DEMO MANUAL DC381A QUICK START GUIDE DC381A is used to evaluate the LTC3201 low noise charge pump LED driver. Before turning on the power supply, connect a 3.3V, 500mA bench power supply to the VIN terminal. Connect ground from the power supply to the GND terminal. Disconnect jumpers from D0,D1,D2. This sets the DAC output to maximum LED current. D0,D1,D2 pull high to VIN. Connecting all 3 jumpers puts the part into shutdown mode. Note that the 300K pull-up resistors connected to D0,D1,D2 will draw some current. Turn on bench power supply. LEDs should light up. Voltage at FB terminal should measure about 0.62V. VOUT terminal should measure approximately 4.22V (0.62V + 3.6V forward drop of the LED5). Change D0,D1,D2 DAC input terminals that and notice LED current change accordingly. Also note that each LSB change causes an approximate 90mV change at the FB pin. When measuring input/output voltage ripple, care must be taken to avoid a long ground return for the oscilloscope probe. After removing the grabber and outer plastic sleeve from the scope probe, measure the input voltage ripple by touching the probe tip to the VIN terminal and simultaneously touching the probe ground casing to the GND terminal. VOUT ripple is measured similarly between VOUT and its adjacent GND. When measuring VIN ripple, note the importance of the impedance of the bench power supply plus the impedance of the connectors from the supply to the part. The VIN voltage ripple will depend on the ripple current of the LTC3201 times the total impedance mentioned above. In order to see the true effect of the low input noise of the LTC3201, the user should connect the actual application BATTERY. Make sure that the connector between the battery and the DC381A is very short and made with heavy gauge wire. Measure VIN terminal. This ripple now represents the input ripple of the LTC3201 times the impedance of the battery. X-ON Electronics Largest Supplier of Electrical and Electronic Components Click to view similar products for LED Lighting Development Tools category: Click to view products by Analog Devices manufacturer: Other Similar products are found below : MIC2870YFT EV ADP8860DBCP-EVALZ LM3404MREVAL ADM8843EB-EVALZ TDGL014 ISL97682IRTZEVALZ LM3508TLEV EA6358NH MAX16826EVKIT MAX16839EVKIT+ TPS92315EVM-516 MAX1698EVKIT MAX6956EVKIT+ OM13321,598 DC986A DC909A DC824A STEVAL-LLL006V1 IS31LT3948-GRLS4-EB 104PW03F PIM526 PIM527 MAX6946EVKIT+ MAX20070EVKIT MAX21610EVKIT MAX20090BEVKIT MAX20092EVSYS PIM498 AP8800EV1 ZXLD1370/1EV4 MAX6964EVKIT MAX25240EVKIT MAX25500TEVKITC MAX77961BEVKIT06 1216.1013 TPS61176EVM-566 TPS61197EVM TPS92001EVM-628 1270 1271.2004 1272.1030 1273.1010 1278.1010 1279.1002 1279.1001 1282.1000 1293.1900 1293.1800 1293.1700 1293.1500