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SE1484-HF Datasheet(PDF) 3 Page - Seaward Electronics Inc. |
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SE1484-HF Datasheet(HTML) 3 Page - Seaward Electronics Inc. |
3 / 8 page Rev1.0 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com.cn • Page 3 9/4/2012 SE1484 3A 27V Synchronous Buck Converter Recommended Operating Conditions Parameter Symbol Value Units Supply Input Voltage VIN 4.5 to +27 V Operating Junction Temperature TJ -20 to +125 °C Electrical Characteristics VIN = 12V; TJ = 25°C; unless otherwise specified Parameter Symbol Conditions Min Typ Max Unit Feedback Voltage VFB 4.5V ≤ V IN ≤ 27V 0.9 0.925 0.95 V Feedback Overvoltage Threshold 1.1 V High-Side Switch-On Resistance* 90 mΩ Low-Side Switch-On Resistance* 70 mΩ High-Side Switch Leakage VEN = VSW = 0V , 0.1 10 uA Upper Switch Current Limit* Min Duty Cycle 3.8 4.5 A Lower Switch Current Limit* From Drain to Source 1.2 A COMP to Current Limit Trans conductance GCOMP 5.2 A/V Error Amplifier Trans conductance GEA ΔI COMP = ± 10uA 900 uA/V Error Amplifier DC Gain*A VEA 400 V/V Switching Frequency fSW 300 340 380 KHz Short Circuit Switching Frequency VFB = 0V 100 KHz Minimum Duty Cycle DMIN 7.5 % Maximum Duty Cycle DMAX 92 % EN Shutdown Threshold Voltage VEN Rising 1.1 1.4 2 V EN Shutdown Threshold Voltage Hysteresis 180 mV EN Lockout Threshold Voltage 2.2 2.5 2.7 V EN Lockout Hysteresis 150 mV Supply Current in Shutdown VEN = 0V 0.3 3.0 uA IC Supply Current in Operation VEN = 3V, VFB=1.0V 1.3 1.5 mA Input UVLO Threshold Rising UVLO VEN Rising 3.8 4.0 4.4 V Input UVLO Threshold Hysteresis 150 mV Soft-start Current VSS = 0V 6 uA Soft-start Period CSS =0.1uF 15 mS Thermal Shutdown Temperature* Hysteresis =25°C 155 ℃ Note: * Guaranteed by design, not tested |
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