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LM2639M 数据表(PDF) 3 Page - National Semiconductor (TI) |
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LM2639M 数据表(HTML) 3 Page - National Semiconductor (TI) |
3 / 8 page Electrical Characteristics (Continued) V CC5V = 5V, VCC12V = 12V unless otherwise specified. Typicals and limits appearing in plain type apply for TA = TJ = +25˚C. Limits appearing in boldface type apply over the entire operating temperature range. Symbol Parameter Conditions Min Typ Max Units V OCC_CM Over-current Comparator Common Mode Range 312 V IB_OC+ OC+ Input Bias Current V IN = 5V, OC+ = 5V, OC− = 4V 100 145 200 µA IB_OC− OC− Input Bias Current V IN = 5V, OC+ = 6V, OC− = 5V 85 125 165 µA V OS_OCC Over-current Comparator Input Offset Voltage V IN = 5V 2 16 42 mV V IN = 12V 21 D MAX Maximun Duty Cycle FB = 0V 78 % gm Error Amplifier Transconductance 1.36 mmho V ramp Ramp Signal Peak-to-Peak Amplitude 2V I comp COMP Pin Source Current 250 400 550 µA I comp COMP Pin Sink Current 160 280 400 µA V comp_hi COMP Pin High Clamp 2.9 V V comp_lo COMP Pin Low Clamp 0.19 V V POR Power On Reset Trip Point Vcc5V Pin Voltage Rising 4.0 V Vcc5V Pin Voltage Falling 3.6 Vcc12V Minimum Working Voltage (Note 7) 3.8 V t SS Soft Start Delay F OSC = 8MHz 1.6 ms Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating ratings do not imply guaranteed performance limits. Note 2: Maximum allowable power dissipation is a function of the maximum junction temperature, TJMAX, the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PMAX = (TJMAX −TA)/θJA. The junction-to-ambient thermal resistance, θJA, for LM2639 is 78˚C/W. For a TJMAX of 150˚C and TA of 25˚C, the maximum allowable power dissipation is 1.6W. Note 3: The letter N stands for the typical output voltages appearing in italic boldface type in Table 1. Note 4: Max value of logic low means any voltage below this value is guaranteed to be taken as logic low whereas a voltage higher than this value is not guaranteed to be taken as a logic low. Note 5: Min value of logic high means any voltage above this value is guaranteed to be taken as logic high whereas a voltage lower than this value is not guaranteed to be taken as a logic high. Note 6: When driving bipolar FET drivers in the typical application circuit. Note 7: When Vcc12V pin goes below this voltage, all DRV pins go to 0V. Note 8: ESD ratings for pins DRV0, DRV1, DRV2 and DRV3 is 1kV. ESD rating for all other pins is 2kV. www.national.com 3 |
类似零件编号 - LM2639M |
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类似说明 - LM2639M |
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