Reference design to ensure dynamic output voltage of printhead power supply

This article describes some important design parameters for managing power in a printer. The reference design shows how to use a MAX15005 power-supply controller as a SEPIC circuit to obtain a high-variable output voltage for a print-head power supply. The circuit schematics , bill of materials (BOM), test measurements, and results are provided.

Display of different LED sequencing using MAXQ2000 microcontroller and MAX6970 LED driver

This note shows an application circuit and provides all the firmware required to interface the MAXQ2000 microcontroller evaluation (EV) kit to the MAX6970, an 8-port, 36V constant-current LED driver. Included in this application note are schematics and microcontroller firmware. The example C program was written and assembled for the MAXQ® microcontroller with the IAR Embedded Workbench®.

Vacuum Tube Fluorescent Display (VFD) Reference Design in Automotive

This article describes a vacuum fluorescent display (VFD) and some ideal applications for the technology. The reference design then shows how to use a MAX15005 power-supply controller in a flyback topology to obtain multiple output voltages for a vacuum fluorescent display.

Avalanche Photodiode (APD) Bias Supply and Current Monitoring

This reference design presents a circuit for addressing the power-supply and current-monitoring requirements of APD biasing applications. Based on the MAX15031 DC-DC converter, the application circuit provides a 70V, 4mA, DC-DC power converter with a 2.7V to 11V input supply-voltage range.

Ultralow Quiescent Current Linear Regulator for Automotive Air Bags

This reference design shows how to increase the output current of the MAX15006/MAX15007 linear regulators to meet the power-supply requirements for an automotive air bag.

A reference design for building an auxiliary power supply for an LCD TV or set-top box using the MAX15026

This application note shows a reference design using the MAX15026 low-cost, high-efficiency synchronous buck converter in an auxiliary power supply for LCD TVs or set-top boxes. This reference design generates a 5V, 5A power supply from a wide, 6.5V to 24V input voltage range.

Use MAX5060 to design a high-current power supply with lossless current detection

This reference design shows how to use a MAX5060 current-mode, step-down power-supply controller to implement lossless current sensing for high-current applications. In this design, the series resistance (DCR) of the inductor is used for current sensing to avoid power loss in the current-sense resistor.

3S3P Automotive Tail Light (RCL) LED Driver Reference Design

This application note presents a reference design for a rear combination lamp (RCL) LED driver in a 3-series, 3-parallel (3S3P) configuration. Using the MAX16823 linear driver and external BJTs, this design provides 200mA per string as well as enhanced heat dissipation. Also included is PWM dimming circuitry for tail-light inputs and full brightness for brake-light inputs. Double-battery and load-dump conditions have been taken into consideration.

Laptop VGA signal switching reference design

This application shows how the MAX4885E low-capacitance VGA switch can be used to perform the switching function in a laptop computer. The MAX4885E draws nearly zero current, fits into a 4mm x 4mm package, and incorporates most of the switches and active components used in a discrete implementation. All device outputs are protected to ±15kV Human Body Model (HBM) so that the designer can eliminate many ESD components, thereby reducing cost and saving board space. An application circuit shows the MAX4885E used for VGA signal switching between a laptop and docking station.

Offline LED Driver Reference Design

This application note presents a reference design for a nonisolated LED driver intended to operate directly from a 400V _DC input. The design drives a string of 27 WLEDs (white LEDs) or, optionally, 6 amber LEDs at 400mA. The topology is a discontinuous flyback with a transformer. The MAX16801 HB (high brightness) LED controller is featured.

5S2P AR111 LED light driver reference design

This application note presents a reference design for an AR111 lamp LED driver with two parallel strings of five LEDs (5S2P). Using the MAX16819 in buck-boost mode, the circuit operates from 12VAC and delivers an average current of 500mA per string.

LED backlight SEPIC driver

This is a reference design for a SEPIC/linear LED-display backlight driver for eight parallel strings of 8 WLEDs (white LEDs) at 70mA/string. The dimming ratio is 4000:1. The input voltage is 16V to 36V with 50V transients. The design combines a SEPIC switching power supply with adaptive feedback and linear current sinks for high dimming ratios. The MAX16809 16-channel LED driver is featured.

Portable Projector 6A RGB LED Driver Reference Design

This reference design for a 6A step-down LED driver is based on the MAX16821 device. This circuit drives a single LED. This design includes the circuit specifications, circuit schematic, and circuit description and performance.

LED signal light driver reference design

This application note presents a reference design for a signal-lamp linear LED driver that consists of six strings of 4 LEDs per string and delivers 350mA per string with a common cathode configuration. Common cathode arrangements require that the current-sense resistors be placed on the high (anode) side, which forces the LED drivers to use a level shifter.

LED backlight BOOST driver

This is a reference design for an LED display-backlight driver. The design uses a boost power supply with adaptive feedback for efficiency and linear current sinks for a high dimming ratio (2000:1). The input voltage is 8V to 18V with 50V transients, and the load is three parallel strings of 8 LEDs (34V) at 150mA/string. The MAX16809 16-channel LED driver is featured.

Designing a buck-boost LED driver using the MAX16834

This reference design is for a buck-boost LED driver. The MAX16834 current-mode high-brightness LED driver is featured, and the MAX16834 EV (evaluation) kit is used to implement the design. The application note shows the design specifications, schematic, bill of materials (BOM), and performance data.

PC-Based Oscilloscope Reference Design

This article presents a reference design for a PC-based oscilloscope. The MAX1393 ADC and MAX1396 EV (evaluation) kit are featured. Schematics, software, and explanation of software functions are all provided.

PC-based temperature measurement system reference design

This application note is a reference design for a PC-based temperature measurement system. It uses the MAX1396 and MAX6603EVKITs, a MAXQ2000 microcontroller, and MAX6603 signal conditioner. The design presents an easy way to obtain the temperature readings from the MAX6603 without requiring complicated conversion formulas. Schematics, block diagrams, and software are all provided.

High-input-voltage, high-current output buck controller reference design using the MAX15046

This reference design presents a circuit for using the MAX15046 step-down power-supply controller for high-input-voltage, low-output-voltage applications that require high output current.

1-Wire Bidirectional Level Translator (1.8V to 5V) Reference Design

Designers need open-drain logic to run at 1.8V at the 1-Wire master IO. Most 1-Wire slave devices cannot run at 1.8V. This application note presents an RD (reference design) of a circuit that translates from a 1.8V 1-Wire master to a 5V 1-Wire slave device. The RD is used for driving typical 1-Wire slave devices. The MAX3394E voltage-level translator is featured in the design.