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LP3928 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LP3928 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 11 page Note 16: This is the static current consumption from VCCA for the part common to the channels. Note 17: Only ICCBTOTAL for DIR1=DIR2=DIR3=H and ICCATOTAL for DIR1=DIR2=DIR3=L will be tested in production. Calculation example: assuming DIR1=H, DIR2=L, DIR3=L, then the typical ICCB current will be: I CCBTOTAL =IBCOM +ICHA →B +2 * ICHB→A = 450 µA + 530 µA + 2 * 2 µA = 984 µA The typical ICCA current is: ICCATOTAL =IA = 90 µA. Note 18: This is the time it takes either to switch the level shifter on or off, or the time it takes to turn the latch by-pass on/off. Note 19: This is the time it takes to switch the direction of the level shifter. After this time a signal can be applied on the new input. For the B →A direction, if EN2=1, the latch set-up time has to be considered separately. Note 20: The output voltage changes slightly with line voltage. An increase in the line voltage results in a slight increase in the output voltage and vice versa. Note 21: The output voltage changes slightly with load current. An increase in the load current results in a slight decrease in the output voltage and vice versa. Note 22: Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its normal value. This specification does not apply for input voltages below 2.7V. Note 23: Turn-on time is that between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal value. Note 24: Range of capacitor values for which the device will remain stable. This electrical specification is guaranteed by design. Note 25: Range of capacitor ESR values for which the device will remain stable. This electrical specification is guaranteed by design. Note 26: The built-in thermal shut-down of the LDO is also used to put all Ai and Bi outputs in tristate mode. Note 27: Additional information on lead temperature and pad temperature can be found in National Semiconductor Application Note (AN-1112). Note 28: Unused inputs must be terminated. Note 29: This electrical specification is guaranteed by design. Typical Performance Characteristics Unless otherwise specified: C VBAT = 1 µF, CVCCA = 1 µF, C VCCB = 1 µF, VBAT = 3.3V, VCCA = 1.8V, TA = 25˚C. Level Shifter Propagation Delay A →B Level Shifter Propagation Delay B →A 20039109 20039110 20039106 FIGURE 1. Output AC Line Regulation 20039107 FIGURE 2. PSRR Input Perturbation www.national.com 8 |
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