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LM2590HV Folha de dados(PDF) 4 Page - Texas Instruments |
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LM2590HV Folha de dados(HTML) 4 Page - Texas Instruments |
4 / 35 page 4 LM2590HV SNVS084C – DECEMBER 2001 – REVISED JULY 2016 www.ti.com Product Folder Links: LM2590HV Submit Documentation Feedback Copyright © 2001–2016, Texas Instruments Incorporated Pin Functions (continued) PIN TYPE(1) DESCRIPTION NO. NAME 7 SD/SS I Shutdown/Soft-start: The regulator is in shutdown mode, drawing about 90 μA, when this pin is driven to a low level ( ≤0.6 V), and is in normal operation when this Pin is left floating (internal-pullup) or driven to a high level ( ≥2 V). The typical value of the threshold is 1.3 V and the pin is internally clamped to a maximum of about 7 V. If it is driven higher than the clamp voltage, it must be ensured by means of an external resistor that the current into the pin does not exceed 1 mA. The duty cycle is minimum (0%) if this Pin is below 1.8 V, and increases as the voltage on the pin is increased. The maximum duty cycle (100%) occurs when this pin is at 2.8 V or higher. So adding a capacitor to this pin produces a soft-start feature. An internal current source will charge the capacitor from zero to its internally clamped value. The charging current is about 5 µA when the pin is below 1.3 V but is reduced to only 1.6 µA above 1.3 V, so as to allow the use of smaller soft-start capacitors. |
Nº de peça semelhante - LM2590HV_16 |
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Descrição semelhante - LM2590HV_16 |
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