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TL5001IDRG4 Arkusz danych(PDF) 4 Page - Texas Instruments |
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TL5001IDRG4 Arkusz danych(HTML) 4 Page - Texas Instruments |
4 / 32 page TL5001, TL5001A PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS084F – APRIL 1994 – REVISED JANUARY 2002 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 dead-time control (DTC) (continued) R DT + Rt ) 1250 D Voscmax – Voscmin ) Voscmin Where RDT and Rt are in ohms, D in decimal Soft start can be implemented by paralleling the DTC resistor with a capacitor (CDT) as shown in Figure 2. During soft start, the voltage at DTC is derived by the following equation: V DT [ I DT R DT 1– e – t R DT C DT TL5001/A DTC CDT RDT 6 Figure 2. Soft-Start Circuit If the dc-to-dc converter must be in regulation within a specified period of time, the time constant, RDTCDT, should be t0/3 to t0/5. The TL5001/A remains off until VDT ≈ 0.7 V, the minimum ramp value. CDT is discharged every time UVLO or SCP becomes active. undervoltage-lockout (UVLO) protection The undervoltage-lockout circuit turns the output transistor off and resets the SCP latch whenever the supply voltage drops too low (approximately 3 V at 25 °C) for proper operation. A hysteresis voltage of 200 mV eliminates false triggering on noise and chattering. short-circuit protection (SCP) The TL5001/A includes short-circuit protection (see Figure 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 1.5 V. If the short is removed and the error-amplifier output drops below 1.5 V before time out, normal converter operation continues. If the fault is still present at the end of the time-out period, the timer sets the latching circuit and turns off the TL5001/A output transistor. |
Podobny numer części - TL5001IDRG4 |
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Podobny opis - TL5001IDRG4 |
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