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MP2234S Datasheet(PDF) 11 Page - Monolithic Power Systems |
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MP2234S Datasheet(HTML) 11 Page - Monolithic Power Systems |
11 / 19 page MP2234S – SYNCHRONOUS STEP-DOWN CONVERTER MP2234S Rev.1.0 www.MonolithicPower.com 11 4/3/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. OPERATION The MP2234S is a high-frequency, synchronous, rectified, step-down, switch-mode converter with built-in power MOSFETs. It offers a compact solution that achieves a 2A continuous output current with excellent load and line regulation over 4.5V to 16V input- supply range. The MP2234S has three working modes: advanced asynchronous modulation (AAM) mode, discontinuous conduction mode (DCM), and continuous conduction mode (CCM). The load current increases as the device transitions from AAM mode to DCM to CCM. AAM Control Operation In a light-load condition, MP2234S works in advanced asynchronous modulation (AAM) mode (see Figure 2). The VAAM is an internal fixed voltage when input and output voltages are fixed. VCOMP is the error-amplifier output (which represents the peak inductor-current information). When VCOMP is lower than VAAM, the internal clock is blocked. This causes the MP2234S to skip pulses, achieving the light- load power save. Refer to AN032 for additional details. The internal clock re-sets every time VCOMP is higher than VAAM. At the same time, the high- side MOSFET (HS-FET) turns on and remains on until VILsense reaches the value set by VCOMP. The light-load feature in this device is optimized for 12V input applications. Figure 2. Simplified AAM Control Logic DCM Control Operation The VCOMP voltage ramps up as the output current increases. When its minimum value exceeds VAAM, the device enters discontinuous conduction mode (DCM). In DCM, the internal clock initiates the PWM cycle, the HS-FET turns on and remains on until VILsense reaches the value set by VCOMP (after a period of dead time), and the low-side MOSFET (LS-FET) turns on and remains on until the inductor-current value decreases to zero. The device repeats the same operation in every clock cycle to regulate the output voltage (see Figure 3). IL Figure 3. DCM Control Operation CCM Control Operation The device enters continuous conduction mode (CCM) from DCM once the inductor current no longer drops to zero in a clock cycle. In CCM, the internal clock initiates the PWM cycle, the HS-FET turns on and remains on until VILsense reaches the value set by VCOMP (after a period of dead time), and the LS-FET turns on and remains on until the next clock cycle begins. The device repeats the same operation in every clock cycle to regulate the output voltage. If VILsense does not reach the value set by VCOMP within 92% of one PWM period, the HS-FET is forced off. Internal Regulator A 5V internal regulator powers most of the internal circuitries. This regulator takes VIN and operates in the full VIN range. When VIN exceeds 5.0V, the output of the regulator is in full regulation. When VIN is less than 5.0V, the output decreases, and the part requires a 0.1µF ceramic decoupling capacitor. Error Amplifier (EA) The error amplifier compares the FB pin voltage to the internal 0.804V reference (VREF) and outputs a current proportional to the difference between the two. This output current then charges or discharges the internal compensation network to form the COMP voltage, which controls the power MOSFET current. The optimized internal compensation |
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