Datasheet MP1542 (Monolithic Power Systems) - 6
| 制造商 | Monolithic Power Systems |
| 描述 | 700KHz/1.3MHz Boost Converter with a 2A Switch |
| 页数 / 页 | 11 / 6 — MP1542 – 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH. PIN FUNCTIONS. … |
| 文件格式/大小 | PDF / 351 Kb |
| 文件语言 | 英语 |
MP1542 – 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH. PIN FUNCTIONS. Pin # Name Description. OPERATION
该数据表的模型线
文件文字版本
MP1542 – 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH PIN FUNCTIONS Pin # Name Description
1 COMP Compensation Pin. Connect a capacitor and resistor in series to ground for loop stability. 2 FB Feedback Input. Reference voltage is 1.25V. Connect a resistor divider to this pin. Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns 3 EN it off. When not used, connect EN to the input source (through a 100kΩ pull-up resistor if VIN > 6V) for automatic startup. EN cannot be left floating. 4 GND Ground. Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power 5 SW inductor and output rectifier to SW. SW can swing between GND and 25V. 6 IN Input Supply Pin. IN must be locally bypassed. Frequency Select Pin. Tie to IN (through a 100kΩ resistor if V 7 FSEL IN > 6V) for 1.3MHz operation or to GND for 700kHz operation. Soft-Start Control Pin. Connect a soft-start capacitor to this pin. The soft-start capacitor is 8 SS charged with a constant current of 6μA.
OPERATION
The MP1542 uses a constant frequency, peak The operation of the MP1542 can be current mode boost regulation architecture to understood by referring to the block diagram of regulate the feedback voltage. Figure 1. IN 6 INTERNAL REGULATOR EN 3 AND ENABLE CIRCUITRY FSEL 7 OSCILLATOR 5 SW + PWM CONTROL LOGIC -- CURRENT SENSE + AMP -- 4 GND -- 2 FB GM + SS 1.25V 8 1 COMP
Figure 1—Function Block Diagram
MP1542 Rev. 1.5 www.MonolithicPower.com
6
6/22/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.
1 COMP Compensation Pin. Connect a capacitor and resistor in series to ground for loop stability. 2 FB Feedback Input. Reference voltage is 1.25V. Connect a resistor divider to this pin. Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns 3 EN it off. When not used, connect EN to the input source (through a 100kΩ pull-up resistor if VIN > 6V) for automatic startup. EN cannot be left floating. 4 GND Ground. Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power 5 SW inductor and output rectifier to SW. SW can swing between GND and 25V. 6 IN Input Supply Pin. IN must be locally bypassed. Frequency Select Pin. Tie to IN (through a 100kΩ resistor if V 7 FSEL IN > 6V) for 1.3MHz operation or to GND for 700kHz operation. Soft-Start Control Pin. Connect a soft-start capacitor to this pin. The soft-start capacitor is 8 SS charged with a constant current of 6μA.
OPERATION
The MP1542 uses a constant frequency, peak The operation of the MP1542 can be current mode boost regulation architecture to understood by referring to the block diagram of regulate the feedback voltage. Figure 1. IN 6 INTERNAL REGULATOR EN 3 AND ENABLE CIRCUITRY FSEL 7 OSCILLATOR 5 SW + PWM CONTROL LOGIC -- CURRENT SENSE + AMP -- 4 GND -- 2 FB GM + SS 1.25V 8 1 COMP
Figure 1—Function Block Diagram
MP1542 Rev. 1.5 www.MonolithicPower.com
6
6/22/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved.