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MAX1979 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1979 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 20 page Integrated Temperature Controllers for Peltier Modules _______________________________________________________________________________________ 9 Pin Description THERMAL STABILITY, ROOM TEMPERATURE 4s/div TEMPERATURE 0.001 °C/div ITEC = +25 °C TA = +25 °C THERMAL STABILITY, HEATING MODE 4s/div TEMPERATURE 0.001 °C/div TTEC = +25 °C TA = +5 °C TEMPERATURE ERROR vs. AMBIENT TEMPERATURE AMBIENT TEMPERATURE ( °C) 30 40 10 20 0 -10 -0.02 -0.01 0 0.01 0.02 0.03 -0.03 -20 50 Typical Operating Characteristics (continued) (VDD = 5V, VCTLI = 1V, VFREQ = GND, RTEC = 1Ω, circuit of Figure 1, TA = +25°C, unless otherwise noted.) PIN NAME FUNCTION 1 OS2 Output Sense 2. OS2 senses one side of the differential TEC voltage. OS2 is a sense point, not a power output. 2, 8, 29, 35 N.C. Not Internally Connected 3, 5 PGND2 Power Ground 2. Internal synchronous rectifier ground connections. Connect all PGND pins together at power ground plane. 4, 6, 9 LX2 Inductor 2 Connection. Connect all LX2 pins together. Connect LX2 to LX1 when using the MAX1979. 7, 10 PVDD2 Power 2 Inputs. Must be same voltage as VDD. Connect all PVDD2 inputs together at the VDD power plane. Bypass to PGND2 with a 10µF ceramic capacitor. 11 SHDN Shutdown Control Input. Active-low shutdown control. 12 OT Over-Temperature Alarm. Open-drain output pulls low if temperature feedback rises 20mV (typically +1.5°C) above the set-point voltage. 13 UT Under-Temperature Alarm. Open-drain output pulls low if temperature feedback falls 20mV (typically +1.5°C) below the set-point voltage. 14 INTOUT Integrator Amp Output. Normally connected to CTLI. 15 INT- Integrator Amp Inverting Input. Normally connected to DIFOUT through thermal-compensation network. 16, 25, 26, 42, 43 GND Analog Ground. Connect all GND pins to analog ground plane. 17 DIFOUT Chopper-Stabilized Instrumentation Amp Output. Differential gain is 50 ✕ (FB+ - FB-). 18 FB- Chopper-Stabilized Instrumentation Amp Inverting Input. Connect to thermistor bridge. 19 FB+ Chopper-Stabilized Instrumentation Amp Noninverting Input. Connect to thermistor bridge. 20 BFB- Chopper-Stabilized Buffered FB- Output. Used to monitor thermistor bridge voltage. 21 BFB+ Chopper-Stabilized Buffered FB+ Output. Used to monitor thermistor bridge voltage. 22 AIN+ Undedicated Chopper-Stabilized Amplifier Noninverting Input |
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