Automotive Power

Constant Current Relay Driver TLE 4247EL40 Reduces Current Consumption of Magnetic Actuators

Application diagram of the TLE 4247 integrated into a relay housing

The amount of current a relay consumes is determined by the current applied to its coil. Yet although this current is permanently applied, it is only actually required during activation.

The AEC-Q100-qualified TLE 4247EL40 significantly reduces overall coil current consumption. It does this by minimizing the relay’s coil current after activation, keeping it at a level required to keep the relay activated (40-60mA) without EMI. This can occur when a relayis driven via PWM. The coil current remains the same regardless of battery voltage.

The TLE 4247 comes in a small, thermally enhanced PG-DSO-8 exposed pad package (RoHS) and can be mounted on a PCB inside a relay or on an ECU PCB with either a high-side or low-side switch.

High coil activation current Low hold current Suited to both low- and high-side switches PG-DSO-8 EP

Automotive relays (integrated into relay housing or mounted on ECU PCB) Automotive electromagnetic actuators (e.g. ignition key interlock)