It operates with 255mV nominal current-sense threshold (±5% over temperature), 10V gate drive capability, and 1mA VDD supply current budget for auxiliary circuitry. The device uses internal blanking (160–440ns) and delay timing (≤300ns) to ensure stable current regulation during switching transitions.

Key Specifications

Pinout & Package

AL9910A-5SP-13 is housed in the thermally enhanced SO-8EP package (exposed pad), offering 66°C/W junction-to-ambient thermal resistance - significantly lower than standard SO-8 (110°C/W) - enabling higher ambient operation (+105°C) and improved power handling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage LED driver-controller applications.

Compared with AL9910A-5SP-13, the AL9910A-5S-13 sacrifices thermal performance for footprint compatibility, while the AL9910-5SP-13 trades gate drive strength and current-sense precision for legacy design continuity - making the -5SP-13 optimal for new high-reliability, high-ambient LED lamp designs.

Availability

AL9910A-5SP-13 is available at Aetrix Electronics and suitable for LED offline lamps, high-voltage DC-DC LED drivers, and signage lighting requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for AL9910A-5SP-13 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with emphasis on power management, signal integrity, and lighting control ICs.

The AL9910/A family belongs to Diodes' high-voltage LED driver product line, engineered specifically for cost-effective, efficient, and thermally robust offline LED lighting - targeting commercial, industrial, and architectural applications demanding universal AC input operation.

FAQ

What is the maximum allowable ambient temperature for AL9910A-5SP-13 in continuous operation?

The AL9910A-5SP-13 supports continuous operation up to +105°C ambient temperature when mounted on a PCB with the recommended SO-8EP thermal layout (51mm × 51mm, 2oz copper, thermal vias to ground plane). This rating is enabled by its 66°C/W junction-to-ambient thermal resistance - 40% lower than the standard SO-8 variant - and is validated per Diodes' DS35103 Rev. 11-2 specifications.

Can AL9910A-5SP-13 operate in constant-off-time (PFM) mode, and how is it configured?

Yes, AL9910A-5SP-13 supports constant-off-time operation by connecting the ROSC pin to the gate of the external MOSFET instead of ground. This reconfigures the oscillator period to define t_OFF, enabling variable-frequency operation that improves light-load efficiency and eliminates sub-harmonic oscillation in buck topologies. The off-time is calculated from nominal input/output voltages and desired frequency.

How does the LD pin interact with the current-sense threshold, and what is its effective voltage range?

The LD pin linearly scales the internal current-sense comparator threshold from 45mV to 250mV. Applying 45mV yields ~18% of full-scale LED current; 250mV restores nominal 255mV threshold. Voltages above 250mV have no effect. This analog interface enables smooth dimming and soft-start (via RC network) without altering switching behavior or gate timing.

Is an external startup resistor required for AL9910A-5SP-13, and why or why not?

No external startup resistor is required. The AL9910A-5SP-13 integrates a high-voltage LDO that draws only ~0.65mA from VIN to generate its 10V VDD rail. This eliminates power loss, heat generation, and reliability concerns associated with high-wattage startup resistors - a key differentiator versus older LED driver controllers requiring 1–2W startup networks.