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UPSRB02 Folha de dados(PDF) 6 Page - Unisonic Technologies |
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UPSRB02 Folha de dados(HTML) 6 Page - Unisonic Technologies |
6 / 7 page UPSRB02 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 7 www.unisonic.com.tw QW-R103-079.b OPERAT I ON DESCRI PT I ON (Cont .) At no load, the actual CS threshold is: VCS_no_Load=0.5-(ICS_MAX)×Rd (V) Current Sensing and Leading Edge Blanking Cycle-by-cycle current limiting is offered in UTC UPSRB02. The switch current is detected by a sense resistor into the CS pin. When the power switch is turned on, a turn-on spike will occur on this resistor. A 500ns leading-edge blanking is built in to avoid false-termination of the switching pulse so that the external RC filtering is no longer needed. Drive BJT The driver is a push pull stage with the supply voltage VDD. It provides the driving current for the external power bipolar transistor. The output signal is current-limited to IOUT(SOURCE). Protection Control Good power supply system reliability is achieved with its comprehensive protection features including output over-voltage protection, VDD over voltage protection, OTP, feedback loop open protection, Cycle-by-cycle current limiting, short circuit protection, leading edge blanking and UVLO, etc. VDD is supplied by transformer auxiliary winding output. The output of UTC UPSRB02 is shutdown when VDD drops below VTH(OFF) and the power converter enters power on start-up sequence thereafter. |
Nº de peça semelhante - UPSRB02_16 |
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Descrição semelhante - UPSRB02_16 |
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