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EP3001 Datasheet(PDF) 7 Page - Eorex Corporation |
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EP3001 Datasheet(HTML) 7 Page - Eorex Corporation |
7 / 10 page eorex EP3001 Jul. 2006 www.eorex.com 7/10 Idle Mode Operation At very light loads, the EP3001 automatically enters Idle Mode. In the Idle Mode, the inductor current may reach zero or reverse on each pulse. The PWM control loop will automatically skip pulses to maintain output regulation. The bottom MOSFET is turned off by the current reversal comparator, IZERO, and the switch voltage will ring. This is discontinuous mode operation, and is normal behavior for the switching regulator. Dropout Operation When the input voltage decreases toward the value of the output voltage, the EP3001 allows the main switch to remain on for more than one switching cycle and increases the duty cycle (Note 5) until it reaches 100%. The output voltage then is the input voltage minus the voltage drop across the main switch and the inductor. At low input supply voltage, the RDS(ON) of the P-Ch MOSFET increases, and the efficiency of the converter decreases. Caution must be exercised to ensure the heat dissipated not to exceed the maximum junction temperature of the IC. Note 5: The duty cycle D of a step-down converter is defined as: D = TON × fOSC × 100%≈ IN OUT V V × 100% where TON is the main switch on time, and fOSC is the oscillator frequency (1.5MHz). Maximum Load Current The EP3001 will operate with input supply voltage as low as 2.5V, however, the maximum load current decreases at lower input due to large IR drop on the main switch and synchronous rectifier. The slope compensation signal reduces the peak inductor current as a function of the duty cycle to prevent sub-harmonic oscillations at duty cycles greater than 50%. Conversely the current limit increases as the duty cycle decreases. Short-Circuit Protection A current limit (1A) circuit is equipped in the EP3001, to protect the EP3001 when the output pin is shorted to GND pin. This current limit will suppress the output current so that the inductor current has enough time to decay. |
Similar Part No. - EP3001_15 |
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Similar Description - EP3001_15 |
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