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SN75372PSRG4 Datasheet(PDF) 7 Page - Texas Instruments |
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SN75372PSRG4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 19 page SN75372 DUAL MOSFET DRIVER SLLS025A − JULY 1986 3−7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 THERMAL INFORMATION power dissipation precautions Significant power may be dissipated in the SN75372 driver when charging and discharging high-capacitance loads over a wide voltage range at high frequencies. Figure 5 shows the power dissipated in a typical SN75372 as a function of load capacitance and frequency. Average power dissipated by this driver is derived from the equation PT(AV) = PDC(AV) + PC(AV) = PS(AV) where PDC(AV) is the steady-state power dissipation with the output high or low, PC(AV) is the power level during charging or discharging of the load capacitance, and PS(AV) is the power dissipation during switching between the low and high levels. None of these include energy transferred to the load, and all are averaged over a full cycle. The power components per driver channel are P C(AV) [ CV2 C f tHL tLH tH tL T = 1/f Figure 12. Output Voltage Waveform where the times are as defined in Figure 14. PDC(AV) = PH t H + PL t L T PS(AV) = PLH t LH + PHL t HL T PL, PH, PLH, and PHL are the respective instantaneous levels of power dissipation, C is the load capacitance. VC is the voltage across the load capacitance during the charge cycle shown by the equation VC = VOH − VOL PS(AV) may be ignored for power calculations at low frequencies. In the following power calculation, both channels are operating under identical conditions: VOH =19.2 V and VOL = 0.15 V with VCC1 = 5 V, VCC2 = 20 V, VC = 19.05 V, C = 1000 pF, and the duty cycle = 60%. At 0.5 MHz, PS(AV) is negligible and can be ignored. When the output voltage is high, ICC2 is negligible and can be ignored. On a per-channel basis using data sheet values, P DC(AV) + (5 V) 2mA 2 ) (20 V) 0mA 2 (0.6) ) (5 V) 16 mA 2 ) (20 V) 7mA 2 (0.4) PDC(AV) = 47 mW per channel Power during the charging time of the load capacitance is PC(AV) = (1000 pF) (19.05 V)2 (0.5 MHz) = 182 mW per channel Total power for each driver is PT(AV) = 47 mW + 182 mW = 229 mW and total package power is PT(AV) = (229) (2) = 458 mW. |
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