ep1551 evaluation board manual rev.01 1/7 description this manual aims to illustrate how to use the ep1551 evaluation board (?ep1551 evb?). the ep1551 evb is a fully assembled and tested circuit board that accepts 1.5v to 3.6v input voltages and provides all the output voltages required for a typical digital still camera. the outputs consist of a main step-up output (3.35v), a step-down output (1.5v), a general-purpose 5v output, two outputs for charge-coupled device (ccd) and lcd bias. this manual includes quick start for using the ep1551 evb, demonstration circuit, pcb layout and bill of material for the ep1551 evb. quick start the ep1551 evb is easy to set up to evaluate the performance of the ep1551, 1mhz, five-channel power supply. for proper measurement equipment set up, please follow the explanation below: follow the steps below to verify operation of the ep1551 evb . do not turn on the power supply until all connections are completed: 1) preset the power supply to between 1.5v and 3.6v. 2) turn off the power supply. 3) connect the power-supply positive lead to in. 4) connect the power-supply ground lead to gnd. 5) connect loads from outputs outsd (1.5v), ou t1 (5v), out3a (+15v), and out3b (-7.5v) to gnd. see as below table for output voltages and maximum currents. 6) to enable the main step-up output, verify that jp1 has short to main pin. 7) verify that jp2?jp8 have pins 1 and 2 shorted. 8) turn on the power supply. 9) use a voltmeter to verify the outsu voltage (3.35v). 10) connect a load, if desired, from outsu (3.35v) to gnd. see table 1 for maximum load currents. 11) to verify other outputs, move jp2?jp5 to short to main pin. use a voltmeter to verify output voltages. p.s. we already have surface-mount leds in ds 1?ds4, connecting the led array from anode to ledout+ to cathode ledout-.
ep1551 evaluation board manual rev.01 2/7 jump setting jumper jump to gnd jump to main jp1 all outputs are shut down outsu enabled jp2 outsd shut down outsd enabled jp3 out1 shut down out1 enabled jp4 ledout shut down ledout enabled jp5 ou t3a/ou t3b shut down ou t3a/ou t3b enabled jp6 out1 set to 5v out1 adjustable jp7 outsd set to 1.5v outsd adjustable jp8 outsu set to 3.35v outsu adjustable fixed output voltages and maximum currents output voltage (v) maximum current (ma) outsu 3.35 500 (note 1) outsd 1.5 350 out1 5 500 ledout+ to ledout 16 (note 2) 15 out3a 15 20 out3b -7.5 (note 3) 30 note 1: if both outsu (3.35v) and outsd (1.5v) are operat ing, subtract half the outsd (1.5v) load current from the maximum load capability of outsu (3.35v). note 2: with four white leds connected in series from ledout+ to ledout-, this output is regulated to approximately 60mw per led. with typical white le ds, this is approximately 16v at 15ma. with an open circuit, ledout+ is approximately 30v. note 3: only the 15v output is fed back to the controller regulation point. a small preload (at least 5ma) is needed for the -7.5v output to be in regulation.
ep1551 evaluation board manual rev.01 3/7 adjusting the main step-up output voltage the main step-up output (outsu 3.35v ) can be adjusted from 2.7v to 5. 5v using the following procedure: 1) short jp8 to main pin. 2) cut the pc board trace that shorts the pads of r12 (located on the solder side of the pc board). 3) select a value for r15 between 10k ? and 100k ? . 4) solve for vout: ? ? ? ? ? ? + = 12 15 1 25 . 1 r r v v out 5) install r12 and r15. adjusting the step-down output voltage the step-down output voltage (outsd 1.5v) can be set from 1.25v to voutsu using the following procedure: 1) short jp7 to main pin. 2) cut the pc board trace that shorts the pads of r13 (located on the solder side of the pc board). 3) select a value for r16 between 10k ? and 100k ? . 4) solve for vout: ? ? ? ? ? ? + = 13 16 1 25 . 1 r r v v out 5) install r13 and r16. adjusting the step-up output voltage out1 (5v) can be set to any voltage above 1.25v. note that out1 rises above its regulation voltage if the input voltage is greater than what out1 is se t to. use the following procedure to set vout1: 1) short jp6 to main pin. 2) cut the pc board trace that shorts the pads of r9 (located on the solder side of the pc board). 3) select a value for r11 between 10k ? and 100k ? . 4) solve for vout: ? ? ? ? ? ? + = 9 11 1 25 . 1 r r v v out 5) install r9 and r11.
ep1551 evaluation board manual rev.01 4/7 demonstration circuit pcb layout
ep1551 evaluation board manual rev.01 5/7 bill of material item qty ref. des. desc. man. p/n note 1 1 l1 power inductor 1.4uh 2.52a smd cr43-1r4mc 2 1 l2 power inductor 2.2uh 1.75a smd cr43-2r2mc 3 1 l3 power inductor4.7uh smd 4 1 l4 power inductor 3.3uh smd 5 1 t1 for -7.5 and +15v output st-532850a 6 3 c14a, c15a, c17a capacitor tant 22uf 25v 20% smd t494b226m016as 7 3 c14a, c15a, c17a, capacitor tant 10uf 10v 20% smd t494b106m010as 8 1 c16 capacitor tant 47uf 10v 20% smd t520b476m006as e040 9 1 c4 cap ceramic 10uf 25v x5r 1206 ecj-3yb1e106m 10 4 c3, c6, c8, c10 cap ceramic 1uf 25v x5r 0805 ecj-2fb1e105k 11 1 c1 cap 10uf 6.3v ceramic x5r 0805 ecj-2fb0j106m 12 1 c13 cap .10uf 16v ceramic x7r 0805 vj0805y104kxjc w1bc 13 1 c12 cap ceramic 100pf 50v np0 0805 vj0805a101jxac w1bc 14 3 r9, r12, r13 res 0.0 ohm 1/8w 5% 0603 smd erj-6gey0r00v 15 1 r8 res 1.00m ohm 1/8w 1% 0603 smd 9c08052a1004fk hft
ep1551 evaluation board manual rev.01 6/7 16 1 r10 res 90.9k ohm 1/8w 1% 0603 smd mcr10ezhf9092 17 1 r17 res 33.0 ohm 1/8w 1% 0603 smd 9c08052a33r0fk hft 18 1 r7 res 2.20k ohm 1/8w 1% 0603 smd 9c08052a2201fk hft 19 1 r4 res 51.0k ohm 1/8w 1% 0603 smd 9c08052a5102fk hft 20 1 r1 res 47k ohm 1/8w 5% 0603 smd 9c08052a4702jl hft 21 1 r2 res 24.9k ohm 1/8w 1% 0805 smd mcr10ezhf2492 22 2 r5, r6 res 10.0k ohm 1/8w 1% 0603 smd 9c08052a1002fk hft 23 1 r3 res 20.0k ohm 1/8w 1% 0603 smd 9c08052a2002fk hft 24 1 c1 cap 6800pf 50v ceramic x7r 0603 vj0805y682kxac w1bc 25 1 c2 cap 3300pf 50v ceramic x7r 0603 vj0805y332kxac w1bc 26 1 c5 cap cerm .01uf 10% 50v x7r 0603 08055c103kat2a 27 2 c7, c9 cap 1000pf 50v ceramic x7r 0603 vj0805y102kxac w1bc 28 1 r14 res 36.5k ohm 1/8w 1% 0603 smd mcr10ezhf3652 29 3 q1, q2, q3 hex/mos n-ch 30v 10a 8-soic si4410dy 30 9 red test point pc multi purpose 5010 31 28 black test point pc multi purpose 5011
ep1551 evaluation board manual rev.01 7/7 32 9 shunt shunt lp w/handle 2 pos 30au 881545-2 33 5 d1 - d5 diode schottky 1a 20v 1n5819 34 4 ds1 - ds4 led green face up 1206 lnj311g8tra 35 1 jp9 conn header vert .100 2pos 30au 87220-2 36 5 jp1-5 conn header vert .100 3pos 15au 87224-3 37 3 jp6 - 8 conn header vert .100 6pos 15au 87227-3
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