ZHCSK76 September 2019 LM74202-Q1
PRODUCTION DATA.
The device responds differently to overload and short circuit conditions. The operational differences are explained in Table 3.
| Mode Pin Configuration | Mode Connected To RTN (Current Limit With Auto-Retry) | A 402-KΩ Resistor Connected Between Mode And RTN Pins (Current Limit With Latchoff) | Mode Pin = Open |
|---|---|---|---|
| Start-up | Inrush current controlled by dVdT | ||
| Inrush limited to I(OL) level as set by R(ILIM) | Inrush limited to I(OL) level as set by R(ILIM) | Inrush limited to I(OL) level as set by R(ILIM) | |
| Fault timer runs when current is limited to I(OL) | |||
| Fault timer expires after tCB(dly) causing the FETs to turnoff | |||
| If TJ > T(TSD), device turns off | If TJ > T(TSD), device turns off | Device turns off if TJ > T(TSD) before timer expires | |
| Overcurrent response | Current is limited to I(OL) level as set by R(ILIM) | Current is limited to I(OL) level as set by R(ILIM) | Current is allowed through the device if I(LOAD) < I(FASTTRIP) |
| Power dissipation increases as V(IN) – V(OUT) increases | Power dissipation increases as V(IN) – V(OUT) increases | Fault timer runs when the current increases above I(OL) | |
| Fault timer expires after tCB(dly) causing the FETs to turnoff | |||
| Device turns off when TJ > T(TSD) | Device turns off when TJ > T(TSD) | Device turns off if TJ > T(TSD) before timer expires | |
| Device attempts restart 540 ms after TJ < [T(TSD) – 10°C] | Device remains off | Device attempts restart 540 ms after TJ < [T(TSD) – 10°C]. | |
| Short-circuit response | Fast turnoff when I(LOAD) > I(FASTRIP) | ||
| Quick restart and current limited to I(OL), follows standard start-up | |||