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L6911ETR Datasheet(PDF) 10 Page - STMicroelectronics |
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L6911ETR Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 34 page Device description L6911E 10/34 5 Device description The device is an integrated circuit realized in BCD technology. It provides complete control logic and protections for a high performance step-down DC-DC converter optimized for microprocessor power supply. It is designed to drive N Channel Mosfets in a synchronous- rectified buck topology. The device works properly with Vcc ranging from 5V to 12V and regulates the output voltage starting from a 1.26V power stage supply voltage (Vin). The output voltage of the converter can be precisely regulated, programming the VID pins, from 1.050V to 1.825V with 25mV binary steps, with a maximum tolerance of ±1% over temperature and line voltage variations. The device provides voltage-mode control with fast transient response. It includes a 200kHz free-running oscillator that is adjustable from 50kHz to 1MHz. The error amplifier features a 15MHz gain-bandwidth product and 10V/ms slew rate which permits high converter bandwidth for fast transient performance. The resulting PWM duty cycle ranges from 0% to 100%. The device protects against over- current conditions entering in HICCUP mode. The device monitors the current by using the rds(ON) of the upper MOSFET which eliminates the need for a current sensing resistor. The device is available in SO20 package. 5.1 Oscillator The switching frequency is internally fixed to 200kHz. The internal oscillator generates the triangular waveform for the PWM charging and discharging with a constant current an internal capacitor. The current delivered to the oscillator is tipically 50 µA (F SW = 200KHz) and may be varied using an external resistor (RT) connected between RT pin and GND or VCC. Since the RT pin is maintained at fixed voltage (typ. 1.235V), the frequency is varied proportionally to the current sinked (forced) from (into) the pin. In particular connecting it to GND the frequency is increased (current is sinked from the pin), according to the following relationship: Equation 1 f S 200kHz 4.94 10 6 ⋅ R T kΩ () ------------------------- + = |
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