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BD83740HFP-M Datasheet(PDF) 8 Page - Rohm |
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BD83740HFP-M Datasheet(HTML) 8 Page - Rohm |
8 / 32 page 8/28 BD83740HFP-M TSZ02201-0T1T0C700170-1-2 © 2014 ROHM Co., Ltd. All rights reserved. 06.Sep.2016 Rev.002 www.rohm.com TSZ22111・15・001 [s] C R I C ΔV T1 CRT CHA CRT_SO CRT CRT 3. PWM Dimming Operation PWM Dimming is performed if CRT terminal is the following circuit. Dimming cycle and Duty width can be set through external resistance value and capacity. CR timer function in IC is activated if DC_in is OPEN. In order to perform PWM light control of LED current, triangular waveform is generated at CRT terminal. Output is controlled so that LED current is turned OFF while CRT voltage is ramping up, and LED current is turned ON while CRT voltage is ramping down. Ramp up/down time of CRT voltage can be set by values of external components (CCRT, RCRT). Figure 11. PWM Fimming Operation (1) CRT Ramp up Time T1 CRT ramp up time can be obtained from the following equations: where: ICRT_SO is the CRT Terminal Charge Current 35μA (Typ) RCHA is the CRT Terminal Charge Resistance 54.3k Ω(Typ) VCRT_DIS1 VCRT_CHA CRT 端子波形 IOUT 波形 1.1V 3.0V T1 T2 0 ) (2) T2 = - CCRT × (RCRT + RD1 ) × ln ( VCRT_CHA VCRT_DIS1 CRT電圧立上り CRT電圧立下り LED OFF LED ON ΔVCRT (1) T1 = ICRT_SO ΔVCRT × CCRT IOUT CRT Voltage Ramp-up CRT Voltage Ramp-down CRT Terminal Waveform IOUT Waveform VREF IOUT VIN VIN-0.180V (Typ) GND VIN_F OSC CRT DISC ICRT=35µA(Typ) 50 Ω(Typ) IOUT CCRT RCRT ON/OFF +B PWM_in DC_in |
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