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LM2590HV Folha de dados(PDF) 4 Page - Texas Instruments

Nome de Peças LM2590HV
Descrição Electrónicos  SIMPLE SWITCHER Power Converter
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM2590HV Folha de dados(HTML) 4 Page - Texas Instruments

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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.


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