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TPS61042DRBR Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS61042DRBR
Description  CONSTANT CURRENT LED DRIVER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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TPS61042DRBR Fiches technique(HTML) 11 Page - Texas Instruments

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Overvoltage Protection (OVP)
Undervoltage Lockout
Thermal Shutdown
TPS61042
SLVS441C – DECEMBER 2002 – REVISED MARCH 2007
DETAILED DESCRIPTION (continued)
As with any current source, the output voltage rises as the output impedance increases or is disconnected. To
prevent the output voltage from exceeding the maximum main switch (Q1) voltage rating of 30 V, an overvoltage
protection circuit is integrated. When the output voltage exceeds the OVP threshold voltage, (Q1) turns off. The
converter switch remains off until the output voltage falls below the OVP threshold voltage. As long as the output
voltage is below the OVP threshold the converter continues its normal operation, until the output voltage
exceeds the OVP threshold again.
An undervoltage lockout feature prevents mis-operation of the device at input voltages below 1.5 V (typ). As long
as the input voltage is below the undervoltage threshold the device remains off, with the main MOSFET switch
(Q1) and the LED switch (Q2) open.
An internal thermal shutdown is implemented in the TPS61042 that shuts down the device if the typical junction
temperature of 160
°C is exceeded. If the device is in thermal shutdown mode, the main MOSFET switch (Q1)
and the LED switch (Q2) are open.
11
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