EV1542DK-TFT-00A mp1542 tft applications evaluation board evaluation board EV1542DK-TFT-00A rev. 1.0 www.monolithicpower.com 1 6/22/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. the future of analog ic technology tm tm general description the EV1542DK-TFT-00A is the evaluation board for tft applications using the mp1542. the mp1542 can be operated at 700khz or 1.3mhz allowing for easy filtering and low noise. an external compensation pin gives the user flexibility in setting loop dynamics, which allows the use of small, low-esr ceramic output capacitors. soft-start results in small inrush current and can be programmed with an external capacitor. the mp1542 operates from an input voltage as low as 2.5v and can generate 12v at up to 500ma from a 5v supply. the EV1542DK-TFT-00A provides v out1 from the boost output and also derives v out3 (positive) and v out2 (negative) from the charge pumps off of the boost switching node. electrical specifications parameter symbol value units input voltage v in 3 ? 3.6 v output voltage 1 v out1 9 v output current 1 i out1 150 ma output voltage 2 v out2 ?8 v output current 2 i out2 10 ma output voltage 3 v out3 26 v output current 3 i out3 5 ma features ? 3 outputs in a single package: boost converter for 9v, positive charge pump for 26v and negative charge pump for ?8v ? 3v to 3.6v operating input range ? uses tiny capacitors and inductors ? 700khz/1.3mhz fixed switching frequency ? externally compensated ? programmable soft-start ? uvlo, thermal shutdown ? internal current limit applications ? handheld computers and pdas ? digital still and video cameras ? small lcd displays ?mps? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. EV1542DK-TFT-00A evaluation board dimensions (2.0?x x 2.0?y x 0.4?z) board number mps ic number EV1542DK-TFT-00A mp1542dk
EV1542DK-TFT-00A ? mp1542 tft applications evaluation board evaluation board EV1542DK-TFT-00A rev. 1.0 www.monolithicpower.com 2 6/22/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm evaluation board schematic c8 ns vout2 -8v / 10ma vout3 +26v / 5ma vout1 +9v / 150ma vin +3.3v gnd en gnd c15 ns c12 ns c13 ns d6 ns d5 ns d4 bat54s d3 bat54s d2 bat54s d1 1n5819hw-7 c3 2.2nf c4 22nf ev1542-tft-00a-s01 note: the traces beneath d6 must be cut before placement of the diode. mp1542 in fb sw comp gnd en 5 6 2 1 4 8 7 3 fsel ss jp1 frequency selection
EV1542DK-TFT-00A ? mp1542 tft applications evaluation board evaluation board EV1542DK-TFT-00A rev. 1.0 www.monolithicpower.com 3 6/22/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm EV1542DK-TFT-00A bill of materials qty ref value description package manufacturer manufacturer p/n 5 c1a, c1b, c2, c5, c6 3.3f ceramic cap, 10v, x7r 1210 taiyo yuden lmk325bj335kd 1 c3 2.2nf ceramic cap, 100v, x7r 0805 tdk c2012x7r2a222k 1 c4 22nf ceramic cap, 50v, x7r 0603 tdk c1608x7r1h223k 3 c7, c11, c14 1f ceramic cap, 25v, x7r 0805 tdk c2012x7r1e105k 4 c8, c12, c13, c15 do not stuff 2 c9, c10 0.1f ceramic cap, 25v, x7r 0805 tdk c2012x7r1e104k 1 c16 2.2f ceramic cap, 25v, x5r 1206 murata grm316r61e225ka12d 1 d1 schottky diodes, 40v, 1a sod123 diodes inc 1n5819hw-7 3 d2, d3, d4 schottky diodes, 30v, 200ma sot-23 fairchild bat54s 2 d5, d6 do not stuff 1 jp1 3-pin connector header, 0.100 sullins ptc03saan 1 l1 6.8h 1.7a coilcraft lpo2506ib-682 1 r1 61.9k ? resistor, 1% 0805 panasonic erj-6enf6192v 1 r2 10k ? resistor, 1% 0805 panasonic erj-6enf1002v 1 r3 10k ? resistor, 5% 0805 panasonic erj-6geyj103v 2 r4, r5 100k ? resistor, 5% 0805 panasonic erj-6geyj104v 1 u1 dc-dc converte r msop8 mps mp1542dk
EV1542DK-TFT-00A ? mp1542 tft applications evaluation board evaluation board EV1542DK-TFT-00A rev. 1.0 www.monolithicpower.com 4 6/22/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm printed circuit board layout figure 1?top silk layer figure 2?top layer figure 3?bottom layer
EV1542DK-TFT-00A ? mp1542 tft applications evaluation board evaluation board notice: the information in this document is subject to change wi thout notice. please contact mps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. EV1542DK-TFT-00A rev. 1.0 www.monolithicpower.com 5 6/22/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm quick start guide the output voltage of this board is set to 9v, ?8v and 26v on vout1, vout2 and vout3, respectively. the board layout accommodates most commonly used inductors and output capacitors. 1. preset the power supply to 3v v in 3.6v. 2. turn off the power supply. 3. connect the power supply terminals to: a. positive (+): vin, en b. negative (?): gnd 4. connect the load to: a. positive (+): vout1, vout3, gnd (for the negative output) b. negative (?): gnd, vout2 (for the negative output) 5. turn on the power supply after making the connections. 6. the mp1542 is disabled on the evaluation board if only vin is applied. to enable the mp1542, en needs to be pulled high. 7. the output voltage v out1 can be changed by varying r1. calculate the new value using the formula: 2 r 1 v v 1 r fb 1 out ? ? ? ? ? ? ? ? ? = where v fb = 1.25v and r2 = 10k ? for example, for v out1 = 7.5v ? = ? ? ? ? ? ? ? ? = k 50 k 10 1 v 25 . 1 v 5 . 7 1 r therefore use a 49.9k ? standard 1% value resistor.
|
