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| Current-Monitoring IC Preliminary Data Features Input currents max 25 A, protective resistors can be connected in series Effective protection against destruction by excessive voltages such as load dump pulses occuring in cars Supply voltage range from 4.5 to 32 V Input voltage range up to 32 V, independent of supply voltage Switching threshold of comparators dependent on supply voltage, corresponding to the characteristic of light bulbs Temperature range: - 40 to 125 C Applications Current monitoring of light bulbs electric motors relays glow plugs circuits especially suitable for: automotive electronics industrial plants Type TLE 4951 TLE 4951 G Not for new design TLE 4951 Bipolar IC P-DIP-14-1 P-DSO-14-1 Ordering code Q67000-A8266 Q67000-A8267 Package P-DIP-14-1 P-DSO-14-1 (SMD) Semiconductor Group 1 09.94 TLE 4951 The TLE 4951 is designed to monitor the correct function of circuits, in particular those of light bulbs in cars. The IC comprises four identical comparator stages, the logic function of which corresponds to an exclusive-OR gate. With each comparator, pairs of lamps or single lamps can be monitored by means of the voltage drops across shunt resistors (Rsh) in the positive supply line (see application circuits 1 and 2). Due to small differential input currents it is possible to connect protective resistors (Rs) in series. This provides a high degree of protection against destruction by interfering voltages occuring in automobiles. Functional Description The component incorporates four identical comparator circuits. Each of these functional units has two equivalent inputs and one open-collector output Q. If the voltages differ by more than approx. 15 mV, the switching state changes from H (OFF-state) to L (ON-state). For an input voltage < 4.5 V at both the inputs, the output can switch to H independently of the differential input voltage. For an input voltage < 2.0 V the output is reliably OFF-state. Block Diagram Semiconductor Group 2 TLE 4951 TLE 4951 TLE 4951 G Pin Configurations (top view) Pin Definitions and Functions Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol Q1 IA1 IB1 Q2 IA2 IB2 0S Q3 IA3 IB3 Q4 IA4 IB4 VS Function Output 1 Input A1 Input B1 Output 2 Input A2 Input B2 GND Output 3 Input A3 Input B3 Output 4 Input A4 Input B4 Supply voltage Semiconductor Group 3 TLE 4951 Absolute Maximum Ratings Parameter Supply voltage Input voltages Output voltage Output current Current through protecting structures at the supply terminal at the outputs Q Thermal resistance system - air TLE 4951 system - air TLE 4951 G 1) Symbol VS V A, B VQ IQ IS I SQ R R th SA th SA Limit Values min. - 0.5 - 45 - 0.5 max. 32 45 32 40 - 600 - 400 600 400 75 125 Unit V V V mA mA mA K/W K/W 1) Remarks t d < 2 ms t d < 2 ms 75 K/W ceramic substrate Operating Range Parameter Supply voltage Ambient temperature Common-mode input voltage range independent of V S Differential input voltage Symbol min. VS TA V IC V ID 4.5 - 40 4.5 Limit Values max. 32 125 32 100 V C V mV Unit Permissible short-term overvoltages with series resistors R S: + V (V S; Q)= I S; Q x R V (V S; Q) + 32 V - V (V S; Q)= - I S; Q x R V (V S; Q) Semiconductor Group 4 TLE 4951 Characteristics T A = - 30 to 110 C; V S = 10 to 16 V Parameter Current consumption Switching threshold with R SA, B without R SA, B with R SA, B without R SA, B Input current Output saturation voltage Output reverse current 1) Symbol Limit Values min. typ. max. 3 8 7 4 2 1.5 14 8 20 12 14 8 25 0.4 10 Unit Test Condition Test Circuit IS mA mA mV mV mV mV A Q1 = Q2 = Q3 = Q4 = H 1 Q1 = Q2 = Q3 = Q4 = L V S = 13.5 V, R S = 1 k V S = 13.5 V 4.5 V < V S < 5.5 V, R S = 1 k 4.5 V < V S < 5.5 V VA=VB I Q = 30 mA V QH = 32 V 2 1 2 1 1 1 1 V Diff 1) V Diff 1) V Diff V Diff I A, B V QL I QH V A V Diff = I V A - V B I Semiconductor Group 5 TLE 4951 1. Differential measurement 2. Absolute-value measurement Application Circuits Semiconductor Group 6 TLE 4951 3. Supply from shunt resistor (function as "1": Differential measurement) 4. Voltage supply separated from vehicle electrical system (function as "1": Differential measurement) Applications Circuits (cont'd) Semiconductor Group 7 TLE 4951 Test Circuit 1 Test Circuit 2 Semiconductor Group 8 TLE 4951 Differential Switching Voltage versus Supply Voltage Parameters: protective resistors at the inputs R SA, B Semiconductor Group 9 |
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