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SC4911 Datasheet(PDF) 10 Page - Semtech Corporation |
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SC4911 Datasheet(HTML) 10 Page - Semtech Corporation |
10 / 14 page 10 2006 Semtech Corp. www.semtech.com SC4911 POWER MANAGEMENT Typical Applications (Cont.) 48V to 12V FLYBACK CONVERTER AS BATTERY CHARGER Figure 5 is another example of non-isolated feedback, low power and compact application of the SC4911 as a battery charger. Battery charging rate is determined by current sense resistor R8. LUVLO is used to not only turn on or turn off the charger by battery charge controller, but also monitors the input line voltage via resistor R2 and R5 to determine turn-on and turnoff of the converter. During the start-up, the input source trickle charges the capacitor C3 through start-up resistor R1. As long as voltage across C3 reaches the Vcc turn-on threshold, the SC4911 turns on abruptly and starts driving the gate of MOSFET Q1. After the SC4911 starts up the secondary winding supplies the primary circuitry. Q1 Si2320DS C4 150pF R3 68 To Battery Charger Controller U1 SC4911 1 2 3 4 5 6 7 8 LUVLO RT FB COMP ILIM GND OUT VCC C6 1000pF R7 100K R8 1.00 D1 1N5819 R2 2.7MEG T1 R10 100K R6 51 Vin = 48V C3 10uF R9 4.7K To 12V Battery R4 619K D2 1N5819 C1 47uF R1 100K C2 10uF C5 47nF R5 100K Figure 5. 48V to 12V Flyback Converter as Battery Charger In this application, voltage feedback is directly brought from the output to the input error amplifier of SC4911 through R4 and R7. C5 and R9 are for frequency compensation. |
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