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SC600DIMSTRT Datasheet(PDF) 9 Page - Semtech Corporation |
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SC600DIMSTRT Datasheet(HTML) 9 Page - Semtech Corporation |
9 / 19 page 9 © 2006 Semtech Corp. www.semtech.com POWER MANAGEMENT SC600 Applications Information (Cont.) Brightness Control with PWM Input Brightness control using a PWM input can be achieved with the application circuit below. Note that by connecting CX8 to the PWM signal the switching frequency is changed as the PWM signal changes. The charge pump operates at 262kHz during the on-time when there is a demand for current, and then changes to 32kHz when there is no load current. This is done to save battery power by taking ad- vantage of the lower 280μA quiescent current at 32kHz. The ripple voltage seen at the output is reasonable for LED applications, but the output capacitance can be in- creased to reduce the ripple if required. The sum of the LED currents for this circuit is 55mA during the on-time. White LED Driver Circuit with PWM Brightness Control Voltage Waveforms for LED Driver Circuit Cin 1uF 2.7V to 6. 5V Cbucket1 1uF Cbucket2 1uF VI N EN CD4 CX8 GN D CF2- CF2+ CF1- CF1 + VOUT 3 6 4 5 8 7 10 9 2 1 U1 Cout 1uF PW M 10 0 10 0 100 5.0 V Ripple Voltage vs. Input Voltage 0 50 100 150 200 250 300 350 400 450 500 2.8 3.3 3.8 4.3 4.8 5.3 5.8 Input Voltage [V] Vout p-p Vin p-p Battery Current vs. Input Voltage for Various Duty Cycles 0 20 40 60 80 100 120 2.83 3.23.43.63.84 Input Voltage [V] 89.20% 70.30% 50.20% 30.20% |
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