TDE1708DFT

TDE1708DFT Intelligent power switch Features ■ Low side or high side switch configuration ■ 6 V to 48 V supply voltage range ■ Overload and short circuit protections ■ Internal voltage clamping ■ Supply and output reversal protection ■ Thermal shutdown ■ GND and VS open wire protection ■ Adjustable delay at switch on ■ Indicator status led driver ■ +5 V regulated aux. voltage ■ High burst immunity Description The TDE1708DFT is an integrated power switch with up to 48 V power supply capability. Two output configurations are possible: Load to GND (high side mode) Load to VS (low side mode) Especially dedicated to proximity detectors, its internal +5 V supply can be used to supply external circuits (See also AN495). Table 1. DFN (4x4) A signal is internally generated to block the In signal, and prevent activation of the output switch, as long as an abnormal condition is detected. The power-on transition, as well as the chip over temperature and the output overcurrent, concur to the generation of such signal. A minimum delay of 25 ms (Typ. value) is added to the trailing edge of such signal to ensure that a stable normal situation is present when the signal disappears. The delay (of the disappearance of the block signal; no delay at its on set) can be further increased connecting a capacitor between pin3 and ground. It can drive resistive or inductive loads. Device summary Order code Temp. range, °C Package Packing TDE1708DFT -25 °C to +85 °C DFN (4x4) Tape and reel February 2009 Rev 4 1/14 www.st.com 14 Contents TDE1708DFT Contents 1 Block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 2.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.4 Dynamic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 4 5 2/14 Adjustable input hysteresis circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.1 Foot print recommended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.2 DFN (4x4) mechanical data and package dimensions . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 TDE1708DFT 1 Block and pin connection diagrams Block and pin connection diagrams Figure 1. Block diagram 3/14 Block and pin connection diagrams TDE1708DFT Figure 2. Pin connection diagram (top view) Table 2. Pin functions Pin No Note: 4/14 Function 1 Led driver 2 High side output 3 Delay capacitance source 4 Ground 5 Input 6 Reg. voltage source 7 Supply voltage 8 Low side output Lead frame can be connected to ground. TDE1708DFT Electrical specifications 2 Electrical specifications 2.1 Thermal data Table 3. Thermal data Symbol Description RthJA Thermal resistance junction-ambient. (max) RthJC Thermal resistance junction-case. (max) Value Unit 32(1) °C/W 1.2 °C/W Value Unit 1. Soldered to a 4 layer board with 4 vias in the pad. 2.2 Absolute maximum ratings Table 4. Absolute maximum ratings Symbol Parameter VS Supply voltage 50 V VS Supply reverse voltage 50 V Io Output current internally limited A Vreg Regulated voltage pin 0 to 7 V Vdelay Delay cap. source pin 0 to 5 V 55 V -10 to 50 V Internally limited °C -55 to 150 °C internally limited mW 100 mJ Vo Output dif. voltage Vi Input voltage TJ Junction operating temperature Tstg Storage temperature range Ptot Power dissipation Ei Energy inductive load 5/14 Electrical specifications TDE1708DFT 2.3 Electrical characteristics Table 5. Electrical characteristics (VS = 24 V; TJ = - 25 to +85 °C unless otherwise specified) Symbol Parameter Test conditions Min Typ Unit 48 V Vs Supply voltage Isr Supply reverse current VSR = –48 V 1.5 mA Iq Quiescent current Ireg = Iled = 0; Vi < 2 V; VS = 6 to 48 V 1.5 mA Io Output current Vs = 6 to 48 V 250 mA Output voltage drop Io = 200 mA 1 1.5 V Vsat 6 Max ISCLS Short circuit current in low side configuration 0.3 0.4 0.6 A ISCHS Short circuit current in high side configuration 0.25 0.3 0.40 A 70 V 300 100 μA μA 3 V Vcl Internal voltage clamp ICL = 10 mA Iolk Output leakage (Pin 2) Vi < 2 V; Vo = 0 to Vs (Pin 8) Vith Input voltage threshold Vihis Input threshold hysteresis Ilk 300 Vi = 5 V Vreg Regulated output voltage Ireg < 5 mA Iscr Short circuit regulated Ireg Output regulator current Vs = 35 V Vs = 48 V Iold Current source sink led driver Output ON (±) Vold Voltage drop led driver Ios = 2 mA (±) Oldlk LED driver (off) Leak. Vi < 2 V; RL < 1 kΩ Del. cap. charge current Vdth Delay voltage trigger TTSD Thermal shutdown temperature 6/14 100 2 Input current Idch 55 2 5 μA 4.5 5 5.5 V 6 30 50 mA 6 4 mA mA 3 4 mA 1.2 1.6 V 10 μA 6 μA 2 2 TJ = 25 °C mV 4 4 V 180 °C TDE1708DFT Electrical specifications 2.4 Dynamic information Table 6. Dynamic information (VS = 24 V; TJ = 25 °C; RL = 48 Ω) Symbol Parameter ton Propagation turn on time toff Propagation turn off time tdon Delayed turn on time / nF delay capacitor td min Minimum delayed ton Delay capacitor = 0 Test conditions Min Vi = 0 to 5V 0.65 Typ Max Unit 15 μs 15 μs 1 25 2 ms μs 7/14 Application information 3 TDE1708DFT Application information The LED driver tells the output status. It can source or sink current (Iold typ = 3 mA), according to the output configuration chosen. The thresholds, represented by the output comparator in the block diagram, are set at about 1.5 V - 2 V. For instance, in the high side load case of the Application Circuit, when the voltage on pin 8 (the output) differs from VCC less than 1.5 V, the output is sensed in “OFF” state and the LED driver is disabled. If instead pin 8 differs from VCC more than 3 V (the output comparator threshold value plus the drop voltage on the LED), then the output is sensed “ON” and the driver will force the current on the LED. Figure 3. Low side driver topology TDE1708DFT 8/14 Figure 4. High side driver topology TDE1708DFT TDE1708DF TDE1708DFT 3.1 Application information Adjustable input hysteresis circuit The TDE1708DFT is a device realized in bipolar technology and therefore it has the usual problems of temperature compensation that such technology involves; despite all it maintains an input dynamics within 1 V over industrial temperatures range. In all input voltage range it will guarantee a high impedance of 1 MΩ determining an input current about 2 µA. Exploiting this input high impedance is possible connects a sensor directly on it and bypass the obstacle of active signal conditioning circuit using a voltage firm point as ground of sensor, the delay capacitor, connected on the pin 3, as low pass filter and capacitor on Vreg pin to minimize the noise on it and protect for errors the low-voltage internal circuits, according AN495. In Figure 5. the input external network is optimized for accepting both a sensor with ground connected to the body and a sensor with independent ground. In order to ground the body of the sensor, J1 has to be shorted, while J2 opened and connect the sensor on M3; in case of independent ground J1 must be opened, J2 shorted and the sensor connected on M4. DL1 indicate commutation status of the device output and C3 realize a simple output filtering in case is used an inductive load. With C2 about 10 nF we obtain a good filtering and immunity from input voltage noise. C4 is 4,7nF according AN495. R2 is an optional resistor plugged only when the sensor needs to adapt its impedance with the input impedance of device. Figure 5. Application circuit for adjustable input hysteresis TDE1708DFT 9/14 Package mechanical data 4 TDE1708DFT Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark. 4.1 Foot print recommended Figure 6. 10/14 Foot print TDE1708DFT 4.2 Package mechanical data DFN (4x4) mechanical data and package dimensions Table 7. Package dimensions mm Dim. Typ Min Max A 0.90 0.80 1 A1 0.02 0 0.05 A3 0.20 b 0.30 0.23 0.38 D 4 3.90 4.10 D2 3 2.82 3.23 E 4 3.90 4.10 E2 2.20 e 0.80 L 0.50 2.30 0.40 0.60 11/14 Package mechanical data Figure 7. TDE1708DFT Package dimension Top view Bottom view Sitting plane 12/14 TDE1708DFT 5 Revision history Revision history Figure 8. Document revision history Date Revision Changes 26-Jun-2006 1 Initial release. 31-Oct-2006 2 Updated package in cover page, inserted low/high side ISC in Table 5. 09-Jan-2007 3 Updated ISCHS in Table 5 on page 6. 27-Feb-2009 4 Updated cover page 13/14 TDE1708DFT 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. 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