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UCD7201PWP Datasheet(PDF) 10 Page - Texas Instruments |
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UCD7201PWP Datasheet(HTML) 10 Page - Texas Instruments |
10 / 20 page www.ti.com Additional Application Circuits Isolation Amplifier COMMUNICATION (Programming & Status Reporting) 14 1 13 8 PVDD VDD CS 10 OUT2 3 4 2 5 6 IN1 AGND 3V3 IN2 CLF 7 UCD7201PWP 11 OUT1 9 PGND 12 NC ILIM NC Bias Supply Bias Winding VIN VOUT DIGITAL CONTROLLER GND PWMA ADC4 INTERRUPT or CCR PWMB ADC3 VCC PWM or GPIO ADC1 ADC2 CS XFMR Gate Drive Transformer (3 winding) 15 16 14 2 4 14 1 13 8 PVDD VDD CS 10 OUT2 3 4 2 5 6 IN1 AGND 3V3 IN2 CLF 7 UCD7201 11 OUT1 9 PGND 12 NC ILIM NC Bias Supply Bias Winding VIN VOUT 13 UCC28089 GND OUTA OUTB VDD DIS CS 3 1 SYNC CT UCD7201 SLUS645B – FEBRUARY 2005 – REVISED JULY 2005 Figure 2 shows the UCD7201 in a half-bridge converter design. The digital controller is performing the output voltage compensation and all supervisory functions. The isolation amplifier is made up of a linear opto-coupler configured for a gain of 1/10, so the output voltage is transformed to a level comparable with the ADC of the digital controller. Figure 2. Half-Bridge Converter Figure 3 shows the UCD7201 in an analog only implementation of an intermediate bus converter. The ILIM pin of the UCD7201 is exponentially increased at start-up, which minimizes overshoot on the output voltage. The UCC28089 is a push-pull controller with fixed dead-time. The UCC28089 operates at a fixed duty cycle close to 100% so the circuit acts like a DC transformer linearly transforming the input voltage via the turns ratio of the transformer. Figure 3. Intermediate Bus Converter 10 |
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