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TL5001L-S08-T Arkusz danych(PDF) 8 Page - Unisonic Technologies |
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TL5001L-S08-T Arkusz danych(HTML) 8 Page - Unisonic Technologies |
8 / 13 page TL5001 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 8 of 13 www.unisonic.com.tw QW-R103-016,D DETAILED DESCRIPTION(Cont.) SHORT-CIRCUIT PROTECTION (SCP) The UTC TL5001 includes short-circuit protection (see Fig. 3), which turns the power switch off to prevent damage when the converter output is shorted. When activated, The SCP prevents the switch from being turned on until the internal latching circuit is reset. The circuit is reset by reducing the input voltage until UVLO becomes active or until the SCP terminal is pulled to ground externally. When a short circuit occurs, the error-amplifier output at COMP rises to increase the power-switch duty cycle in an attempt to maintain the output voltage. SCP comparator 1 starts an RC timing circuit when COMP exceeds 1.5V.If the short is removed and the error-amplifier output drops below 1.5V before time out, normal converter operation continues. If the fault is still present at the end of the time-out period, the time sets the latching circuit and turns off the UTC TL5001 output transistor. 2.5V RSCP 185kΩ 12kΩ CSCP SCP From Error Amp 1.5V scp Comparator 1 Q2 Q1 VREF=1V scp Comparator 2 To Output Drive Logic Fig. 3 SCP Circuit 5 The timer operates by charging an external capacitor (CSCP),connected between the SCP terminal and ground, towards 2.5V through a 185k Ω resistor (RSCP).The circuit begins charging from an initial voltage of approximately 185mV and times out when capacitor voltage reaches 1V.The output of SCP comparator 2 then goes high, turns on Q2,and latches the timer circuit. The expression for setting the SCP time period is derived from the following equation: VSCP =(2.5-0.185)(1-e -t/ τ)+0.185 Where ι=RSCPCSCP The end of the time-out period, tSCP, occurs when VSCP=1V. Solving for CSCP yields: CSCP=12.46*tSCP Where t is in seconds, C in µF tSCP must be much longer (generally 10 to 15 times) than the converter start-up period or the converter will not start. OUTPUT TRANSISTOR The output of the UTC TL5001 is an open-collector transistor with a maximum collector current rating of 21mA and a voltage rating of 51V.The output is turned on under the following conditions: the oscillator triangle wave is lower than both the DTC voltage and the error-amplifier output voltage, the UVLO circuit is inactive, and the short-circuit protection circuit is inactive. |
Podobny numer części - TL5001L-S08-T |
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Podobny opis - TL5001L-S08-T |
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