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FP6711 Datasheet(PDF) 9 Page - Fitipower Integrated Technology Inc. |
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FP6711 Datasheet(HTML) 9 Page - Fitipower Integrated Technology Inc. |
9 / 13 page ![]() 9 FP6711-1.4-DEC-2011 FP6711 85T fitipower integrated technology lnc. Application Information Controller Circuit The device is based on a current-mode control topology and uses a constant frequency pulse-width modulator to regulate the output voltage. The controller limits the current through the power switch on a pulse by pulse basis. The current sensing circuit is integrated in the device; therefore, no additional components are required. Due to the nature of the boost converter topology used here, the peak switch current is the same as the peak inductor current, which will be limited by the integrated current limiting circuits under normal operating conditions. The control loop must be externally compensated with an R-C network connected to the COMP pin. Synchronous Rectifier The device integrates an N-channel and a P- channel MOSFET transistor to realize a synchronous rectifier. There is no additional Schottky diode required. Because the device uses a integrated low RDS(ON) PMOS switch for rectification, the power conversion efficiency reaches 94%. A special circuit is applied to disconnect the load from the input during shutdown of the converter. In conventional synchronous rectifier circuits, the backgate diode of the high-side PMOS is forward biased in shutdown and allows current flowing from the battery to the output. This device, however, uses a special circuit to disconnect the backgate diode of the high-side PMOS and so, disconnects the output circuitry from the source when the regulator is not enabled (EN = low). PFM Mode The FP6711 is designed for high efficiency over a wide output current range. Even at light load, the efficiency stays high because the switching losses of the converter are minimized by effectively reducing the switching frequency. The controller will enter a power saving mode if certain conditions are met. In this mode, the controller only switches on the transistor if the output voltage trips below a set threshold voltage. It ramps up the output voltage with one or several pulses, and goes again into PFM mode once the output voltage exceeds a set threshold voltage. Device Enable The device will be shut down when EN is set to GND. In this mode, the regulator stops switching, all internal control circuitry including the low-battery comparator will be switched off, and the load is disconnected from the input (as described in above synchronous rectifier section). This also means that the output voltage may drop below the input voltage during shutdown. The device is put into operation when EN is set high. During start-up of the converter, the duty cycle is limited in order to avoid high peak currents drawn from the battery. The limit is set internally by the current limit circuit and is proportional to the voltage on the COMP pin. Under-Voltage Lockout Under-voltage lockout function prevents the device from starting up if the supply voltage on VBAT is lower than approximately 0.7V. This under-voltage lockout function is implemented in order to prevent the malfunctioning of the converter. When the battery is being discharged, the device will automatically enter the shutdown mode if the voltage on VBAT drops below approximately 0.7V. |
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