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E-L6911E Application Field and Working Principle

The E-L6911E is a high-efficiency DC-DC switching controller with synchronous rectifier specially designed for Notebook\'s traditional non-isolation regulated designs. It belongs to the category of PMICs (Power Management ICs), specifically to the Voltage Regulators subcategory and the DC-DC Switching Controllers.

Application

The E-L6911E is ideal for single polarity, dual output switch mode power supplies applications with the outputs propped up from input system voltages ranging from 3.0V to 36V. It integrates a PWM control Plus Synchronous rectifier for for DC/DC conversion, which is complete enough to build a high efficiency regulated design without an external driver. Its main application field involves automotive, gaming laptops, AC/DC adapters, other portables, communication devices, and also in entire LCD display systems. The unit supports both PWM and PFM control on the primary side with Burst Mode, and PFM control on the secondary side with Burst Mode, allowing for power demand regulation and therefore optimizing the product\'s overall performance.

Working Principle

The E-L6911E combines a two-stage structure of a Pulse Width Modulation controller and a Dual MOSFET synchronous rectifier to design a buck converter with isolated outputs. Different from the normal buck converter without isolated outputs, this solution only requires one control loop and uses the internal feedback for the SLI management. The controller integrate with a dual-MOSFET synchronous rectifier circuit on each output, allowing for very high efficiency properties. The linear current gain is typically 50 mA/V and Gate Drive current is internally limited to 500 mA peak. It will automatically reduce the forward current and disconnect the MOSFET driver during the Low Power Mode (LPM).

This device also provides the user with pulse-width modulation (PWM) control, which is a technique used to permanently fix the frequency and magnitude of the output of power supplies, if compared to varying-amplitude pulse-width modulation. Input voltage and output current are regulated by PWM application circuit, which has several key components, like an oscillator adjusting the PWM switching frequency, a slave latch comparing the signal that current is OK or not, and the output modulator that make the signal able to be driven through an output terminal. With this IC, the current signal is controlled at pulse-by-pulse to maintain a steady power result.

Conclusion

In conclusion, the E-L6911E belongs in the PMIC - Voltage Regulators - DC-DC Switching Controllers category. It is useful for single polarity, dual Output switch mode power supplies applications, such as automotive, gaming laptops, AC/DC adapters, communication devices, portables and LCD display systems. Its major operational principles are the pulse-width modulation and the two-stage structure of a Pulse Width Modulation controller combined with a Dual MOSFET synchronous rectifier. E-L6911E helps to build a high efficiency regulated design with isolated outputs and improved overall efficiency properties.

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