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LT1787IMS8 Datasheet(PDF) 11 Page - Linear Technology |
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LT1787IMS8 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  11 LT1787/LT1787HV 1787fc APPLICATIONS INFORMATION with absolute minimum swing at 30mV above VEE. VOUT may swing positive to within 0.75V of VS+ or a maximum of 35V, a limit set by internal junction breakdown. Within these contraints, an amplified, level shifted representation of the RSENSE voltage is developed across ROUT. Split Supply Bipolar Output Swing Figure 2 shows the LT1787 used with split power supplies. The VBIAS pin is connected to ground, and the output signal appears at the VOUT pin. Bidirectional input currents can be monitored with the output swinging positive for current flow from VS+ and VS–. Input currents in the opposite direction cause VOUT to swing below ground. Figure 2 shows an optional output capacitor connected from VOUT to ground. This capacitor may be used to filter the output signal before it is processed by other circuitry.Figure 3 shows the voltage transfer function of the LT1787 used in this configuration. Single Supply with Shifted VBIAS Figure 4 shows the LT1787 used in a single supply mode with the VBIAS pin shifted positive using an external LT1634 voltage reference. The VOUT output signal can swing above and below VBIAS to allow monitoring of positive or negative currents through the sense resistor, as shown in Figure 5. The choice of reference voltage is not critical except for the precaution that adequate headroom must be provided for VOUT to swing without saturating the internal circuitry. The component values shown in Figure 4 allow operation with VS supplies as low as 3.1V. Figure 2. Split Supply Operation *OPTIONAL C2 1 µF –5V 1787 F02 OUTPUT C3* 1000pF C1 1 µF RSENSE 15V TO CHARGER/ LOAD 1 2 3 4 8 7 6 5 LT1787 FIL+ FIL– VBIAS VOUT VS – VS + DNC VEE ROUT Figure 3. Split Supply Output Voltage SENSE VOLTAGE (VS + – V S –) (mV) 1787 F05 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –128 –64 0 32 –96 –32 64 96 128 VS = 3.3V TO 60V TA = – 40°C TO 85°C Figure 5. Single Supply Output Voltage with VBIAS = 1.25V Figure 4. Charge/Discharge Current Monitor on Single Supply with VBIAS = 1.25V C2 1 µF 20k 5% 1787 F04 3.3V LT1634-1.25 *OPTIONAL OUTPUT C1 1 µF RSENSE 3.3V TO 60V TO CHARGER/ LOAD 1 2 3 4 8 7 6 5 LT1787HV FIL+ FIL– VBIAS VOUT VS – VS + DNC VEE C3* 1000pF ROUT SENSE VOLTAGE (VS + – V S –) (mV) 1787 F03 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –128 –64 0 32 –96 –32 64 96 128 VS = 3.3V TO 60V TA = – 40°C TO 85°C |
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