поискавой системы для электроныых деталей |
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FAN53611 датащи(PDF) 10 Page - Fairchild Semiconductor |
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FAN53611 датащи(HTML) 10 Page - Fairchild Semiconductor |
10 / 14 page © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN53601 / FAN53611 • Rev. 1.0.1 10 Under-Voltage Lockout (UVLO) When EN is HIGH, the under-voltage lockout keeps the part from operating until the input supply voltage rises high enough to properly operate. This ensures no misbehavior of the regulator during startup or shutdown. Thermal Shutdown (TSD) When the die temperature increases, due to a high load condition and/or a high ambient temperature; the output switching is disabled until the die temperature falls sufficiently. The junction temperature at which the thermal shutdown activates is nominally 150°C with a 15°C hysteresis. Minimum Off-Time Effect on Switching Frequency tOFF(MIN) is 40 ns. This imposes constraints on the maximum IN OUT V V that the FAN53601/11 can provide or the maximum output voltage it can provide at low VIN while maintaining a fixed switching frequency in PWM Mode. When VIN is LOW, fixed switching is maintained as long as: 7 . 0 1 ) ( SW MIN OFF IN OUT f t V V . The switching frequency drops when the regulator cannot provide sufficient duty cycle at 6 MHz to maintain regulation. This occurs when VOUT is 1.82 V and VIN is below 2.7 V at high load currents (see Figure 32). 0 1,500 3,000 4,500 6,000 7,500 0 200 400 600 800 1000 Load Current (mA) 2.7VIN, AUTO 2.3VIN, AUTO 2.7VIN, PWM 2.3VIN, PWM Figure 32. Frequency vs. Load Current to Demonstrate tOFFMIN Effect, VIN=2.3 V and 2.7 V, VOUT=1.82 V, Auto Mode, FPWM Dotted The calculation for switching frequency is given by: MHz t f MAX SW SW 6 , 1 min ) ( (3) where: OUT ON OUT IN OFF OUT OUT MAX SW V R I V R I V ns t 1 40 ) ( (4) where: OFF R = L N DSON DCR R _ ON R = L P DSON DCR R _ |
Аналогичный номер детали - FAN53611 |
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Аналогичное описание - FAN53611 |
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