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SK23 Datasheet(PDF) 8 Page - Monolithic Power Systems |
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SK23 Datasheet(HTML) 8 Page - Monolithic Power Systems |
8 / 10 page MP1580 – 2A, 380KHz STEP-DOWN CONVERTER MP1580 Rev. 3.0 www.MonolithicPower.com 8 12/5/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. TM Determine if the second compensation capacitor, C6, is required. It is required if the ESR zero of the output capacitor happens at less than four times the crossover frequency. Or: 1 f R 2 C 8 C ESR ≥ × × × π or 1 V R 3 R 10 34 . 7 OUT ESR 5 ≥ × × × − If this is the case, add the second compensation capacitor. Determine the value by the equation: 3 R R 2 C 6 C ) MAX ( ESR × = Where RESR(MAX) is the maximum ESR of the output capacitor. For example: VOUT = 3.3V C2= 22µF Ceramic (ESR = 10mΩ) Ω = × × × × ≈ − k 9 . 9 ) 3 . 3 ( ) 10 22 ( ) 10 37 . 1 ( 3 R 6 8 Use the nearest standard value of 10kΩ. nF 6 . 1 10 10 3 . 3 ) 10 22 ( 22 . 0 3 C 3 6 = × × × × > − Use a standard value of 2nF 014 . 0 f R 2 C 2 C ESR = × × × π which is less than 1, therefore no second compensation capacitor is required. Table 5—Recommended Components for Standard Output Voltages VOUT R1 L1 Minimum 1.22V 0Ω 6.8µH 1.5V 2.32kΩ 6.8µH 1.8V 4.75kΩ 10µH 2.5V 10.5kΩ 10µH 3.3V 16.9kΩ 15µH 5.0V 30.9kΩ 22µH Negative Output Voltage The MP1580 can be configured as a buck- boost regulator to supply negative output voltage. Because the GND pin of the IC is now connected to the negative output voltage, the maximum allowable input voltage is the IC input voltage rating (25V) minus the negative output voltage value. A typical application circuit is shown in Figure 3. External Bootstrap Diode It is recommended that an external bootstrap diode be added when the system has a 5V fixed input or the power supply generates a 5V output. This helps improve the efficiency of the regulator. The bootstrap diode can be a low cost one such as IN4148 or BAT54. MP1580 SW BS 10nF 5V MP1580_F02 Figure 2—External Bootstrap Diode This diode is also recommended for high duty cycle operation (when IN OUT V V >65%) and high output voltage (VOUT>12V) applications. |
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