Microchip

MCP1664
Demoboard ADM00641

MCP1664 LED DRIVER EVALUATION BOARD

Topologie: Boost
Eingangsspannung (min.): 2.40 V
Eingangsspannung (max.): 5.50 V
Ausgang 1: 2.30 V / 0.270 A

Erstveröffentlichung am 23.07.2015, Version DS50002363A vom

Beschreibung

The MCP1664 is a compact, battery-operated, fixed-frequency, step-up DC-DC converter optimized as LED constant current generator. This product provides an easy-to-use power supply solution with a minimum number of external components for applications powered by two-cell or three-cell alkaline, NiCd or NiMH batteries, one-cellLi-Ion or Li-Polymer batteries.The MCP1664 is a PWM-only device that operates at a fixed 500 kHz switching frequency. The device has an operating input voltage range from 2.4V to 5.5V (with an undervoltage of 2.3V to start and 1.85V to stop). The reference voltage is only 300 mV in order to minimize the losses on the sense resistor and to increase the overall efficiency of the application.The LED can be turned on and off with a variable duty cycle applied to the EN pin for applications that require current dimming. Compared to its counterpart, the MCP1663 which is designed to be a voltage source, the start-up time for the MCP1664 has been decreased in order to obtain better performance in dimming applications.The MCP1664 can supply up to 200 mA of current for a string of four LEDs (considering a LED Forward Voltage of 3V) from a 3V or higher input voltage source.More detailed information regarding the current capabilities of the MCP1664 are available in the data sheet.

Merkmale

  • The MCP1664 LED Driver Evaluation Board has the following features:• Input voltage range, VIN: 2.4V to 5.5V, with VIN VOUT• Undervoltage lockout: 2.3V to start; 1.85V to stop• Adjustable output current: 90 mA, 180 mA or 270 mA, selected using a mini dipswitch on board• PWM Switching frequency = 500 kHz• Variable resistor and triangular wave generator on the board that can be used forPWM dimming• 1.8A peak current limit• Overtemperature protection (if the die temperature exceeds +150°C, 25°C hysteresis)• Open load protection: if the LED string fails or is disconnected, the converter willshut down to prevent failure.

Artikel

  Artikel Nr. SPEC Produktserie Poles VPE L
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(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Version Muster
418121270802 PDF WS-DISV Small Compact SMT with Raised Actuator 2.54 mm 2 800
7447779004 PDF WE-PD SMT-Speicherdrossel 4.7 3.16 4.4 28 32 37 Robust