Evaluates: MAX16815/MAX16828 19-4394 Rev 0 12/08 MAX16828 Evaluation Kit General Description Features The MAX16828 evaluation kit (EV kit) is a fully assem- 6.5V to 40V Input Supply Voltage Range bled and tested PCB that demonstrates a current- 100mA/200mA Output Current controlled, high-output-current LED driver with accurate current control based on the MAX16828 current regula- Wide-Range Dimming Control with PWM tor. The EV kit features pulse-width modulation (PWM) 5V Regulated Output with 4mA Source Capability dimming control and is configured for preset output currents of 100mA or 200mA. The EV kit can operate Lead(Pb)-Free and RoHS Compliant from a single power supply at voltages between 6.5V Fully Assembled and Tested and 40V. The MAX16828 EV kit also evaluates the MAX16815 IC contact the factory for a free sample of the MAX16815 IC. Warning: Under severe fault or failure conditions, this Ordering Information EV kit may dissipate large amounts of power. Operate this EV kit with care to avoid possible personal injury. PART TYPE MAX16828EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 200m A adj ustabl e hig h-b r i g htness 0.1F 10%, 50V X7R ceramic LED driver (6 TDFN-EP*) U1 1 capacitors (0603) C1, C2 2 Maxim MAX16828ATT+ Murata GRM188R71H104K TDK C1608X7R1H104K V5 1 Test point JU1 1 2-pin header 1 Shunt 1 PCB: MAX16828 Evaluation Kit+ R1 1 100k 5% resistor (0603) 1, 1/4W 1% resistors (0805) *EP = Exposed pad. R2, R3 2 Susumu RL12205-1R0-F Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Susumu International USA 208-328-0307 www.susumu-usa.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX16828 when contacting these component suppliers. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX16828 Evaluation Kit Setting the Output Current Quick Start The output current can be adjusted by replacing resis- Recommended Equipment tors R2 or R3 with values calculated using the following Before beginning, the following equipment is needed: equation: 0 to 30V or above, 0.5A DC power supply V RSENSE R = SENSE Procedure I LED The MAX16828 EV kit is fully assembled and tested. Follow the steps below to verify board operation. where R is the external current-sense resistance SENSE Caution: Do not turn on the power supply until all between CS+ and GND, I is the desired output cur- LED connections are completed. rent, and V is 200mV (typ). RSENSE 1) Connect a 0 to 30V or above, 0.5A DC power PWM Dimming supply to VIN. The PWM dimming controls the LED brightness by 2) Verify that a shunt is installed on JU1. adjusting the duty cycle of the PWM input signal con- 3) Turn on the power supply and increase the input nected to the DIM input. A high at the DIM input turns voltage to above 6.5V. Measure the LED current on the output current and a low turns off the output cur- between the LED+ and LED- pads to show 200mA rent. Connect a signal with peak amplitude between 5V 3.5%. and 40V, and with frequency between 100Hz to 2kHz and vary the duty cycle to adjust the LED brightness. 4) Measure voltage across test point V5 to show 5V LED brightness increases when duty cycle increases 4%. and vice versa. Duty cycle can be as low as 10%, even Detailed Description of Hardware at a PWM frequency of 2kHz. The MAX16828 EV kit demonstrates a current-con- 5V Regulated Output trolled, high-output-current LED driver with accurate The 5V regulator can be used to power other compo- current control based on the MAX16828 current regula- nents from the V5 test point. The 5V output can supply tor. This EV kit is configured for supplying regulated up to 4mA of current and is not disabled during PWM off. output currents of 100mA to 200mA. The EV kit can operate from a single power supply at voltages between 6.5V and 40V. The EV kit also features pulse-width modulation (PWM) dimming control and provides a test point (V5) for con- venient access to the 5V regulated output. Output Current (LED+, LED- ) The output current for the standard output (between LED+ and LED- pads) can be set at either 100mA or 200mA by installing or removing jumper JU1. See Table 1 for jumper settings. By default, the output cur- rent is 200mA. Table 1. Jumper JU1 Functions STANDARD OUTPUT CURRENT SHUNT R SENSE (I AT LED+ AND LED- PADS) LED POSITION () (mA) Installed* 1 200 Not installed 2 100 *Default position. 2 Evaluates: MAX16815/MAX16828