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SS32 Arkusz danych(PDF) 3 Page - Monolithic Power Systems |
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SS32 Arkusz danych(HTML) 3 Page - Monolithic Power Systems |
3 / 11 page MP1591 – 2A, 32V, 330KHz STEP-DOWN CONVERTER MP1591 Rev. 2.3 www.MonolithicPower.com 3 9/27/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (continued) VIN = 12V, TA = +25°C, unless otherwise noted. Parameter Symbol Condition Min Typ Max Units Thermal Shutdown (4) 160 °C REF Voltage IREF = 0 5.0 V REF Load Regulation (4) ∆IREF = 0 to 1mA 100 mV REF Line Regulation (4) IREF = 100µA, VIN = 6.5 to 32V 30 mV Notes: 4) These parameters are guaranteed by design, not production tested. 5) Equivalent output current = 1.5A ≥ 50% Duty Cycle 2.0A ≤ 50% Duty Cycle Assumes ripple current = 30% of load current. Slope compensation changes current limit. PIN FUNCTIONS Pin # Name Description 1 BS High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET switch. Connect a 10nF or greater capacitor from SW to BS to power the high-side switch. 2 IN Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 6.5V to 32V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor. 3 SW Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side switch. 4 GND Ground. For the MP1591DN, connect the Exposed Pad to pin 4. 5 FB Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive voltage divider from the output voltage. The feedback threshold is 1.230V. See Setting the Output Voltage . 6 COMP Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND to compensate the regulation control loop. In some cases, an additional capacitor from COMP to GND is required. See Compensation. 7 EN Enable/UVLO. A voltage greater than 2.8V enables operation. For complete low current shutdown the EN pin voltage needs to be less than 800mV. 8 REF Reference Output. REF is the 5V reference voltage output. It can supply up to 1mA to external circuitry. If used, bypass REF to GND with 10nF or greater capacitor. Leave REF unconnected if not used. |
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