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FAN5354MPX Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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FAN5354MPX Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 14 page © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5354 • Rev. 1.0.5 6 Typical Characteristics Unless otherwise specified, VIN=5V, VOUT=1.2V, circuit of Figure 1, and components per Table 1. 0 100 200 300 400 500 600 700 800 900 1000 2.7 3.2 3.7 4.2 4.7 5.2 Input Voltage(V) 1.2VOUT boundary 1.2VOUT boundary 3.3VOUT boundary 3.3VOUT boundary Always PWM Always PFM Hysteresis - 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 0.5 1 1.5 2 2.5 3 Load Current (A) VIN = 4.1V VIN = 4.0V VIN = 3.9V VIN = 3.8V Figure 9. PFM/PWM Mode-Change Boundaries Figure 10. Effect of tOFF Minimum on Reducing Switching Frequency at Large Duty Cycles, VOUT=3.3V 0 2 4 6 8 10 12 14 16 0.1 1 10 100 1000 10000 Load Current(mA) 5VIN, 1.2VOUT 3.3VIN, 1.2VOUT 5VIN,3.3VOUT PFM PWM 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 Frequency (KHz) 1.2VOUT,1.5A load 3.3VOUT, 0.5A load in PFM 3.3VOUT, 1.5A load Figure 11. Output Voltage Ripple vs. Load Current (See explanation on page 12) Figure 12. Power Supply Rejection Ratio (PSRR) VOUT IL Figure 13. PFM-to-PWM Mode Transition, Slowly Increasing Load Current, 2 s/div. Figure 14 PWM-to-PFM Mode Transition, Slowly Decreasing Load Current, 2 s/div. |
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