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EL7562CU-T13 Datasheet(PDF) 7 Page - Intersil Corporation |
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EL7562CU-T13 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 9 page 7 Block Diagram Applications Information Circuit Description General The EL7562 is a fixed frequency, current mode controlled DC-DC converter with integrated N-channel power MOSFETs and a high precision reference. The device incorporates all the active circuitry required to implement a cost effective, user-programmable 2A synchronous step- down regulator suitable for use in DSP core power supplies. Theory of Operation The EL7562 is composed of 5 major blocks: 1. PWM Controller 2. NMOS Power FETs and Drive Circuitry 3. Bandgap Reference 4. Oscillator 5. Thermal Shut-down PWM Controller The EL7562 regulates output voltage through the use of current-mode controlled pulse width modulation. The three main elements in a PWM controller are the feedback loop and reference, a pulse width modulator whose duty cycle is controlled by the feedback error signal, and a filter which averages the logic level modulator output. In a step-down (buck) converter, the feedback loop forces the time- averaged output of the modulator to equal the desired output voltage. Unlike pure voltage-mode control systems, current- mode control utilizes dual feedback loops to provide both output voltage and inductor current information to the controller. The voltage loop minimizes DC and transient errors in the output voltage by adjusting the PWM duty-cycle in response to changes in line or load conditions. Since the output voltage is equal to the time-averaged of the modulator output, the relatively large LC time constant found in power supply applications generally results in low bandwidth and poor transient response. By directly monitoring changes in inductor current via a series sense resistor the controller's response time is not entirely limited by the output LC filter and can react more quickly to changes in line and load conditions. This feed-forward characteristic also simplifies AC loop compensation since it adds a zero to the overall loop response. Through proper selection of the current- feedback to voltage-feedback ratio the overall loop response Drivers PWM Controlle Current Sense Junction Temperature Voltage Reference Oscillator 0.1µF 39 Ω Controller Supply SGND Power Power FET FET 270pF 0.1µF 0.1µF 4.7µH VOUT 2370 Ω 1k Ω 100µF VREF COSC VHI VIN PGND VDD VDRV FB EN 5V |
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