Datasheet LTC1923 (Analog Devices) - 10

LTC1923
U U W FU CTIO AL DIAGRA
+ + – – DD SS V I LIM CS CS PGND TEC PDRVA PDRVB NDRVA NDRVB TEC µA 1.5 1923 BD DDV + – DIRECTIONAL COMPARATOR INPUT SELECT INPUT SELECT 1 = NO SLEW LIMITING SWITCHES OPEN RT + – + – ∝ I 90ns 90ns DELAY DELAY X10 X1 DELAY H/C – + CS AMP TEC AMP 1V – – – + R TEC DD V PDRVB NDRVA PDRVA NDRVA 2R 1/2 V SLEWR I SLEW SLEW LIMITING I TEC DDV QB ENABLE OSC PEAK Q ENABLE OSC VALLEY BE + V DDV 1 4 S R S R CURRENT LIMIT Q Q Q Q Q QB Q Q S R FAULT 1.5V SS + – MASTER COMPARATOR + – 0.3V TEC 2.5V V – + TSD ENABLE – + RAMP = 0.5V – 1.5V + – ENABLE – 0.4V Q PLLLPF GOOD DD g m ENABLE V g m S R REFV 1 = REFGOOD COMPARATOR TEC OSCILLATOR CLAMP TSD UVLO SHDN 1 = SHDN REFGOOD DIGITAL PHASE DETECTOR BGV REF REFV SHUTDOWN COMPARATOR 0.5V 2.5V LDO + – + – – ERROR AMPLIFIER + – + – + AGND g m OPEN/SHORTED THERMISTOR DD R SET V µs UVLO 1 = UVLO 0.7V 20 DELAY 350mV 0.2V T T I RT R C FB SETV THRM CNTRL SDSYNC EAOUT V 1923f 10