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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LM2647 bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI) |
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LM2647 bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI) |
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6 / 25 page  Electrical Characteristics (Continued) Specifications with standard typeface are for T J = 25˚C, and those with boldface apply over full Operating Junction Tempera- ture range. VDD = V5 = 5V, V SGND =VPGND = 0V, VIN = 15V, VEN = 3V, RFADJ = 22.1K unless otherwise stated. (Note 5) Symbol Parameter Conditions Min (Note 6) Typical (Note 7) Max (Note 6) Units Power Good V PGOOD_HI Power Good Upper Threshold as a Percentage of Internal Reference FB voltage rising above V FB_REG 110 113 116 % V PGOOD_LOW Power Good Lower Threshold as a Percentage of Internal Reference FB voltage falling below V FB_REG 84 87 90 % Power Good Hysteresis 7 % ∆t PG_OK Power Good Delay From both output voltages “good” to PGOOD assertion. 10 20 30 µs ∆t PG_NOK From the first output voltage “bad” to PGOOD de-assertion 4 7 10 ∆t SD From Enable low to PGOOD low 0.03 0.1 PGOOD Saturation Voltage PGOOD de-asserted (Power Not Good) and sinking 1.5mA 0.12 0.4 V PGOOD Leakage Current PGOOD = 5V and asserted 0 1 µA OV and UV Protection Fault OVP Latch Threshold as a Percentage of Internal Reference FB voltage rising above V FB_REG 125 130 135 % Fault UVP Latch Threshold as a Percentage of Internal Reference FB voltage falling below V FB_REG 65 70 75 % ∆t FAULT Fault Delay From Fault detection (any output) to Fault assertion 7µs Soft-start I SS_CHG Soft-start Charging Current V SS =1V 8 11 14 µA R SS_DCHG Soft-shutdown Resistance (SS pin to SGND, either channel) V EN = 0V, VSS = 1V 1800 Ω I SS_DCHG Soft-start Discharge Current In Current Limit 80 115 160 µA V SS_RESET Soft-start pin reset voltage (Note 8) SS charged to 0.5V, EN low to high 100 mV SS to COMP Offset Voltage V SS = 0.5V and 1V, VFB1 =VFB2 = 0V 600 mV Error Amplifier GAIN DC Gain 70 dB Voltage Slew Rate COMP rising 4.45 V/µs COMP falling 2.25 BW Unity Gain Bandwidth COMP falling 6.5 MHz COMP Source Current V FB < VFB_REG V COMP = 0.5V 2 5mA COMP Sink Current V FB > VFB_REG V COMP = 0.5V 7 14 mA Current Limit and Zero-Cross I ILIM I LIM Pin Current (sourcing, either ILIM pin) V ILIM1 =VILIM2 =0V 46 62 76 µA I ILIM Threshold Voltage -10 0 10 mV www.national.com 6 |
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