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FAN5665UCX Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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FAN5665UCX Datasheet(HTML) 11 Page - Fairchild Semiconductor |
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11 / 15 page  © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5665 • Rev. 1.0.1 11 Block Diagram Figure 39. Block Diagram Functional Description Overview FAN5665 is a 5V switched capacitor regulator with very low output ripple and high efficiency. The maximum output current is 30mA. Linear Regulation Loop The linear regulation loop (consisting of the power transistors, output feedback, and error amplifier), is used to regulate the output voltage and reduce current spikes at mode change. Soft-start At power-up, the device has 0.5ms soft-start to control the inrush current and make the output ramp up slowly. Modes of Operation FAN5665 has 1×, 1.5×, and 2× modes. Input voltage is compared with reference to determine mode. Light / Heavy Load Monitor In 1.5× / 2× mode, there is a current sense to detect the output current. If a light-load condition is detected, the device switches to a lower switching frequency around 50kHz. This frequency is a good compromise between achieving high light-load efficiency and not causing audible noise generation. If the load is heavy (typically more than 5mA), the device switches at 1.2MHz to decrease the output voltage ripple. Protection FAN5665 has thermal shutdown protection when the die temperature is more than 150°C. It turns back off when the temperature falls by about 10°C. Short-circuit protection helps avoid damage to the device when the output is shorted to ground. Whenever output voltage is pulled below 150mV, short-circuit protection is triggered and limits the input current. If VOUT>150mV, protection is in the form of thermal shutdown if die temperature exceeds 150°C. |
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