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LT1787HVCS8 Datasheet(PDF) 9 Page - Linear Technology |
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LT1787HVCS8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LT1787/LT1787HV Figure 3. Split Supply Output Voltage 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 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 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 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 amplified sense voltage appearing between the A/D con- verters –IN and +IN terminals. The front page of the data sheet shows a similar circuit which uses a voltage refer- ence for improved accuracy and signal range. The LTC1286 converter uses sequential sampling of its –IN and +IN inputs. Accuracy is degraded if the inputs move between sampling intervals. A filter capacitor from FIL+ to FIL– as well as a filter capacitor from VBIAS to VOUT may be necessary if the sensed current changes more than 1LSB within a conversion cycle. Figure 6. Unidirectional Output into A/D with Fixed Supply at VS + R2 5k 5% 1787 F06 IOUT C1 1 µF 5V VREF VCC GND LTC1286 CS CLK DOUT +IN –IN TO µP RSENSE 5V 1 2 3 4 8 7 6 5 LT1787 FIL+ FIL– VBIAS VOUT VS – VS + DNC VEE R1 20k 5% ROUT APPLICATIONS INFORMATION |
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