Power Management The UCC28061DR contains two Pulse Width Modulation (PWM) power converter control circuits. The boost PWM power converter ramps the current in the boost inductor for a period of time proportional to the voltage on the boost error amplifier output. Each power converter then turns off the power MOSFET until the current is boosted on the zero current sense inputs (ZCDA and ZCDB) and the inductance decays to 0. Power management UCC28061DR once the inductor

The current decays to 0 and the power converter begins another cycle. This on/off cycle produces a triangular wave

Current, peak current is set by timing and power input voltage, power management UCC28061DR

The average line current is exactly half the peak line current, power management UCC28061DR

When t and L are substantially constant over the AC line cycle, the resulting triangular current waveform

In each switching cycle, there is an average value proportional to the instantaneous value of the rectified AC line

Voltage. This structure operates at line frequency and a

near-unity power factor.

The outputs of the two PWMs are 180° out of phase, so that the power line ripple current of the two PWMs is

Greatly reduces the ripple current from each individual PWM. This design reduces ripple current at the input

and output, allowing input and output filters to reduce size and cost.

Optimal phase balance occurs if the individual power stages and on-time are well matched. Unmatch

The inductance value does not affect the phase relationship.

The punctuality of the gate drive varies with the output voltage of the error amplifier, KT, as shown in Equation 3.

Location: VCOMP is the output of the error amplifier and 125 mV is the offset of the modulator.

For a smooth transition between two-phase and single-phase operation, KT is doubled for single-phase mode: ?KTLS = 2×KTL; single-phase operation is proactive

The maximum output of the error amplifier is limited to 4.95 V. This value, minus the 125 mV modulator offset, limits the time to Equation 4.

This time limit sets the maximum power that the converter can deliver at a given input voltage level.

The switching frequency of each phase is limited by the minimum period timer. if the current value is in. Decayed to 0 before

The minimum period timer expires, delaying the start-up, resulting in discontinuous phase currents.

Restart timer ensures start in any case, if one of the stages ZCD enters, restarts both stages

does not transition to low for about 200µs. Prevent the circuit from working continuously

Conduction mode (CCM), the restart time is only triggered when the two-phase current is 0.

Under normal operating conditions, the UCC28061 regulates the relative phase of channel A and channel B

Shenzhen Tianzhuo Weiye Electronics Co., Ltd.

In the past 10 years, Shenzhen Tianzhuo Weiye Electronics Co., Ltd. has seized the historical opportunities brought by China's reform and opening up and the rapid development of the electronics industry, adhered to customer-centricity and high-quality products as the foundation, and provided customers with one-stop procurement services for components. Won the respect and trust of customers, from an entrepreneurial company based in Huaqiangbei, Shenzhen Special Economic Zone, China, it has grown steadily into an electronic component supplier with several well-known brand product lines and customers in many countries and regions around the world. The electronic IC and 3C distributed and wholesaled sell well in the consumer market and enjoy a high status among consumers. The company has established long-term and stable cooperative relations with many retailers and agents.