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CS5111 Datasheet(PDF) 7 Page - ON Semiconductor |
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CS5111 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 16 page CS5111 http://onsemi.com 7 Figure 8. Timing Diagram When WDI Fails to Appear Within the Preset Time Interval, tWDI RESET VREG WDI VLIN tPOR AB 50% Duty Cycle A: Watchdog waiting for low–going transition on WDI B: RESET stays low for tWDI time The RESET signal frequency is given by: fRESET + 1 2(tWDI) The Power On Reset (POR) and low voltage RESET use the same circuitry and issue a reset when the linear output voltage is below the regulation limit. After VLIN rises above the minimum specified value, RESET remains low for a fixed period tPOR as shown in Figures 9 and 10. Figure 9. The Power On Reset Time Interval (tPOR) Begins When VLIN Rises Above 4.45 V (Typical) RESET VLIN tPOR 4.45 V 4.25 V VR(PEAK) VR(LO) Figure 10. RESET Signal Is Issued Whenever VLIN Falls Below 4.25 V (Typical) tPOR RESET 5.0 V 5.0 V 4.25 V VLIN The POR delay (tPOR) is given by: tPOR + 1.353 CDelayRBIAS CURRENT MODE PWM SWITCHING CIRCUITRY The current mode PWM switching voltage regulator contains an error amplifier with selectable feedback inputs, a current sense amplifier, an adjustable oscillator and a 1.4 A output power switch with antisaturation control. The switching regulator and external components, connected in a boost configuration, are shown in Figure 11. The switching regulator begins operation when VREG and VIN are raised above 5 volts. VREG is required since the switching supply’s control circuitry is powered through VLIN. VIN supplies the base drive to the switcher output transistor. The output transistor turns on when the oscillator starts to charge the capacitor on COSC. The output current will develop a voltage drop across the internal sense resistor (RS). This voltage drop produces a proportional voltage at the output of the current sense amplifier, which is compared to the output of the error amplifier. The error amplifier generates an output voltage which is proportional to the difference between the scaled down output boost voltage (VFB1 or VFB2) and the internal bandgap voltage reference. Once the current sense amplifier output exceeds the error amplifier’s output voltage, the output transistor is turned off. The energy stored in the inductor during the output transistor on time is transferred to the load when the output transistor is turned off. The output transistor is turned back on at the next rising edge of the oscillator. On a cycle by cycle basis, the current mode controller in a discontinuous mode of operation charges the inductor to the appropriate amount of energy, based on the energy demand of the load. Figure 12 shows the typical current and voltage waveforms for a boost supply operating in the discontinuous mode. Notes: 1. Refer to Figure 5 to determine oscillator frequency. 2. The switching regulator can be disabled by providing a logic high at the ENABLE input. 3. The boost output voltage can be controlled dynamically by the feedback select input. If select is open, VFB2 is selected. If select is low, then VFB1 is selected. |
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