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FAN5602MP45X データシート(PDF) 10 Page - Fairchild Semiconductor |
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FAN5602MP45X データシート(HTML) 10 Page - Fairchild Semiconductor |
10 / 16 page 10 REV. 1.1 10/7/04 FAN5602 PRODUCT SPECIFICATION Block Diagram BAND GAP SOFT START CURRENT SENSE PFM MODE SC UVLO OSCILLATOR VIN VOUT DRIVER EN Light load FB FB BG BG REF VIN 150mV VOUT 1.6V VIN EN ERROR AMP VIN GND C1+ C1- C2+ C2- VOUT ENABLE S W I T C H A R R A Y Functional Description FAN5602 is a high efficiency and low noise switched-capac- itor DC/DC converter and is capable of both step-up and step-down operations. It has seven built-in switch configura- tions. Based on the ratio of the input voltage to the output voltage the FAN5602 automatically reconfigures the switches to achieve the highest efficiency. The regulation of the output is achieved by a linear regulation loop, which modulates the on-resistance of the power transistors so that the amount of charge transferred from the input to the flying capacitor at each clock cycle is controlled and is equal to the charge needed by the load. The current spike is reduced to minimum. At light load the FAN5602 automatically switches to PFM mode to save power. The regulation at PFM mode is achieved by skipping pulses. Linear Regulation Loop The FAN5602 operates at constant frequency at load higher than 10mA. The linear regulation loop consisting of power transistors, feedback (resistor divider) and error amplifier is used to realize the regulation of the output voltage and to reduce the current spike. The error amplifier takes feedback and reference as inputs and generates the error voltage sig- nal. The error voltage signal is then used as the gate voltage of the power transistor and modulates the on-resistance of the power transistor and therefore the charge transferred from the input to the output is controlled and the regulation of the output is realized. Since the charge transfer is con- trolled, the FAN5602 has small ESR spike. |
同様の部品番号 - FAN5602MP45X |
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同様の説明 - FAN5602MP45X |
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