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L6935 Scheda tecnica(PDF) 11 Page - STMicroelectronics |
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L6935 Scheda tecnica(HTML) 11 Page - STMicroelectronics |
11 / 20 page Device description L6935 11/20 5 Device description 5.1 Soft-start L6935 implements a soft-start feature to smoothly charge the output filter avoiding high in- rush currents to be required to the input power supply. The soft-start process begins as soon as VBIAS reaches UVLO and ENABLE is asserted. A constant current ISS = 1.0 µA is sourced through the SS pin: connecting an external capacitor (CSS) to this pin a voltage ramp is implemented; the voltage ramp internally clamps the E.A. reference, resulting in a controlled slope for the output voltage. As the voltage on CSS reaches the VREF value the internal clamp is released. In this way, the soft-start process lasts for: where CSS is the external capacitor [F] and TSS is the soft-start time [sec.]. If the device is disabled (ENABLE low) and the VBIAS is still present, the SS pin is clamped to GND for a fixed time of about 50 µs. in order to discharge the residual charge present on CSS: in this way, the device will be ready for a new SS process as ENABLE is asserted again. Figure 9 describes a typical soft-start process. Figure 9. Soft start process diagram (left) and measured (right) T SS C SS V REF I SS -------------- ⋅ 510 5 C SS F [] ⋅⋅ == ENABLE Vbias ADJ Vout 0.5V >0.7V >1.1V Programmed Vout ~50 µsec Programmed Tss |
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