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TL5001L-D08-T Datasheet(PDF) 7 Page - Unisonic Technologies |
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TL5001L-D08-T Datasheet(HTML) 7 Page - Unisonic Technologies |
7 / 13 page TL5001 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 7 of 13 www.unisonic.com.tw QW-R103-016,B DETAILED DESCRIPTION(Cont.) DEAD TIME CONTORL (DTC) DTC provides a means of limiting the output-switch duty cycle to a value less than 100%, which is critical for boost and flyback converters. A current source generates a reference current (IDT) at DTC that is nominally equal to the current at the oscillator timing terminal, RT. Connecting a resistor between DTC and GND generates a dead-time reference voltage (VDT), which the PWM/DTC comparator compares to the oscillator triangle wave as described in the previous section. Nominally, the maximum duty cycle is 0% when VDT is 0.7V or less and 100% when VDT is 1.3V or greater. Because the triangle wave amplitude is a function of frequency and the source impedance of RT is relatively high(1250Ω),choosing RDT for a specific maximum duty cycle, D, is accomplished using the following equation and the voltage limits for the frequency in question as found in Figure 11(Voscmax and Voscmin are the maximum and minimum oscillator levels): RDT=(Rt +1250)[D(Vosc max-Vosc min)+Vosc min] 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: VDT≈IDTRDT(1-e (-t/RDTCDT)) UTC TL5001 RDT CDT DTC 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 UTC TL5001 remains off unit VDT≈0.7V, 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 3V at 25℃) for proper operation. A hysteresis voltage of 200mV eliminates false triggering on noise and chattering. |
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