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ST890DTR Fiches technique(PDF) 9 Page - STMicroelectronics |
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ST890DTR Fiches technique(HTML) 9 Page - STMicroelectronics |
9 / 20 page ST890 Maximum rating 9/20 2.1 Functional description 2.1.1 Output current limit ILIM is the output current that ST890 limits under the condition VO (output voltage) > 1.6 V. When ILIM is reached, the Fault pin is asserted. 2.1.2 Output short circuit protection The ST890 provides short circuit protection by limiting the output current during a short circuit event. Isc is the output short circuit current limit level (typ 1.2 x ILIM). When the output is short circuit such as VO < 1.6 V, the ST890 limits the output current to no more than the Isc level. When the output is short circuit, the Fault pin is asserted. 2.1.3 Programming ILIM The ST890's ILIM can be programmed through the external resistor, RSET connected at the SET pin (pin 5). ILIM is determined by the following relationships: Equation 1 Equation 2 therefore: Equation 3 2.1.4 Fault pin The Fault pin (pin 8) is an open drain active low output. This pin should be connected to an external pull-up resistor. The Fault pin is asserted low when: –IOUT reaches the programmed ILIM value – A short circuit event occurs – The device goes into thermal protection 2.1.5 Thermal protection The ST890's thermal protection is triggered to turn off the switch when the junction temperature exceeds 130°C (typ). SET SET SET R / V = I 1110 = I / I SET LIM LIM SET I / 1110 x 1.24 = R |
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Description similaire - ST890DTR |
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