FZT849 Diodes Incorporated

Design Note 16 Design Note 17 Issue 2 June 1995 Issue 2 June 1995 Low Drop Out Linear Regulators Gaming Machine Lamp Driver FZT949 +5V +34 to 45V + 7.2 to 5.2V Unreg. Control input Sense ZTX951 12V 0.1A 0V 0V ZTX107 0V 0V Row Columns Sense Unreg. Control Column input Rows ZTX690B - 7.2 to -5.2V -5V FZT849 Etc. 0V Unlike standard regulator circuits and applications where power dissipation / ICs which need at least 2V or more heatsink savings can be realised. x 8 for an 8 x 8 matrix of lamps across the series pass transistor to In slot machines and other applications The ZTX951 and ZTX690B Super E-Line The ultra low saturation voltage of the operate, low drop out (LDO) regulators where a large number of lamps must be (TO92 style) transistors can easily ZBD849 and ZBD949 transistors enable can function with only 100 - 200mV controlled, matrix circuits are employed replace these costly drivers. The high these linear regulators to operate at differential. to radically reduce the number of lamp gain ZTX690B features a saturation currents of 5A continuously with drivers required. Here, each row is voltage of 220mV at 800mA with just drop-out voltages of only 180mV for the Low drop-out voltage regulators are selected in turn by control logic or more 4mA of base current allowing direct NPN circuit and 350mV for the PNP. essential for many battery powered usually by an appropriately configured logic drive. The ZTX951 needs 100mA of applications including computers and micro-controller. During row selection, Packaged in the compact TO126, these base current to handle lamp turn-on other logic applications, in order to the appropriate column drivers are high performance transistors are easy to maximise useful battery life and reduce surges, and will give a saturation voltage activated to give the required display mount and can be used free-standing for re-charge frequency. below 100mV in normal operation. output. Consequently, each row driver lower output current applications. must drive 8 lamps simultaneously, Automotive electronics is another Surface mount and through-hole The number of bulbs driven can be taking a worst case surge current of 6A. applicable area, where in engine options are available in the SOT223 and easily increased by adding row drivers The column drivers must have very high management systems they are E-Line (TO92 style )packages. and increasing the supply voltage to gains to pass surges of up to 800mA employed to ensure that the circuitry is maintain lamp power with reduced duty using direct logic interfacing. TO126 or correctly powered even when the The control circuit used can be a cycles. With a supply of 45V, 16 rows TO220 packaged Darlingtons are automobile is cranking, and the batterys standard IC such as the LT1123 or a routinely selected for these drivers. (128 lamps) can be accommodated. terminal voltage has fallen to 6 or 7V. discrete design if the application They are also useful in mains powered requires extra flexibility. DN16-1 DN17-1 Control LogicX-ON Electronics Largest Supplier of Electrical and Electronic Components Click to view similar products for diodes incorporated manufacturer: Other Similar products are found below : 1.5KE62A-T MMSZ5232BQ-13-F DMN2065UW-7 AH3782-SA-7 AP7365-39WG-7 6A10-T MBRB10100CT AZ1117EH-5.0TRG1 AZV3002S-13 BZT52C10-7-F PAM2863EV1 SBRT25U60SLP-13 LM2904AQM8-13 GBPC1506 GBU804 GBU808 BCR401UW6-7 DFLR1600-7 DMP4013LFG-7 DMTH6009LK3Q-13 SB560-T APX809-26SAG-7 AP3125AKTR-G1 AL8807EV3 B350A-13-F B560C- 13-F AZV832MMTR-G1 BAS70-05-7-F BAV23S-7-F BC847BW-7-F BC847CT-7-F BC847CW-7-F BC848C-7-F BC848CW-7-F BC858B-7-F BC858C-7-F BCP52TA BCX53TA BCX56TA B550C-13-F BAV20W-7-F 6A6-T BZT52C15T-7 BZX84C5V1TS-7-F DMP6180SK3-13 BZT52C15LP-7 74LVC1G58W6-7 DDTC114ELP-7 BAS40 BZT52C6V2-7-F