TC622 TELCOM | Alldatasheet

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Technical content

2-21TELCOM SEMICONDUCTOR, INC. LOW COST, SINGLE TRIP POINT TEMPERATURE SENSOR

FEATURES

n Temperature Set Point Easily Programs with a Single External Resistor n Operates with 2.7V Power Supply (TC624) n TO-220 Package for Direct Mounting to Heatsink (TC622xAT) or Standard 8-Pin PDIP and SOIC n Cost Effective

APPLICATIONS

n Power Supply Over-temperature Detection n Consumer Electronics n Fire/ Heat Detection n UPS's, Amplifiers, Motors n CPU Thermal Management in PC's FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The TC622 and TC624 are programmable solid state temperature switches designed to replace mechanical switches in sensing and control applications. Both devices integrate the temperature sensor along with a voltage refer- ence and all required detector circuitry to form a stand-alone temperature switch. The desired temperature set point is set by the user with a single external resistor. Ambient temperature is sensed and compared to the programmed setpoint. The OUT and OUT outputs are driven to their active state when the measured temperature exceeds the programmed setpoint. TSET VDD GND OUT OUT TEMPERATURE TO VOLTAGE CONVERTER VOLTAGE REFERENCE GENERATOR TEMP SENSOR

ORDERING INFORMATION

Part No. Voltage Operation Package Ambient Temperature TC622COA 4.5V to 18V 8-Pin SOIC 0 °C to +70°C TC622CPA 4.5V to 18V 8-Pin Plastic DIP 0 °C to +70°C TC622EAT 4.5V to 18V 5-Pin TO-220 – 40 °C to +85°C TC622EOA 4.5V to 18V 8-Pin SOIC – 40 °C to +85°C TC622EPA 4.5V to 18V 8-Pin Plastic DIP – 40 °C to +85°C TC622VAT 4.5V to 18V 5-Pin TO-220 – 40 °C to +125°C TC622VOA 4.5V to 18V 8-Pin SOIC – 40 °C to +125°C TC622VPA 4.5V to 18V 8-Pin Plastic DIP – 40 °C to +125°C TC624COA 2.7V to 4.5V 8-Pin SOIC 0 °C to +70°C TC624CPA 2.7V to 4.5V 8-Pin Plastic DIP 0 °C to +70°C TC624EOA 2.7V to 4.5V 8-Pin SOIC – 40 °C to +85°C TC624EPA 2.7V to 4.5V 8-Pin Plastic DIP – 40 °C to +85°C TC624VOA 2.7V to 4.5V 8-Pin SOIC – 40 °C to +125°C TC624VPA 2.7V to 4.5V 8-Pin Plastic DIP – 40 °C to +125°C The TC622 has a power supply voltage range of 4.5V to 18.0V while the TC624 operates over a power supply range of 2.7V to 4.5V. Both devices are usable over a temperature range of – 40°C to +125°C (TC622Vxx, TC624Vxx). Both devices feature low supply current making them suitable for many portable applications. Eight-pin through-hole and surface mount packages are available. The TC622 is also offered in a 5-pin TO-220 package. TC622/24-4 9/25/96 TC622 TC624

2-22 TELCOM SEMICONDUCTOR, INC. ELECTRICAL CHARACTERISTICS (Over Operating Temperature Range, unless otherwise specified.) Parameter Conditions Min Typ Max Unit Supply Voltage Range TC622 4.5 — 18 V TC624 2.7 4.5 Supply Current TC622 5.0V ≤ VDD ≤ 18V — 200 600 µA TC624 2.7V ≤ VDD ≤ 4.5V — 170 300 VOH TC622 5.0V ≤ VDD ≤ 18V, – 40°C ≤ TA ≤ +125°C, IOH = 250µA 0.90 x V DD —— V IOH = 500µA 0.80 x V DD —— VOL TC622 – 40 °C ≤ TA ≤ +85°C, IOL = 500µA — — 0.15 x V DD V IOL = 1mA — — 0.30 x V DD – 40°C ≤ TA ≤ +125°C, IOL = 1mA — — 0.35 x V DD VOH TC624 2.7V ≤ VDD ≤ 4.5V, – 40°C ≤ TA ≤ +125°C, IOH = 250µA 0.9 x V DD —— V IOH = 500µA 0.8 x V DD —— VOL TC624 – 40 °C ≤ TA ≤ +85°C, IOL = 500µA — — 0.1 x V DD V IOL = 1mA — — 0.2 x V DD – 40°C ≤ TA ≤ +125°C, IOL = 1mA — — 0.25 x V DD TC624 T SET = Programmed Temperature T – 5 T ± 1 T + 5 Trip Point Hysteresis TC622 — 2 — °C TC624 — 2 — ABSOLUTE MAXIMUM RATINGS* *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. The TC622 and TC624 are single point temperature detectors ideal for use in a wide variety of applications. When the temperature of the device exceeds the pro- grammed temperature trip point, T SET , the OUT and OUT outputs are driven into their active states. The desired trip- point temperature is programmed with a single external resistor connected between the T SET input and VCC . The relationship between the resistor value and the trip point temperature is given by the equation below. R TRIP = 0.5997 x T 2.1312 Where Rtrip = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. For example, to program the device to trip at 50°C, the programming resistor is: R TRIP = 0.5997 x ((50 + 273.15)2.1312) = 133,652 Ω DETAILED DESCRIPTION LOW COST, SINGLE TRIP POINT TEMPERATURE SENSOR TC622 TC624

2-23TELCOM SEMICONDUCTOR, INC. Figure 1. TC622/624 Hysteresis