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FAN5331 Datasheet(PDF) 8 Page - Fairchild Semiconductor |
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FAN5331 Datasheet(HTML) 8 Page - Fairchild Semiconductor |
8 / 10 page 8 www.fairchildsemi.com FAN5331 Rev. 1.0.1 The feedback loop tightly regulates the current in the branch connected to FB pin, while the current in the other branch depends on the sum of the LED’s forward voltages, VOUT and the ballast resistor. The input and the output ripple is less than 3mVRMS, for load currents up to 40mA. A Zener diode (VZ = 22V) connected between VOUT and GND can prevent the FAN5331 from being damaged by over-voltage, if the load is accidently disconnected during operation. 2. Dual Boost Converter A negative voltage can be provided by adding an external charge pump (C1, C2, D2, and D3). Figure 7. Dual (±) Boost Converter While the feedback loop tightly regulates VOUT, the negative out- put voltage (-VOUT) can supply a light load with a negative volt- age. Nevertheless, the negative voltage depends on the changes of the load current in both -VOUT and +VOUT, as shown in the graph below. SHDN VIN VOUT -VOUT R1 R2 GND V IN FB SW CF CIN 10µH 1 3 2 4 5 4.7 µF 120pF COUT L BAT54 BAT54S 4.7 µF 2.7V to 5.5V ON OFF C2 C1 D1 D3 D2 4.7 µF 0.1 µF IOUT = 10mA IOUT = 50mA 0 10203040 50 -18 -16 -14 -12 -10 Negative Output Voltage vs Load Current Load Current On Positive Output Side (mA) -15V/Unloaded -15V/10mA Load |
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