The LM3405 demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405 constant current buck regulator. The board can accept a full input operating range of 3V to 15V.
This design is based on the LED7707 and implements a high efficiency monolithic boost converter and six controlled current generators (rows) specifically designed to supply LEDs arrays used in the backlight of LCD panels. The device can manage an output voltage up to 36 V (i.e. ten white-LEDs per row).
The MCP1631HV Multi-Chemistry Battery Charger is fully assembled and tested for charging one or two series Li-Ion Batteries, one to five series cell NiMH or NiCd batteries, or driving one to two 1 Watt LEDs. The charge termination for Li-Ion is based upon a percentage of fast charge current, the charge termination for NiMH is based on a negative voltage change versus time or positive temperature …
The LM3501 is a synchronous step-up DC/DC converter designed for white LED applications. The evaluation board is set up to drive 3 standard VF white LEDs from a single Li-Ion battery. A fourth LED pad (D4) is included for testing of up to
4 low VF white LEDs.
This circuit is designed to drive a single InGaN UV LED (Vf = 3.8V) at a forward current of 420 mA with a peak-to-peak ripple current of 80 mA or less. The input is 6V to 42V, with LED current and switching frequency (400 kHz) optimized at Vin = 13.8V.
The ZXLD1360EV2, Figure 1, is an evaluation board for evaluating the ZXLD1360 1000mA LED driver with internal switch. The evaluation board can be used to drive a 1 amp LED, or an external choice of LEDs. The number of external connected LEDs depends on the forward voltage of the LEDs connected. A 6 way connector is provided, to allow an external 0.1 inch connecter to be inserted. The LED fitted o…
Figure 1 shows a typical simple low cost solution with a ZXSC310 driving a 1W LED with a typical forward voltage of 3.4V at 300mA from a dual cell battery. A dual cell supply will have a voltage range of 1.8V to 3V for alkaline type batteries.
The MIC2287 is a small 1.2 MHz constant frequency PWM white LED driver. The MIC2287 is available in either a thin SOT-23 or a 2 mm x 2 mm MLF™ package. High power densities in a very small size are achieved using its internal 34 V/500 mA switch.
The MAX16820 evaluation kit (EV kit) demonstrates a step-down, constant-current, hysteretic controlled switching regulator for driving high-brightness LEDs (HB LEDs) using the MAX16820 controller IC. This EV kit is configured to supply an average output LED current of 1A, and operates from a 5V to 28V supply.
The A6211 is a single IC switching regulator that provides constant-current output to drive high-power LEDs. It integrates a high-side N-channel DMOS switch for DC-to-DC step- down (buck) conversion. The A6211 EVB (evaluation board) accepts input voltage from 6V to 48V to drive a single LED string. LED current can be from several hundred mA up to 3A, selected by jumper combination on the EVB. Swi…