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FAN5632MPX Datasheet(PDF) 9 Page - Fairchild Semiconductor |
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FAN5632MPX Datasheet(HTML) 9 Page - Fairchild Semiconductor |
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9 / 13 page  © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5631/FAN5632 Rev. 1.0.2 9 Switch Configuration S1 S2 S3 S4 V IN GND C+ V OUT C- C OUT 2:1 configuration Switches in charging phase Reverse all switches for pumping phase C B S1 S3 S4 V IN GND C+ VOUT C- C OUT 1:1 configuration Switch 3 is always off Switch 4 is always on Switches 1 and 2 are in phase 1 Reverse position of switches 1&2 for phase 2 C B S2 Figure 15. 2:1 Configuration Figure 16. 1:1 Configuration Shutdown, UVLO, Short-Circuit, Current-Limit and Thermal Shutdown The device has an active-low shutdown pin to decrease supply current to less than 1 μA. In shutdown mode, the supply is disconnected from the output. UVLO triggers when supply voltage drops below 2V. When the output voltage is lower than 150mV, a short-circuit protection is triggered. In this mode, 15 out of 16 pulses during the switching are skipped and the supply current is limited. Thermal shutdown triggers at 150ºC. Efficiency Optimizer (FAN5632) In the FAN5632, VSEL can be tied to ground to enable the efficiency optimizer feature. To achieve an optimized efficiency, the switch mode configuration transition point is shifted from a 2:1 to a 1:1 mode until the output voltage falls to 20% of its nominal value. For example, when the nominal output voltage is 1.5V, the output voltage is allowed to drop to 1.2V. This maintains a peak efficiency of 85% for the input voltage range of 2.9V to 3.5V. For normal operation, tie VSEL high. |
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