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LTC4008EGN-1 Datasheet(PDF) 11 Page - Linear Technology |
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LTC4008EGN-1 Datasheet(HTML) 11 Page - Linear Technology |
11 / 24 page 11 LTC4008 4008fa OPERATIO CLK (NOT TO SCALE) VNTC tSAMPLE VOLTAGE ACROSS THERMISTOR tHOLD 4008 F04 COMPARATOR HIGH LIMIT COMPARATOR LOW LIMIT Figure 4 The thermistor detector performs a sample-and-hold func- tion. An internal clock, whose frequency is determined by the timing resistor connected to RT, keeps switch S1 closed to sample the thermistor: tSAMPLE = 127.5 • 20 • RRT • 17.5pF = 6.7ms, for RRT = 150k The external RC network is driven to approximately 4.5V and settles to a final value across the thermistor of: V VR RR RTH FINAL TH TH () .• = + 45 10 This voltage is stored by C7. Then the switch is opened for a short period of time to read the voltage across the thermistor. tHOLD = 10 • RRT • 17.5pF = 26µs, for RRT = 150k When the tHOLD interval ends the result of the thermistor testing is stored in the D flip-flop (DFF). If the voltage at NTC is within the limits provided by the resistor divider feeding the comparators, then the NOR gate output will be low and the DFF will set TBAD to zero and charging will continue. If the voltage at NTC is outside of the resistor divider limits, then the DFF will set TBAD to one, the charger will be shut down, FAULT pin is set low and the timer will be suspended until TBAD returns to zero (see Figure 4). |
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Similar Description - LTC4008EGN-1 |
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