U 6044 B TELEFUNKEN Semiconductors Radiator fan controlled timer Description The bipolar integrated circuit, U 6044 B, is designed as a radiator fan controlled timer. After the ignition is switched off, the thermal switch of the engine can activate the radiator fan via relay for a preset period, to support the cool-off process. In addition, an air-conditioning contact can switch on the radiator fan at any time. Features D D D D D D D D D D Delay time range: 4 s to 20 h Cool-off time starts when thermal switch is closed RC oscillator determines switching characteristics Relay driver with Z-diode Debounced input for coolant temperature switch Cases: Not debounced input for ignition key (Terminal 15) Low standby current Load dump protection RF interference protected Protection according to ISO/TR 7637-1 (VDE 0839) DIP 8, SO 8 C2 10 mF R2 R1 510 W VS 8 Vstab 7 OSC 6 C1 Stabilization Power-on reset Load dump detection Oscillator x VBatt 1 GND Frequency divider Debouncing Thermal switch Monoflop 4 Air condition 5 R4 300 kW R5 300 kW R6 1 kW 1 kW Relay control output Logic 94 9232 Ignition 3 C4 100 nF 2 C3 100 nF R7 R3 20 kW Terminal 15 x Figure 1 Block diagram with external circuit Rev. A1: 12.12.1994 1 U 6044 B TELEFUNKEN Semiconductors Pin Configuration Pin 1 2 3 4 5 6 7 8 Symbol GND Output Ignition Sth AC OSC Vstab VS Function Reference point, ground Relay control output Signal input, ignition Thermal switch, input Air condition input RC oscillator input Stabilized voltage Supply voltage GND 1 8 VS Output 2 7 Vstab Ignition 3 6 OSC 4 5 Air condition Sth 94 9233 Functional description Power supply, Pin 8 For reasons of interference protection and surge immunity, the supply voltage (Pin 8) must be provided with an RC circuit as shown in figure 2a. Dropper resistor, R1, limits the current in case of overvoltage, whereas C1 smoothes the supply voltage at Pin 8. Recommended values are: R1 = 510 , C1 = 47 F. In case of figure 1, capacitor, C1, has a value of 10 F, VBatt 510 R1 47 F/ 16 V The integrated Z-diode (14 V) protects the supply voltage,VS, therefore, the operation of the IC is possible between 6 V and 16 V, supplied by VBatt. However, it is possible to operate the integrated circuit with a 5 V supply, but it should be free of interference voltages. In this case, Pin 7 is connected to Pin 8 as shown in figure 2b, and the R1C1 circuit is omitted. C2 C2 C1 because a diode is connected between VBatt and resistance, R1. VS = 5 V R2 R2 8 7 6 5 1 2 3 4 8 7 6 5 1 2 3 4 VBatt 94 8750 94 8749 Figure 2a Basic circuit for 12 V voltage supply and oscillator 2 Figure 2b Basic circuit for VS = 5 V Rev. A1: 12.12.1994 U 6044 B TELEFUNKEN Semiconductors Oscillator, Pin 6 Oscillator frequency, f, is determined mainly by R2C2-circuit. Resistance, R2, determines the charge time, whereas the integrated resistance (2 kW) is responsible for discharge time. For the stability of the oscillator frequency, it is recommended to select R2 much greater than internal resistance (2 kW), because the temperature response and the tolerances of the integrated resistance are considerably greater than the external resistance value. Oscillator frequency, f, is calculated as follows: f + t )1 t 1 output transistor is dimensioned so that it can withstand the current produced. Power-on reset When the operating voltage is switched on, an internal power-on reset pulse (POR) is generated which sets the logic of the circuits to a defined initial condition. The relay control output is disabled. Input stages 20 k W Ignition 2 where t1 = charge time = a1 R2 C2 t2 = discharge time = a2 2 kW C2 @ @ @ 100 nF 20 k W 7V 15 pF 94 8813 a1 Figure 3a Input circuit for ignition (Pin 3) Debounce time, t3, and the delay time, td, depend on the oscillator frequency, f, as follows: t3 td + 6 @ 1f + 73728 @ 1f Table 1 shows relationships between t3, td, C2, R2 and frequencies from 1 Hz to 20 kHz. Output, Pin 2 Output Pin 2 is an open collector Darlington circuit with integrated 23-V Z-diode for limitation of the inductive cut–off pulse of the relay coil. The maximum static collector current must not exceed 300 mA and the saturation voltage is typically 1.1 V @ 200 mA. The output stage can be activated D directly with the AC input independent of the ignition input and Sth input D during the delay time which is started by the ignition input with the Sth input Interference voltages and load dump The IC supply is protected by R1, C1, and an integrated Z-diode, while the inputs are protected by a series resistor, integrated Z-diode and RF-capacitor (refer to Figure 3). The relay control output is protected via the integrated 23-V Z-diode in the case of short interference peaks. It is switched to conductive condition for a battery voltage of greater than approx. 40 V in the case of load dump. The Rev. A1: 12.12.1994 – + Terminal 15 @ and a2 are constants and has a1 = 0.833 and a2 = 1.551 when C2 = 470 pF to 10 nF a1 = 0.746 and a2 = 1.284 when C2 = 10 nF to 4700 nF 2V Pin 3 VS (Pin 8) Pin 4, 5 – + 15 pF 94 8815 Figure 3b Input circuit Pin 4 and Pin 5 Figure 3a shows the internal input circuit of ignition (Pin 3). It has an integrated pull-down resistor (20 kW), RF-capacitor (15 pF) and 7-V Z-diode. It reacts to voltages greater than 2 V. The thermal switch input, Sth, is internally debounced and only needs an external protection resistor. The air conditioning input, AC, and the signal input, ignition, are not debounced and external R/C filters are recommended to prevent the integrated circuit from unintentional activation by transients. The ignition input is switched to VBatt, the Sth and AC inputs are switched to GND and need pull up resistors externally (figure 3b). The detection threshold voltage of all three input stages is typically 2 V. Ignition input (terminal 15) is not debounced. Debouncing can be achieved by external circuit (R3,C3) connected to Pin 3 (see figures 1 and 5). 3 U 6044 B TELEFUNKEN Semiconductors VBatt Ignition Pin 3 Sth Closed Open Pin 4 AC Closed Open Pin 5 Delay time td t3 Pin 2 Relay 93 7746 e Figure 4 Timing waveform Relay control output behaviour, Pin 2, figure 4 VBatt R1 Integrated circuit controls the cooling fan motor in automobile by means of a relay. R2 8 C2 6 7 5 C1 Relay control output, Pin 2, is disabled when the battery voltage, VBatt, is applied. Relay control output follows the conditions of the switch, Sth., during the delay time, td, which starts when the ignition is switched-OFF This is possible only after the debounce time, t3. R5 47 mF 1 4 3 2 C3 Air condition input, Pin 5 The relay control output, Pin 2 follows the condition of the AC input, independent of operating conditions. 200 kW 100 nF 510 W R4 2 kW 100 nF 20 kW 94 8812 Terminal 15 R3 Sth Thermal switch Figure 5 Basic circuit 4 Rev. A1: 12.12.1994 U 6044 B TELEFUNKEN Semiconductors Absolute Maximum Ratings Parameters Operating voltage t = 1 min t = 60 min Ambient temperature range Storage temperature range Junction temperature Symbol VBatt Unit V Tamb Tstg Tj Value 24 18 –40 to +125 –55 to +125 150 Symbol RthJA RthJA Maximum 110 160 Unit K/W K/W °C °C °C Thermal Resistance Junction ambient Parameters DIP 8 SO 8 Electrical Characteristics VBatt =13.5 V, Tamb = 25°C, reference point ground, figure 2, unless otherwise specified Parameters Test Conditions / Pin Symbol Min Typ Operating voltage VBatt 6 R1 510 W t = 1 min t = 60 min 5 V supply Without R1, C1 V8, V7 4.3 figure 2b Pins 7 and 8 Stabilized voltage Pin 7 V7 5.0 5.2 Undervoltage threshold Power on reset VS 2.4 Supply current Push-buttons open Pin 8 IS Internal Z-diode I8 = 10 mA Pin 8 VZ 13.5 14 Relay output Pin 2 Saturation voltage I2 = 200 mA V2 1.2 I2 = 300 mA Leakage current V2 = 14 V Ilkg 2 Output current I2 Output pulse current Load dump pulse I2 Internal Z-diode I2 = 10 mA V2 20 23 Oscillator input f = 0.001 to 40 kHz, see table 1 Pin 6 Internal discharge resistance R6 1.6 2.0 Switching voltage Lower V6L 0.9 1.1 Upper 2.8 3.1 V6H Input current V6 = 0 V –I6 Switching times Debounce time t3 5 Delay time cooling off period td 72704 Inputs Pin 3, 4, 5 Switching threshold V3,4,5 1.6 2.0 Ignition input Pin 3 Pull-down resistance Switched to VBatt (15) R3 13 20 Protective diode I3 = 10 mA V3 6.5 7.1 Thermal switch Pin 4 Input current V4 = 0 V – I4 Air condition input Pin 5 Input current V5 = 0 V – I5 w Rev. A1: 12.12.1994 Max 16 24 18 6.0 Unit 5.4 4.2 1.0 16 V V mA V V V V 1.5 100 300 mA 1.5 24 A V 2.4 1.4 3.5 1 mA kW V mA 7 74752 cycles cycles 2.4 V 50 8.0 kW V 2 mA 2 mA 5 U 6044 B TELEFUNKEN Semiconductors Table 1 Oscillator frequency, debounce and delay time dimensioning Frequency f Hz 1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100 200 300 400 500 6 Debounce time t3 ms 6000 3000 2000 1500 1200 1000 857 750 667 600 300 200 150 120 100 86 75 67 60 30 20 15 12 Delay time td min 1229 614 410 307 246 205 176 154 137 123 61 41 31 25 20 18 15 14 12 s 369 246 184 147 C2 R2 nF 4700 1000 1000 1000 1000 1000 1000 1000 1000 1000 100 100 100 100 100 100 100 100 100 10 10 10 10 kW 280 650 440 330 260 220 190 160 140 130 650 440 330 260 220 190 160 140 130 600 400 300 240 Frequency f Hz 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000 Debounce time t3 ms 10 9 8 7 6 3.00 2.00 1.50 1.20 1.00 .86 .75 .67 .60 .55 .50 .46 .43 .40 .38 .35 .33 .32 .30 Delay time td C2 R2 min nF 10 10 10 10 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 kW 200 170 150 130 120 600 400 300 240 200 170 150 130 120 110 99 91 85 79 74 70 66 62 59 s 123 105 92 82 74 37 25 18 15 12 11 9 8 7 6.7 6.1 5.7 5.3 4.9 4.6 4.3 4.1 3.9 3.7 Rev. A1: 12.12.1994 U 6044 B TELEFUNKEN Semiconductors Dimensions in mm Package: DIP 8 94 8873 Package: SO 8 94 8862 We reserve the right to make changes to improve technical design without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax Number: 49 ( 0 ) 7131 67 2423 Rev. A1: 12.12.1994 7