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TL5001CPSLE Datasheet(PDF) 5 Page - Texas Instruments |
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TL5001CPSLE Datasheet(HTML) 5 Page - Texas Instruments |
5 / 32 page TL5001, TL5001A PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS084F – APRIL 1994 – REVISED JANUARY 2002 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 short-circuit protection (SCP) (continued) Q1 12 k Ω 185 k Ω RSCP Q2 SCP Comparator 2 Vref = 1 V SCP Comparator 1 1.5 V From Error Amp CSCP To Output Drive Logic SCP 5 2.5 V Figure 3. SCP Circuit The timer operates by charging an external capacitor (CSCP), connected between the SCP terminal and ground, towards 2.5 V through a 185-k Ω resistor (RSCP). The circuit begins charging from an initial voltage of approximately 185 mV and times out when the capacitor voltage reaches 1 V. 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: V SCP + (2.5 * 0.185) 1 * e–t t ) 0.185 Where τ = RSCPCSCP The end of the time-out period, tSCP, occurs when VSCP = 1 V. Solving for CSCP yields: C SCP + 12.46 t SCP 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 TL5001/A is an open-collector transistor with a maximum collector current rating of 21 mA and a voltage rating of 51 V. 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. |
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