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SP7648 Datasheet(PDF) 2 Page - Sipex Corporation |
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SP7648 Datasheet(HTML) 2 Page - Sipex Corporation |
2 / 4 page 2 USING THE EVALUATION BOARD 1) Powering Up the SP7648 Circuit The SP7648 Evaluation Board can be powered from inputs from +2.7V to +4.2V from a Li-Ion battery. Connect with short leads directly to the “Vbatt” and “Gnd” posts. Monitor the Output, Vref Voltage and connect the LED between the “Vout” post and the “Vref” post. 2) Using the SW1 switch and the J3 Jumper: Enabling the SP7648 Output and using the Shutdown Mode Pressing the ON/OFF button (SW1) will put the SHDN pin to VIN, which enables the SP7648. Otherwise the 1M R5 pull-down puts 0V to the SHDN pin and puts the SP7648 in the low quiescent Shutdown Mode. The SP7648 output will be in FLASH mode if the J3 Jumper is in the top or pin 1 to 2 position. If J3 is in the pin 2 to 3 position, the SP7648 will be in the Torch mode. 3) Using the Rlim Function The peak inductor current, IPEAK, is programmed externally by the RLIM resistor connected between the RLIM pin and GND. The peak inductor current is defined by: IPEAK = 1600/RLIM The SP7648 has a range for RLIM of 1.0K to 9.09K ohms. Using the IPEAK equation above gives an IPEAK range of IPEAK range = 176mA to 1600mA. The saturation current specified for the inductor needs to be greater then the peak current to avoid saturating the inductor, which would result in a loss in efficiency and could damage the inductor. The SP7648 evaluation board uses an Rlim value of 1.0K for an Ipeak = 1600mA to allow the circuit to deliver 700mA for 3.6V input. Other values could be selected using the above relationships. |
Similar Part No. - SP7648_05 |
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Similar Description - SP7648_05 |
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