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Overview
| Topology | Buck Converter |
| Input voltage | 5-55 V |
| Output 1 | 1 A |
| IC revision | 2 |
Description
The DIODES AL8862Q is a step-down DC-DC converter designed to drive LEDs with a constant current. The AL8862Q operates with an input supply voltage from 5V to 55V and provides an externally adjustable output current up to 1A. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The AL8862Q switches at frequencies up to 1MHz. This allows for the use of smaller size external components, hence minimizing the PCB size. The AL8862Q integrates the power switch and a high-side output current sensing circuit. The maximum output current of AL8862Q is set via an external resistor connected between the VIN and SET input pins. Dimming is achieved by applying either a DC voltage or a PWM signal at the CTRL input pin. The soft-start time can be adjusted using an external capacitor from the CTRL pin to the ground. An input voltage of 0.3V or lower at CTRL pin will shut down the power switch.
Features
- 2.0V to 60V Wide Input Voltage Range
- Wide Input Voltage Range: 5V to 55V
- Output Current up to 1A
- Internal 55V NDMOS Switch
- Typical 4% Output Current Accuracy
- Single Pin for On/Off and Brightness Control by DC Voltage or
- PWM Signal
- High Efficiency (Up to 97%)
- Fault Status Indication for Abnormal Operation
- LED Short-Circuit Protection
- Inherent Open-Circuit LED Protection
- Current-Sense Resistor Short-Circuit Protection
- Overtemperature Shutdown
- Up to 1MHz Switching Frequency
- SO-8EP Package Available in Green Molding Compound (No Br, Sb)
Typical applications
- Automotive interior LED lamps, Automotive exterior LED lamps
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Z @ 100 MHz(Ω) | Zmax(Ω) | IR(A) | RDC(mΩ) | Type | Version | L(µH) | IRP,40K(A) | ISAT(A) | RDC max.(mΩ) | fres(MHz) | Size | ISAT,10%(A) | ISAT,30%(A) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MPSA EMI Multilayer Power Suppression Bead, 600 Ω, 610 Ω | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSA EMI Multilayer Power Suppression Bead | Impedance @ 100 MHz600 Ω | Maximum Impedance610 Ω | Rated Current2.5 A | DC Resistance50 mΩ | TypeHigh Current | – | – | – | – | – | – | Size1206 | – | – | MountSMT | |||
 | WE-PD SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | – | – | Rated Current2.32 A | – | – | VersionStandard | Inductance4.7 µH | Performance Rated Current3.65 A | Saturation Current4.2 A | DC Resistance60 mΩ | Self Resonant Frequency45 MHz | Size7332 | Saturation Current @ 10%4.2 A | Saturation Current @ 30%5.3 A | MountSMT | ||||
 | WE-LHMI SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | – | – | – | – | – | – | Inductance15 µH | Performance Rated Current7.7 A | – | DC Resistance28 mΩ | Self Resonant Frequency7.5 MHz | Size1365 | Saturation Current @ 10%10.2 A | Saturation Current @ 30%18.5 A | MountSMT |