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ISL28005FH100Z-T7 Folha de dados(PDF) 9 Page - Intersil Corporation |
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ISL28005FH100Z-T7 Folha de dados(HTML) 9 Page - Intersil Corporation |
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9 / 14 page  ISL28005 9 FN6973.4 July 1, 2011 Applications Information Functional Description The ISL28005-20, ISL28005-50 and ISL28005-100 are single supply, uni-directional current sense amplifiers with fixed gains of 20V/V, 50V/V and 100V/V respectively. The ISL28005 is a 2-stage amplifier. Figure 18 shows the active circuitry for high-side current sense applications where the sense voltage is between 1.35V to 28V. Figure 19 shows the active circuitry for ground sense applications where the sense voltage is between 0V to 1.35V. The first stage is a bi-level trans-conductance amp and level translator. The gm stage converts the low voltage drop (VSENSE) sensed across an external milli-ohm sense resistor, to a current (@ gm = 21.3µA/V). The trans-conductance amplifier forces a current through R1 resulting to a voltage drop across R1 that is equal to the sense voltage (VSENSE). The current through R1 is mirrored across R5 creating a ground-referenced voltage at the input of the second amplifier equal to VSENSE. The second stage is responsible for the overall gain and frequency response performance of the device. The fixed gains (20, 50, 100) are set with internal resistors Rf and Rg. The only external component needed is a current sense resistor (typically 0.001 Ω to 0.01Ω, 1W to 2W). The transfer function is given in Equation 1. The input gm stage derives its ~2.86µA supply current from the input source through the RS+ terminal as long as the sensed voltage at the RS+ pin is >1.35V and the gmHI amplifier is selected. When the sense voltage at RS+ drops below the 1.35V threshold, the gmLO amplifier kicks in and the gmLO output current reverses, flowing out of the RS- pin. Test Circuits and Waveforms FIGURE 13. IS, VOS, VOA, CMRR, PSRR, GAIN ACCURACY FIGURE 14. INPUT BIAS CURRENT, LEAKAGE CURRENT FIGURE 15. SLEW RATE, ts, SATURATION RECOVERY TIME FIGURE 16. GAIN vs FREQUENCY FIGURE 17. SLEW RATE RS+ VCC RS- VOUT OUT RL GND VSENSE VRS+ 1M Ω + - + - RS+ VCC RS- VOUT OUT RL GND VSENSE VRS+ 1M Ω + - + - R1 R2 VR1 VR2 RS+ VCC RS- VOUT OUT RL GND VRS- VRS+ 1M Ω PULSE GENERATOR RS+ VCC RS- VOUT OUT RL GND VSENSE VRS+ 1M Ω SIGNAL GENERATOR RS+ VCC RS- VOUT OUT RL GND VRS+ 1M Ω PULSE GENERATOR VOUT GAIN ISRS VOS + () × = (EQ. 1) |
Nº de peça semelhante - ISL28005FH100Z-T7 |
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Descrição semelhante - ISL28005FH100Z-T7 |
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