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NJM3545TA2 Datasheet(PDF) 3 Page - New Japan Radio |
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NJM3545TA2 Datasheet(HTML) 3 Page - New Japan Radio |
3 / 9 page NJM3545 s FUNCTIONAL DESCRIPTION The circuit NJM3545 is a low side driver capable of driving resistive or inductive loads not exceeding 2 A. The driver has an error indicating function which generates an Error output signal when a fault condition has occurred. The circuits NJM3545 and NJM3548 are complementary drivers with equivalent functions and similar data. NJM3545 is a sink driver and NJM3548 is a source driver. Input stage The output stage is switched on and off according to the status of the input. HIGH level activates the output. If the input is left open, the circuit will accept it as a LOW level. Output stage The output stage contains a power transistor and two clamping diodes. The diodes are used for terminating line transients from inductive loads. If the driver is inactive and the output is shorted to GND the driver will leak maxi- mum 8 µA. See figure 18. Protection circuit The circuit contains two protection circuits: • Overload and Short circuit protection • Thermal protection The overload and short circuit protection will be activated at I out= 3.5 A typically at TJ= +25°C, see figure 20. The output will be turned off immediately and latched to a high-impedance state after an overload or short circuit has been detected. Figure 6. Output stage Figure 5. Input stage 5 I Ref GND Input 3 GND 3 1 2 CC Output Fault condition Input Output Error How to resume normal operation LOW=Error HIGH=Normal Normal 0 LOW 1 OFF 1 HIGH —— 1 HIGH 0 ON 1 HIGH —— V OUT Short to GND 0 LOW 1 OFF 0 LOW Remove fault condition. 1 HIGH 0 ON 0 LOW Remove fault condition. V OUT Short to VCC 0 LOW 1 OFF 1 HIGH —— 1 HIGH 1 OFF 0 LOW Turn off and on after fault condition is removed. Open load 0 LOW 1 OFF 1 HIGH —— 1 HIGH 0 ON 0 LOW Attach proper load to output or turn off the driver. Over temperature 0 LOW 1 OFF 1 HIGH —— T J=130 °C 1 HIGH 1 OFF 0 LOW Temperature is reduced to approx 120 °C, or turn off the driver. Figure 7. Error table |
Similar Part No. - NJM3545TA2 |
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Similar Description - NJM3545TA2 |
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