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MP2317 Datasheet(PDF) 10 Page - Monolithic Power Systems |
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MP2317 Datasheet(HTML) 10 Page - Monolithic Power Systems |
10 / 16 page MP2317 – 26V, 1A, SYNCHRONOUS, STEP-DOWN CONVERTER MP2317 Rev. 1.0 www.MonolithicPower.com 10 3/24/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. OPERATION The MP2317 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with built-in, internal power MOSFETs. It offers a very compact solution that achieves 1A of continuous output current with excellent load and line regulation over a wide input supply range. The MP2317 operates in a fixed-frequency, peak-current-control mode to regulate the output voltage. A pulse width modulation (PWM) cycle is initiated by the internal clock. The integrated high-side power MOSFET (HS- FET) turns on and remains on until its current reaches the value set by the COMP voltage (VCOMP). When the power switch is off, it remains off until the next clock cycle begins. If the current in the power MOSFET does not reach the current value set by COMP within 93% of one PWM period, the power MOSFET is forced off. Internal VCC Regulator Most of the internal circuitries are powered by the internal VCC regulator. This regulator takes the VIN input and operates in the full VIN range. When VIN is greater than its UVLO rising threshold, the output of the regulator is in full regulation. When VIN is lower than its UVLO falling threshold, the internal VCC regulator shuts off. A 0.1µF ceramic capacitor is required for decoupling. Error Amplifier (EA) The error amplifier compares the FB voltage with the internal 0.791V reference (REF) and outputs a COMP voltage, which is used to control the power MOSFET current. The optimized internal compensation network minimizes the external component counts and simplifies the control loop design. AAM Operation The MP2317 uses advanced asynchronous modulation (AAM) power-save mode for light loads. The AAM voltage is set at 0.4V internally. Under heavy-load conditions, VCOMP is higher than VAAM. When the clock goes high, the HS- FET turns on and remains on until VILsense reaches the value set by VCOMP. The internal clock resets whenever VCOMP is higher than VAAM. Under light-load conditions, the value of VCOMP is low. When VCOMP is less than VAAM, and VFB is less than VREF, VCOMP ramps up until it exceeds VAAM. During this time, the internal clock is blocked, and the MP2317 skips some pulses for pulse frequency modulation (PFM) mode and achieves light-load power save. Figure 2: Simplified AAM Control Logic Under-Voltage Lockout (UVLO) Under-voltage lockout (UVLO) is implemented to protect the chip from operating at an insufficient supply voltage. The UVLO comparator monitors the input voltage. When the input voltage is higher than the UVLO rising threshold, the MP2317 powers up and shuts off when the input voltage is lower than the UVLO falling threshold. It has non-latch protection. Internal Soft Start (SS) The soft start (SS) is implemented to prevent the converter output voltage from overshooting during start-up. When the chip starts up, the internal circuitry generates a soft-start voltage that ramps up from 0V. The soft-start period lasts until the voltage on the soft-start capacitor exceeds the 0.791V reference voltage. At this point, the reference voltage takes over. The soft-start time is set to be around 1.5ms internally from 10% to 90% of VOUT. Over-Current Protection (OCP) and Hiccup The MP2317 employs a cycle-by-cycle over- current limit when the inductor current peak value exceeds the set current-limit threshold. Meanwhile, the output voltage starts to drop until FB is below the under-voltage (UV) threshold, typically 50% below the reference. Once UV is triggered, the MP2317 enters hiccup mode to restart the part periodically. This protection mode is especially useful when the output is dead-shorted to ground. The average short-circuit current is greatly reduced to alleviate thermal issues and to protect the regulator. The MP2317 exits hiccup mode once the over-current condition is removed. |
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Similar Description - MP2317 |
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