Datasheet

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March 2008 Rev 3 1/19

L6374

Industrial quad line driver

Features

■ Four independent line drivers with 100 mA up

to 35 V outputs

■ Input signals between - 7 V and + 35 V, with

pre-setting threshold

■ Push-pull outputs with three state control and

true zero current between Vs and ground

■ Current limiting on each output effective in the

full "ground to Vs" output voltage range

■ Output voltage clamp to Vs and to ground

■ Overtemperature and undervoltage protections

■ Diagnostic for overtemperature, undervoltage

and overcurrent

■ Pre-setting delay for overcurrent diagnostic

■ High speed operation: up to 300 kHz with 35 V

swing

Description

The L6374 is especially designed to be used as a

line driver in industrial control systems based on

the 24 V signal levels (IEC 61131, 24VDC).

Table 1. Device summary

Order codes Package Packaging

L6374FP SO-20 Tube

L6374FPT SO-20 Tape and reel

SO-20

Figure 1. Block diagram

www.st.com

Summary of content (19 pages)

PAGE 1
L6374 Industrial quad line driver Features ■ Four independent line drivers with 100 mA up to 35 V outputs ■ Input signals between - 7 V and + 35 V, with pre-setting threshold ■ Push-pull outputs with three state control and true zero current between Vs and ground ■ Current limiting on each output effective in the full "ground to Vs" output voltage range Description ■ Output voltage clamp to Vs and to ground ■ Overtemperature and undervoltage protections The L6374 is especially designed to be us
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Contents L6374 Contents 1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 Thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 RthJP . . . . . . . . . . . . . . . . . . . . .
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L6374 1 Maximum ratings Maximum ratings Table 2. Absolute maximum ratings Symbol Pin VS 1 Vilog 12, 13 Value Unit Supply voltage (tW ≤ 10 ms) 50 V Supply voltage (DC) 40 V -0.3 to 7 V ±1 mA ±2 mA - 7 to 35 V ±100 mA ±1 A -0.3 to VS +0.3 V Setting pin forced current ±1 mA Setting pin forced voltage -0.3 to 5 V External voltage -0.3 to 35 V Externally forced current -10 to 10 mA Voltage on the delay capacitor, externally forced -0.3 to 4.
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Electrical characteristics L6374 3 Electrical characteristics Table 3. Electrical characteristics Symbol Pin Parameter Test condition Min Typ Max Unit 10.8 35 V 9 10.8 V 450 650 mV 3 5 mA DC operation (VS = 24 V; TJ = -25 to 125 °C; unless otherwise specified) VS Vsh Supply voltage UV upperthreshold 1 Hys1 UV hysteresis Iqsc Quiescent current Outputs open Vref Input comparators reference voltage Reference pin floating 1.05 1.25 1.
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L6374 Table 3. Symbol Electrical characteristics Electrical characteristics (continued) Pin Parameter Test condition Min Typ Max Unit AC operation (VS = 10.
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Thermal characteristics 4 Thermal characteristics Table 4. Symbol 4.1 L6374 Thermal data Parameter Value Unit RthJP Thermal resistance, junction to pin 17 °C/W RthJA1 Thermal resistance, junction to ambient (see thermal characteristics) 65 °C/W RthJA2 Thermal resistance, junction to ambient (see thermal characteristics) 80 °C/W RthJP The reference point is the knee on the four central pins, where the pins are upwardly bent and the soldering joint with the PCB footprint can be made. 4.
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L6374 Thermal characteristics Figure 3.
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Overtemperature protection (OVT) 5 L6374 Overtemperature protection (OVT) If the chip temperature exceeds Th (measured in a central position in the chip) the chip deactivates itself. The following actions are taken: ● all the output stages are forced in the "three state" condition, i.e. are disconnected from the output pins; only the clamping diodes at the outputs remain active; ● the signal Diag is activated (active low).
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L6374 7 Diagnostic logic Diagnostic logic The situations that are monitored and signalled with the Diag output pin are: 8 ● current limit (OVC) in action; there are 8 individual current limiting circuits, two per each output, i.e.
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State / push-pull input 10 L6374 State / push-pull input The input 3st/Pp is instead intended for a digital incoming signal. It has an internal threshold set at 1.26 V; an internal bias circuit (10 mA typical) simulates a high level (three-state) if the pin is disconnected. Figure 4. Equivalent input circuit Figure 5.
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L6374 11 The switching of the output stage The switching of the output stage The cross conduction of the two transistors of an output stage of the L6374 would be significantly noisy, because the transistors here can carry peak currents in excess of 100 mA, and even more in the few nanoseconds before the current limiting circuits are really effective. Consequently the device has been designed so as to avoid such cross conduction.
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The switching of the output stage L6374 switching when the inductor can discharge; while the switching looks "delayed" if the output transition tends to initiate a charging phase (see Figure 9). With a load almost free from parasitic elements, the waveforms resemble the ones of the purely resistive cases. With a real, more composite load, the effect of the inductive kick in comparison to the resistive load, would be more apparent.
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L6374 The switching of the output stage Figure 8. VS = 35 V, 350 Ω connected to VS Figure 9. VS = 35 V, 350 Ω and 1 mH connected to ground.
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The switching of the output stage L6374 Figure 10. VS = 35 V, 350 Ω || 1 nF connected to ground. Figure 11. Switching waveforms.
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L6374 12 Application note Application note It is recommended not to leave the Ref pin (pin 11) floating: if not used with an external voltage reference, it is better to connect an external capacitor (of at least 10 nF) between this pin and ground. This capacitor filters the voltage reference against voltage spikes that can be generated by the commutation of the output stages.
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Package mechanical data 13 L6374 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark.
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L6374 Package mechanical data Table 5. SO-20 mechanical data mm inch Dim. Min Typ Max Min Typ Max A 2.35 2.65 0.093 0.104 A1 0.1 0.3 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.6 13 0.496 0.512 E 7.4 7.6 0.291 0.299 e 1.27 0.050 H 10 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 L 0.4 1.27 0.016 0.050 K 0° (min.)8° (max.) Figure 12.
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Revision history 14 L6374 Revision history Table 6. 18/19 Document revision history Date Revision Changes August 2003 1 First Issue June 2004 2 Technical migration from ST-PRESS to EDOCS.
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L6374 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.