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TL5001-S08-R 데이터시트(PDF) 6 Page - Unisonic Technologies |
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TL5001-S08-R 데이터시트(HTML) 6 Page - Unisonic Technologies |
6 / 13 page TL5001 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 6 of 13 www.unisonic.com.tw QW-R103-016,B DETAILED DESCRIPTION VOLTAGE REFERENCE A 2.5-V regulator operating from Vcc is used to power the internal circuitry of the TL5001 and as a reference for the error amplifier and SCP circuit. A resistive divider provides a 1-V reference for the error amplifier non-inverting input which typically is within 2% of nominal over the operating temperature range. ERROR AMPLIFIER The error amplifier compares a sample of the dc-to-dc converter output voltage to the 1-V reference and generates an error signal for the PWM comparator. The dc-to-dc converter output voltage is set by selecting the error –amplifier gain (see Figure 1), using the following expression. VOUT=(1+R1/R2) (1V) + - FB COMP GND VI(FB) R1 R2 VREF=1V To PWM Comparator Compensation Network 3 4 8 Figure 1.Error-Amplifier Gain Setting The error-amplifier output is brought out as COMP for use in compensating the dc-to-dc converter control loop for stability. Because the amplifier can only source 45µA, the total dc load resistance should be 100kΩ or more. OSCILLATOR/PWM The oscillator frequency (fosc) can be set between 20kHz and 500kHz by connecting a resistor between RT and GND .Acceptable resistor values range from 15 kΩ to 250 kΩ. The oscillator frequency can be determined by using the graph shown in Figure 5. The oscillator output is a triangular wave with a minimum value of approximately 0.7V and a maximum value of approximately 1.3V. The PWM comparator compares the error-amplifier output voltage and the DTC input voltage to the triangular wave and turns the output transistor off whenever the triangular wave is greater than the lesser of the two inputs. |
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