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TL5001AQDRG4Q1 Folha de dados(PDF) 4 Page - Texas Instruments |
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TL5001AQDRG4Q1 Folha de dados(HTML) 4 Page - Texas Instruments |
4 / 17 page V DT [ IDTRDT 1 * e * t R DT C DT (2) TL5001/A DTC CDT RDT 6 UNDERVOLTAGE-LOCKOUT (UVLO) PROTECTION SHORT-CIRCUIT PROTECTION (SCP) 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 TL5001A-Q1 SLVS603B – AUGUST 2005 – REVISED FEBRUARY 2009 .............................................................................................................................................. www.ti.com 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: 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 TL5001A remains off until VDT ≈ 0.7 V, the minimum ramp value. CDT is discharged every time UVLO or SCP becomes active. 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. The TL5001A 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. Figure 3. SCP Circuit 4 Submit Documentation Feedback Copyright © 2005–2009, Texas Instruments Incorporated Product Folder Link(s): TL5001A-Q1 |
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