UC3845BN PDF

Статья "Обратноходовой преобразователь", Дмитрия Макашева скачать. Статья "Эволюция обратноходовых импульсных источников питания", С. Косенко скачать. UC имеет два варианта исполнения корпуса 8pin и 14pin, расположение выводов этих исполнений, существенно отличаются. Далее будет рассматриваться только вариант исполнения корпуса 8pin. Упрощенная структурная схема, необходима для понимания принципа работы ШИМ-контроллера.

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Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider. A voltage proportional to inductor current is connected to this input.

The PWM uses this information to terminate the output switch conduction. The oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to Vref and cpacitor CT to ground. Operation to kHz is possible. This pin is the combined control circuitry and power ground. Peak currents up to 1A are sourced and sunk by this pin. This pin is the positive supply of the control IC. This is the reference output.

It provides charging current for capacitor C T through resistor RT. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain Tj as close to Tamb as possible. Gain defined as :? VPIN3 5. Adjust Vi above the start threshold before setting at 15 V. VREF 4. Timing and bypass capacitors should be connected close to pin 5 in a single point ground.

The transistor and 5 K? Figure 2: Timing Resistor vs. Oscillator Frequency RT K? Timing Resistor. Error Amp Output Voltage. C Phase 0. Source Current. Load Current. Supply Voltage. VCC Vin 7 5. The simple two transistor circuit can be used in place of the SCR as shown. All resistors are 10K. Mold flash or potrusions shall not exceed 0.

However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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