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E-TEA3718SFP Datasheet(PDF) 6 Page - STMicroelectronics |
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E-TEA3718SFP Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 26 page Device diagrams 6/26 Table 2. Pin functions Name Function OUTB Output connection (with pin OUT A). The output stage is a "H" bridge formed by four transistors and four diodes suitable for switching applications. PULSE TIME A parallel RC network connected to this pin sets the OFF time of the lower power transistors. The pulse generator is a monostable triggered by the rising edge of the output of the comparators (toff = 0.69 RT CT). VS(B) Supply voltage input for half output stage GND Ground connection. In SO20 and power DIP these pins also conduct heat from die to printed circuit copper. VSS Supply voltage input for logic circuitry IN1 This pin and pin IN0 are logic inputs which select the outputs of three comparators to set the current level. Current also depends on the sensing resistor and reference voltage. See Table 8: Truth table. PHASE This TTL-compatible logic input sets the direction of current flow through the load. A high level causes current to flow from OUT A (source) to OUT B (sink). A Schmidt trigger on this input provides good noise immunity and a delay circuit prevents output stage short circuits during switching. IN0 See IN1 COMPARATOR INPUT Input connected to the three comparators. The voltage across the sense resistor is feedback to this input through the low pass filter RCCC. The lower power transistor are disabled when the sense voltage exceeds the reference voltage of the selected comparator. When this occurs the current decays for a time set by RT CT, Toff = 0.69 RT CT. REFERENCE A voltage applied to this pin sets the reference voltage of the three comparators. Reference voltage with the value of RS and the two inputs IN0 and IN1 determines the output current. VS(A) Supply voltage input for half output stage OUTA See pin OUT B SENSE RESISTOR Connection to lower emitters of output stage for insertion of current sense resistor ALARM When Tj reaches T1 oC the alarm output becomes low (TEA3718SP) PRE-ALARM When Tj reaches T2 oC the pre-alarm output becomes low (T2<T1) (TEA3718SFP) Table 3. Device comparison table Device Current Package Alarm Pre-alarm TEA3718SDP 1.5 A Power DIP 12+2+2 Not connected TEA3718SFP 1.5 A SO20 Connected TEA3718SP 1.5 A Multiwatt 15 Connected TEA3718DP 1.5 A Power DIP 12+2+2 Not connected |
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