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EP3101 Datasheet(PDF) 11 Page - Eorex Corporation |
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EP3101 Datasheet(HTML) 11 Page - Eorex Corporation |
11 / 13 page eorex EP3101 Jul. 2006 www.eorex.com 11/13 Delayed Startup The circuit in Figure 1 uses the EN pin to provide a time delay between the time the input voltage is applied and the time the output voltage comes up (only the circuitry pertaining to the delayed start up is shown). As the input voltage rises, the charging of capacitor C1 pulls the EN pin high, keeping the regulator off. Once the input voltage reaches its final value and the capacitor stops charging, and resistor R2 pulls the EN pin low, thus allowing the circuit to start switching. Resistor R1 is included to limit the maximum voltage applied to the EN pin (maximum of 25V), reduces power supply noise sensitivity, and also limits the capacitor, C1, discharge current. When high input ripple voltage exists, avoid long delay time, because this ripple can be coupled into the EN pin and cause problems. This delayed startup feature is useful in situations where the input power source is limited in the amount of current it can deliver. It allows the input voltage to rise to a higher voltage before the regulator starts operating. Buck regulators require less input current at higher input voltages. VIN GND CIN EN EP3101 680uF 1 53 + C1 0.1uF R2 47K +VIN R1 47K Figure 1-Delayed Startup |
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