Ap2004 Buck Controller

The AP2004 integrates Pulse-Width-Modulation (PWM) control circuit into a single chip, mainly designed for power-supply Regulator All the functions include an on-chip 1.25V reference output, an adjustable Oscillator UVLO, SCP, soft-start circuitry, and a push-pull output circuit. Switching frequency is adjustable by trimming the CT. During low VCC situation, the UVLO makes sure that the outputs are off until the internal circuit is operating normally. 2.2 Typical Application The AP2004 may operate in either the CCM (Continuous Conduction Mode) or the DCM (Discontinuous Conduction Mode). The following applications are designed for CCM operation. That is, the inductor current is not allowed to fall to zero. To compare the disadvantages and advantages for CCM and DCM, the main disadvantage of CCM is the inherent stability problems (caused by the right-half-plane zero and the double pole in the small-signal control to output voltage transfer function). However, the main disadvantage of DCM is that peak currents of Switch and Diode are larger than CCM when converting. Using a power Switch and output Diode with larger current and power dissipation ratings should solve this issue of large peak currents. The designer has to use larger output capacitors, and take more effort on EMI RFI solution too. The designer could make a choice for each mode. For a light load, DCM is preferred for a buck frame, but for a heavy load, CCM is preferred.
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Ap2004 Buck Controller application circuits
Ap2004 Buck Controller application circuits

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