USERS MANUAL ISL9440EVAL2Z AN1550 Rev 0.00 Triple PWM Step-Down Synchronous Buck Controller and One LDO Mar 8, 2010 Evaluation Board TABLE 1. FEATURES OF ISL944xx FAMILY ISL9440EVAL2Z Evaluation SWITCHING SOFT-STARTING Board PART EARLY FREQUENCY TIME The ISL9440EVAL2Z evaluation board features the NUMBER WARNING (kHz) (ms) ISL9440. The ISL9440 is a quad-output controller that ISL9440 Yes 300 1.7 integrates three PWM synchronous buck controllers and one low-dropout linear regulator controller. The ISL9440 ISL9440A Yes 600 1.7 offers internal soft-start, independent enable functions ISL9441 No 300 1.7 and integrates UV/OV/OC/OT protection. Its current mode control architecture and internal compensation ISL9440B Yes 300 Programmable network keep peripheral component count minimal. ISL9440C Yes 600 Programmable Switching frequency of 300kHz minimizes losses while the strong gate drivers deliver up to 12A to each PWM The ISL9440EVAL2Z is easy to set up to evaluate the channel. performance of the ISL9440. Please refer to the Table 1 shows the difference in terms of ISL944xx family Electrical Specifications table on page 2 for typical features. performance summary. FIGURE 1. ISL9440EVAL2Z EVALUATION BOARD AN1550 Rev 0.00 Page 1 of 12 Mar 8, 2010ISL9440EVAL2Z Electrical Specifications Recommended operation conditions unless otherwise noted. Refer to the Schematic on page 7 and Typical Evaluation Board Performance Curves on page 4. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS V All outputs are in regulation 6.0 12 16 V IN V 1 1.45 1.50 1.54 V OUT V 2 2.43 2.50 2.57 V OUT V 3 4.85 5.0 5.15 V OUT V 4 3.20 3.30 2.39 V OUT PWM1 Rated Current V = 12V, T = +25C, No forced airflow, All 67 A IN A three PWM outputs are fully loaded PWM2 Rated Current 67 A PWM3 Rated Current 45 A LDO Rated Current R = 0 , R is not populated 0.8 1.0 A 4 7 V 1 Peak-to-Peak Ripple V = 12V, All three PWM outputs are fully loaded, 29.4 mV OUT IN P-P Oscilloscope is with full bandwidth V 2 Peak-to-Peak Ripple 15.7 mV OUT P-P V 3 Peak-to-Peak Ripple 31.4 mV OUT P-P Whats Inside Quick Test Guide The evaluation board kit contains the following materials: 1. Ensure that the circuit is correctly connected to the supply and electronic loads prior to applying any The ISL9440EVAL2Z power. Please refer to Figure 2 for proper set-up. The ISL9440, ISL9440A, ISL9441 Datasheet FN6383 2. Connect Jumpers J , J and J in the ENx positions. 3 4 5 This Evaluation Board Kit document (AN1550) 3. Turn on the power supply. 4. Adjust input voltage V within the specified range IN Recommended Equipment and observe output voltage. The output voltage The following materials are recommended to perform variation should be within 3%. testing: 5. Adjust load current within the specified range and observe output voltage. The output voltage 0V to 20V Power Supply with at least 10A source variation should be within 3%. current capability 6. Use oscilloscope to observe output voltage ripple Three electronic loads capable of sinking current up and phase node ringing. For accurate measurement, to 7A please follow setup shown in Figure 3. Digital Multimeters (DMMs) 100MHz Quad-Trace Oscilloscope Signal Generator (for load transient tests) AN1550 Rev 0.00 Page 2 of 12 Mar 8, 2010