AL8843
Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.
What the AL8843 family does
The AL8843 is a hysteresis mode DC-DC step-down converter designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. It operates from an input supply between 4.5V and 40V and provides an externally adjustable output current up to 3A, delivering up to 60W of output power depending on supply voltage and external components. This device integrates the power switch and a high-side output current sensing circuit, allowing for dimming via an external control signal on the CTRL pin. Typical applications include LED retrofit for low voltage halogen, low voltage industrial lighting, LED backlighting, and illuminated signs. Key features include a wide input voltage range, internal 40V NDMOS switch, typical 4% output current accuracy, and high efficiency up to 97%. The AL8843 also offers soft-start, LED short and open-circuit protection, and over temperature protection.
AL8843 datasheet parameters
| Parameter | Min | Typ | Max | Conditions | Source |
|---|---|---|---|---|---|
| quiescent current | — | 350 µA | — | CTRL Pin Floating, VIN = 16V; iq; SUPPLY VOLTAGE | Diodes datasheet, p. 4 — ESD Ratings |
| output voltage | — | 40 V | — | VIN maximum in Recommended Operating Conditions (output voltage range of this LED driver converter) | Diodes datasheet, p. 4 — Recommended Operating Conditions |
| output current | — | — | 3 A | iout; Recommended Operating Conditions | Diodes datasheet, p. 4 — Recommended Operating Conditions |
| supply voltage range | 4.5 V | — | 40 V | vin; Recommended Operating Conditions | Diodes datasheet, p. 4 — Recommended Operating Conditions |
| switching frequency | — | 250 kHz | — | VIN = 16V, VO = 9.6V (3 LEDs)L = 47µH, ΔI = 0.25A(ILED = 1A); fsw; SWITCHING OPERATION | Diodes datasheet, p. 4 — ESD Ratings |
| rds on | — | 200 mOhm | — | @ISW = 100mA; ron; SWITCHING OPERATION | Diodes datasheet, p. 4 — ESD Ratings |
| operating temperature | -40 °C | — | 105 °C | ta; Recommended Operating Conditions | Diodes datasheet, p. 4 — Recommended Operating Conditions |
| propagation delay | — | 100 ns | — | —; tpd(note 6); SWITCHING OPERATION | Diodes datasheet, p. 4 — ESD Ratings |
| output count | — | 1 | — | Single-channel LED driver (drives single or multiple series connected LEDs on one output) | Diodes datasheet, p. 1 |