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MP2364DF Datasheet(PDF) 8 Page - Monolithic Power Systems |
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MP2364DF Datasheet(HTML) 8 Page - Monolithic Power Systems |
8 / 12 page MP2364 — DUAL 1.5A, 23V, 1.4MHz STEP-DOWN CONVERTER MP2364 Rev. 1.4 www.MonolithicPower.com 8 3/22/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM For simplification, choose the input capacitor whose RMS current rating greater than half of the maximum load current. The input capacitor can be electrolytic, tantalum or ceramic. When using electrolytic or tantalum capacitors, a small, high quality ceramic capacitor, i.e. 0.1µF, should be placed as close to the IC as possible. When using ceramic capacitors, make sure that they have enough capacitance to provide sufficient charge prevent excessive voltage ripple at input. The input voltage ripple caused by capacitance can be estimated by: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × × = ∆ IN OUT IN OUT LOAD IN V V 1 V V 1 C I V Output Capacitor The output capacitor is required to maintain the DC output voltage. Ceramic, tantalum, or low ESR electrolytic capacitors are recommended. Low ESR capacitors are preferred to keep the output voltage ripple low. The output voltage ripple can be estimated by: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × × + × ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × × = ∆ 2 C f 8 1 R V V 1 1 L f V V S ESR IN OUT S OUT OUT Where L1 is the inductor value, C2 is the output capacitance value, and RESR is the equivalent series resistance (ESR) value of the output capacitor. In the case of ceramic capacitors, the impedance at the switching frequency is dominated by the capacitance. The output voltage ripple is mainly caused by the capacitance. For simplification, the output voltage ripple can be estimated by: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × × × × = IN OUT 2 S OUT OUT V V 1 2 C 1 L f 8 V ∆V In the case of tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple can be approximated to: ESR IN OUT S OUT OUT R V V 1 1 L f V ∆V × ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − × × = The characteristics of the output capacitor also affect the stability of the regulation system. The MP2364 can be optimized for a wide range of capacitance and ESR values. Compensation Components The MP2364 employs current mode control on each channel for easy compensation and fast transient response. The system stability and transient response are controlled through the COMP pin. COMP pin is the output of the internal transconductance error amplifier. A series capacitor-resistor combination sets a pole-zero combination to control the characteristics of the control system. The DC gain of the voltage feedback loop is given by: OUT FB VEA CS LOAD VDC V V A G R A × × × = Where AVEA is the error amplifier voltage gain, GCS is the current sense transconductance and RLOAD is the load resistor value. The system has two poles of importance. One is due to the compensation capacitor (C3) and the output resistor of error amplifier, and the other is due to the output capacitor and the load resistor. These poles are located at: VEA EA 1 P A 3 C 2 G f × × π = LOAD 2 P R 2 C 2 1 f × × π = Where GEA is the error amplifier transconductance. The system has one zero of importance, due to the compensation capacitor (C3) and the compensation resistor (R3). This zero is located at: 3 R 3 C 2 1 f 1 Z × × π = The system may have another zero of importance, if the output capacitor has a large capacitance and/or a high ESR value. The zero, due to the ESR and capacitance of the output capacitor, is located at: |
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