ISL85012EVAL1Z Renesas

600kHz 300kHz HICCUP DISABLE ENABLE LATCH-OFF CCM DCM USERS MANUAL ISL85012EVAL1Z UG093 Rev.0.00 12A Evaluation Board User Guide Oct 3, 2016 Description Key Features The ISL85012 features integrated power switches that are Small, compact design capable of delivering 12A of continuous current within a Switch selectable EN (enabled/disabled) 3.5mmx3.5mm package. The board is used to evaluate the Jumper selectable MODE (auto-DCM/forced-PWM) performance of the ISL85012, high efficiency synchronous buck regulator. Jumper selectable OCP MODE (hiccup/latch-off) Jumper selectable default frequency (600kHz/300kHz) Specifications Connectors and test points for easy probing This board has been configured and optimized for the following Related Literature operation conditions: For a full list of related documents please visit our web page V = 4.5V to 18V IN - ISL85012 product page V = 1.8V OUT I = 12A OUTmax Ordering Information f = 600kHz SW Peak efficiency = 90% PART NUMBER DESCRIPTION Output ripple <1% of the output voltage ISL85012EVAL1Z Evaluation Board for ISL85012 Transient response: 5% (25% to 75% load 1.6A/s) Operating junction temperature range: -40C to +125C 200k 100k R R2 1 200 R 3 C 1 4.7pF 15 14 13 12 11 10 VIN EN DNC DNC COMP FB PVIN PVIN 9 L1 4.5V TO 18V 1.8V/12A C IN PHASE 8 V OUT 0.68H C OUT GND C GND 7 4 100nF GND SYNC MODE FREQ PG VDD BOOT 12 3 4 5 6 C 3 2.2F FIGURE 1. BLOCK DIAGRAM UG093 Rev.0.00 Page 1 of 9 Oct 3, 2016ISL85012EVAL1Z Quick Setup Guide Evaluating Other Output Voltages 1. Ensure that the circuit is correctly connected to the supply (PVIN/GND) and loads (VOUT/GND) prior to applying any The ISL85012EVAL1Z output is preset to 1.8V. The output power. voltages are programmable by the external resistor divider that 2. Verify there is no jumper connected. scales the feedback relative to the internal reference voltage. The output voltage programming resistor, R , will depend on the 3. Verify that the switch is enabled. 5 value chosen for the feedback resistor, R , and the desired 4 4. Turn on the power supply setting at 12V The value for the feedback regulator output voltage, V OUT 5. Verify the output voltage is 1.8V. resistor, R , is typically between 10k and 400k as shown in 4 Equation 1. Recommended Equipment R 0.6V 1 (EQ. 1) ---------------------------------- R = 2 The following materials are recommended to perform testing: V 0.6V OUT 0V to 25V power supply with at least 15A source current If the output voltage desired is 0.6V, then R is left unpopulated. 5 capability R is still required to set the low frequency pole of the modulator 1 Electronic loads capable of sinking current up to 20A compensation. The recommended values for different output applications are summarized in Table 2. Digital Multimeters (DMMs) 100MHz quad-trace oscilloscope Switch/Jumper Control Signal generator The ISL85012EVAL1Z evaluation board contains a switch and jumpers for various controls of the ISL85012 circuitries. Table 1 details this function. TABLE 1. SWITCH SETTINGS SW/JUMP FUNCTION SW5 Enable/Disable J10 Select frequency 600kHz/300kHz J16 Select OCP behavior Hiccup/Latch-off J17 Select light-load operation mode CCM/DCM TABLE 2. DESIGN TABLE FOR DIFFERENT OUTPUT VOLTAGE V (V) 0.9 1 1.2 1.5 1.8 2.5 3.3 5 OUT V (V) 4.5 to 18 4.5 to 18 4.5 to 18 4.5 to 18 4.5 to 18 4.5 to 18 4.5 to 18 6 to 18 IN Frequency (kHz) 300 300 300 600 600 600 600 600 Compensation Internal Internal Internal Internal Internal Internal Internal Internal C (F) 3x22 3x22 3x22 3x22 3x22 3x22 3x22 3x22 IN C (F) 2x560 + 4x100 2x330 + 3x100 2x330 + 3x100 4x100 3x100 4x47 4x47 4x47 OUt L (H) 0.68 0.68 1 0.68 0.68 1 1 1.5 1 R (k ) 100 100 147 150 200 301 365 365 1 R (k ) 200 150 147 100 100 95.3 80.6 49.9 2 C (pF) DNP DNP DNP 10 4.7 4.7 3.3 3.3 1 NOTES: 1. The design table is referencing the schematic shown in Figure 1. 2. Ceramic capacitors are selected for 22F and 100F in the table. 3. 560F (14m ) and 330F (10m ) are selected low ESR conductive polymer aluminum solid capacitors. 4. Inductor 7443340068 (0.68H), 7443340100 (1H) and 7443340150 (1.5H) from Wurth Electronics are selected for the above applications. 5. Recommend to keep the inductor peak-to-peak current less than 5A. UG093 Rev.0.00 Page 2 of 9 Oct 3, 2016