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LTC1255CS8 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1255CS8 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page ![]() 10 LTC1255 The switches can either be turned OFF by the controlling logic during these transients or latched OFF above 30V by holding the drain sense pin low as shown in Figure 9. Switch status can be ascertained by means of an XNOR gate connected to the input and switch output through 100k current limiting resistors (see Typical Applications section for more detail on this scheme). The switch is reset after the overvoltage event by cycling the input low and then high again. The power MOSFET switch should be selected to have a breakdown voltage sufficiently higher than the 40V supply clamp voltage to ensure that no current is conducted to the load during the transient. APPLICATIO S I FOR ATIO Figure 9. Overvoltage Transient Protection TYPICAL APPLICATIO S Dual Automotive High-Side Switch with Overvoltage Protection, XNOR Status and 12 µA Standby Current VS DS1 1/2 LTC1255 G1 GND IN1 IRF530 12V 1N5242B 14V RSENSE 0.036 Ω LTC1255 • F09 LOAD 100 Ω 10k 1k* D1 MR2535L 30V* 1N5256B FROM µP, ETC. + 1 µF 50V *OPTIONAL OVERVOLTAGE (30V) LATCH-OFF COMPONENTS VS DS2 LTC1255 IN2 GND DS1 IN1 G1 G2 MTD3055E 1N5400 14V MR2535L* 0.036 Ω LTC1255 • TA03 10k** 12V MMBZ5242B 100k 10k FAULT TO µP FROM µP, ETC. 100 Ω + 1 µF 50V FAULT TO µP FROM µP, ETC. 10k 100k 1N5400 12V MMBZ5242B 10k** MTD3055E 14V/1A SOLENOID 0.036 Ω 14V/1A SOLENOID 1/4 74C266 † LIMITS VS TRANSIENTS TO <40V. SEE MANUFACTURER DATA SHEET FOR FURTHER DETAIL. OPTIONAL OPEN LOAD DETECTION REQUIRES 10k PULL-UP RESISTORS. (ULTRA LOW STANDBY QUIESCENT CURRENT IS SACRIFICED) POWER FROM 5V LOGIC SUPPLY. * ** † IN 0 1 0 1 OUT 0 0 1 1 CONDITION SWITCH OFF OVERCURRENT OPEN LOAD** SWITCH ON FAULT 1 0 0 1 TRUTH TABLE 1/4 74C266 † |
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