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L7986 Arkusz danych(PDF) 8 Page - STMicroelectronics |
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L7986 Arkusz danych(HTML) 8 Page - STMicroelectronics |
8 / 43 page Functional description L7986 8/43 DocID022450 Rev 6 5 Functional description The L7986 device is based on a “voltage mode”, constant frequency control. The output voltage VOUT is sensed by the feedback pin (FB) compared to an internal reference (0.6 V) providing an error signal that, compared to a fixed frequency sawtooth, controls the on- and off-time of the power switch. The main internal blocks are shown in the block diagram in Figure 3. They are: A fully integrated oscillator that provides sawtooth to modulate the duty cycle and the synchronization signal. Its switching frequency can be adjusted by an external resistor. The voltage and frequency feed-forward are implemented. The soft-start circuitry to limit inrush current during the startup phase. The voltage mode error amplifier. The pulse width modulator and the relative logic circuitry necessary to drive the internal power switch. The high-side driver for embedded P-channel power MOSFET switch. The peak current limit sensing block, to handle overload and short-circuit conditions. A voltage regulator and internal reference. To supply the internal circuitry and provide a fixed internal reference. A voltage monitor circuitry (UVLO) that checks the input and internal voltages. A thermal shutdown block, to prevent thermal runaway. Figure 3. Block diagram PEAK CURRENT LIMIT OSCILLATOR S R Q THERMAL SHUTDOWN SOFT- START EN TRIMMING UVLO 0.6V REGULATOR & BANDGAP 1.254V 3.3V SYNCH & PHASE SHIFT EN FB COMP FSW GND SYNCH OUT VCC DRIVER E/A PWM PEAK CURRENT LIMIT OSCILLATOR S R Q THERMAL SHUTDOWN SOFT- START EN TRIMMING UVLO UVLO 0.6V REGULATOR & BANDGAP REGULATOR & BANDGAP 1.254V 3.3V SYNCH & PHASE SHIFT EN FB COMP FSW GND SYNCH OUT VCC DRIVER E/A PWM |
Podobny numer części - L7986 |
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Podobny opis - L7986 |
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