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BD6155FVM Datasheet(PDF) 4 Page - Rohm |
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BD6155FVM Datasheet(HTML) 4 Page - Rohm |
4 / 8 page BD6155FVM Communication ICs 4/7 ! ! ! ! Circuit operation 1) Charge pump driver Charge pump is consisted capacitor pin (pin7), external schotky diodes and capacitors. Output voltage at no loading is 2VBAT-2VF. (VF is as same as schotky’s VF ) Output voltage at loading is referred Fig2. As standard example, however it depends on external components. VBAT Shotky diodes RB521-S30 Charge pump output LED 1 µF C (Pin7) 1 µF 20 40 0 60 80 100 15 3 0 6 9 12 OUTPUT LOAD : (mA) Fig.2 Charge pump loading characteristics (Typical operating characteristics) VBAT=2.9V VBAT=3.6V VBAT=5.5V 2) Fixed current driver LED driver fixed current is determined by resistor value between LEDS pin (pin4) and GND. At current control set up voltage1 (Current1, 2=High) resistor value between LEDS-GND is set as 2.7 Ω. 205mV ÷ 2.7Ω = 75.9mA (2 expressions) The above current is loaded to LED as fixied current. LED LED (5Pin) + − LEDS (4Pin) RSENSE CURRENT1 CURRENT2 • LED drive current fix example LEDS pin voltage (mV) LED drive current (mA) RSENSE=2.7 Ω RSENSE=5.1Ω 105.0 38.9 20.6 Current control setup voltage 1 (Current 1=High Current 2=High) Current control setup voltage 2 (Current 1=Low Current 2=High) Current control setup voltage 3 (Current 1=High Current 2=Low) Current control setup voltage 4 (Current 1=Low Current 2=Low) 205.0 40.2 75.9 57.4 155.0 30.4 55.0 10.8 20.4 The less RSENSE, the bigger fixed current for LED drive. Resistors value should be determined with confirmation of charge pump loading characteristics (Fig.2) and LED's I-V characteristics. |
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