EP1551 Evaluation Board Manual 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 setup, 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), OUT1 (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 DS1–DS4, connecting the LED array from anode to LEDOUT+ to cathode LEDOUT-. Rev.01 1/7 EP1551 Evaluation Board Manual Jump Setting JUMPER JP1 Jump to GND Jump to MAIN 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 MAXIMUM OUTPUT VOLTAGE (V) 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 operating, 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 LEDs, 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. Rev.01 2/7 EP1551 Evaluation Board Manual 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 10kΩ and 100kΩ. ⎛ ⎝ 4) Solve for Vout: V out = 1 . 25 V ⎜ 1 + R 15 ⎞ ⎟ R 12 ⎠ 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 10kΩ and 100kΩ. ⎛ ⎝ 4) Solve for Vout: V out = 1 . 25 V ⎜ 1 + R 16 ⎞ ⎟ R 13 ⎠ 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 set 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 10kΩ and 100kΩ. ⎛ ⎝ 4) Solve for Vout: V out = 1 . 25 V ⎜ 1 + R 11 ⎞ ⎟ R9 ⎠ 5) Install R9 and R11. Rev.01 3/7 EP1551 Evaluation Board Manual DEMONSTRATION CIRCUIT PCB LAYOUT Rev.01 4/7 EP1551 Evaluation Board Manual BILL OF MATERIAL Item QTY REF. DES. 1 1 L1 2 1 L2 3 1 L3 4 1 L4 5 1 T1 6 3 7 3 8 1 C16 9 1 C4 10 4 C3, C6, C8, C10 11 1 C1 12 1 C13 13 1 C12 14 3 R9, R12, R13 15 1 R8 C14A, C15A, C17A C14A, C15A, C17A, DESC. POWER MAN. P/N INDUCTOR 1.4UH 2.52A SMD POWER INDUCTOR 2.2UH 1.75A SMD Note CR43-1R4MC CR43-2R2MC POWER INDUCTOR4.7UH SMD POWER INDUCTOR 3.3UH SMD For -7.5 and +15V output CAPACITOR TANT 22UF 25V 20% SMD CAPACITOR TANT 10UF 10V 20% SMD ST-532850A T494B226M016AS T494B106M010AS CAPACITOR TANT 47UF T520B476M006AS 10V 20% SMD E040 CAP CERAMIC 10UF 25V X5R 1206 CAP CERAMIC 1UF 25V X5R 0805 CAP 10UF 6.3V CERAMIC X5R 0805 ECJ-3YB1E106M ECJ-2FB1E105K ECJ-2FB0J106M CAP .10UF 16V CERAMIC VJ0805Y104KXJC X7R 0805 CAP CERAMIC W1BC 100PF VJ0805A101JXAC 50V NP0 0805 RES 0.0 OHM 1/8W 5% 0603 SMD W1BC ERJ-6GEY0R00V RES 1.00M OHM 1/8W 1% 9C08052A1004FK 0603 SMD Rev.01 HFT 5/7 EP1551 Evaluation Board Manual 16 1 R10 17 1 R17 18 1 R7 19 1 R4 20 1 R1 21 1 R2 22 2 R5, R6 23 1 R3 24 1 C1 25 1 C2 26 1 C5 27 2 C7, C9 28 1 R14 29 3 Q1, Q2, Q3 30 9 RED 31 28 BLACK RES 90.9K OHM 1/8W 1% 0603 SMD MCR10EZHF9092 RES 33.0 OHM 1/8W 1% 9C08052A33R0FK 0603 SMD HFT RES 2.20K OHM 1/8W 1% 9C08052A2201FK 0603 SMD HFT RES 51.0K OHM 1/8W 1% 9C08052A5102FK 0603 SMD HFT RES 47K OHM 1/8W 5% 9C08052A4702JL 0603 SMD HFT RES 24.9K OHM 1/8W 1% 0805 SMD MCR10EZHF2492 RES 10.0K OHM 1/8W 1% 9C08052A1002FK 0603 SMD HFT RES 20.0K OHM 1/8W 1% 9C08052A2002FK 0603 SMD CAP 6800PF HFT 50V VJ0805Y682KXAC CERAMIC X7R 0603 CAP 3300PF W1BC 50V VJ0805Y332KXAC CERAMIC X7R 0603 W1BC CAP CERM .01UF 10% 50V X7R 0603 CAP 1000PF 50V VJ0805Y102KXAC CERAMIC X7R 0603 RES 36.5K OHM 1/8W 1% 0603 SMD HEX/MOS N-CH 30V 10A 8-SOIC TEST POINT PC MULTI PURPOSE TEST POINT PC MULTI PURPOSE Rev.01 08055C103KAT2A W1BC MCR10EZHF3652 SI4410DY 5010 5011 6/7 EP1551 Evaluation Board Manual 32 9 SHUNT 33 5 D1 - D5 34 4 DS1 - DS4 35 1 JP9 36 5 JP1-5 37 3 JP6 - 8 SHUNT LP W/HANDLE 2 POS 30AU DIODE SCHOTTKY 1A 20V LED GREEN FACE UP 1206 CONN HEADER VERT .100 2POS 30AU CONN HEADER VERT .100 3POS 15AU CONN HEADER VERT .100 6POS 15AU Rev.01 881545-2 1N5819 LNJ311G8TRA 87220-2 87224-3 87227-3 7/7