Datasheet LTC1923 (Analog Devices) - 6

LTC1923
W U TYPICAL PERFOR A CE CHARACTERISTICS Current Limit Threshold System Power Loss TEC Clamp Voltage vs Temperature vs TEC Current vs Temperature
165 0.7 2.550 TA = 25°C 160 0.6 2.530 155 0.5 150 2.510 0.4 145 VDD = 5V 0.3 140 2.490 V POWER LOSS (W) DD = 3.3V 0.2 135 TEC CLAMP VOLTAGE (V) 2.470 CURRENT LIMIT THRESHOLD (mV) 130 0.1 125 0 2.450 –50 –20 10 40 70 100 130 0 0.5 1 –50 –20 10 40 70 100 130 TEMPERATURE (°C) TEC CURRENT (A) TEMPERATURE (°C) 1923 G10 1923 G11 1923 G12
Representative Waveforms for NDRVA, NDRVB, TEC Current and CS+ – CS–
CH1: TEC CURRENT (500mA/DIV) CH2: VOLTAGE ACROSS 0.1Ω SENSE RESISTOR (CS + – CS –) 100mV/DIV CH3: NDRVA (5V/DIV) CH4: NDRVB (5V/DIV) VDD = 5V 1923 G15.tif RTEC = 2.5Ω RS = 0.1Ω
Representative Waveforms for TEC Current, CS+ – CS– and ITEC
CH2: VOLTAGE ACROSS 0.1Ω SENSE RESISTOR RS (CS+ – CS–) 100mV/DIV CH2 CH3: VOLTAGE ON ITEC PIN EQUAL TO TEN TIMES THE ABSOLUTE VALUE OF CH2 (200mV/DIV) CH1: TEC CURRENT (500mA/DIV) CH1, CH3 VDD = 5V 1923 G16.tif RTEC = 2.5Ω RS = 0.1Ω 1923f 6