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BD83733HFP-MTR Datasheet(PDF) 9 Page - Rohm |
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BD83733HFP-MTR Datasheet(HTML) 9 Page - Rohm |
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9 / 33 page  9/29 BD83732HFP-M / BD83733HFP-M TSZ02201-0G1G0C700310-1-2 © 2014 ROHM Co., Ltd. All rights reserved. 2016.Aug.25 Rev.003 www.rohm.com TSZ22111・15・001 [s] V V ln ) R R ( C T2 CRT_DIS1 CRT_CHA D1 CRT CRT [Hz] 2 T 1 T 1 f PWM 2 T 1 T 2 T DON (2) CRT Ramp down Time T2 CRT ramp down time is defined by the discharge period due to the external capacitor CCRT and resistance (RCRT + RD1). The CRT Terminal Charge Current is OFF at CRT ramp down. Make sure that T2 is set > pulse width 2 0μs (Min). where: RD1 is the CRT Terminal Discharge Resistance 1 50Ω (Typ) VCRT_CHA is the CRT Terminal Discharge ON Voltage 1.1V (Typ) VCRT_DIS1 is the CRT Terminal Discharge ON Voltage 3.0V (Typ) (3) Dimming Frequency fPWM PWM frequency is defined by T1 and T2. (4) ON Duty (DON) Like the above, PWM ON duty is defined by T1 and T2. (Example) In case of fPWM = 518Hz and 6.7% Duty (Typ), From fPWM=518Hz; T1 + T2 = 1 / fPWM = 1 / 518Hz = 1931 μs From ON Duty = 6.7%; CRT ramp up time T1 is T1 = (T1 + T2) × 0.933 = 1801.6μs External capacity CCRT is; CCRT = T1 × (ICRT / ΔVCRT) = 1801.6μs × 35μA / 1.9V ≒ 0.033μF CRT ramp down time T2 is; T2 = (T1 + T2) × 0.067 = 129μs External resistance RCRT is; RCRT = －T2 / (CCRT × ln(VCRT_CHA / VCRT_DIS)) － RD1 = －129usec / (0.033μF × ln(1.1 / 3.0)) – 50Ω ≒ 3.9kΩ PWM Dimming Operation using external signal An external microcomputer can directly drive the PWM signal for Dimming CRT terminal. In that case, ’High’ level voltage of PWM signal should be > VCRT_DIS2(4.4V(Max)) and ’Low’ level voltage of PWM signal < VCRT_CHA(0.99V(Min)). Figure 15. External Input of PWM Signal VREF IOUT VIN VIN-0.180V (Typ) GND VIN_F OSC CRT +B PWM Signal Input |
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