Datasheet TCKE805 (Toshiba) - 10

TCKE805 Series
Next, the timing chart of the overcurrent protection clamp operation of the latch type is shown in the figure below. This condition is maintained until the latch type is restarted by the control signals of the EN/UVLO terminal. However, the auto-retry type repeats the restoration attempt by stopping the operation → lowering the temperature → releasing the thermal shutdown → clamping the current → protecting the overheat → raising the temperature → protecting the overheat → Stopping the operation until the overcurrent is eliminated. Over-current Overcurrent detection elimination Restart with EN/UVLO H VEN/UVLO L VOUT ILIM IOUT
Timing chart of overcurrent protection operation (latch type) 3) Setting the overcurrent protection function
The following figure shows the relationship between output voltage and current during overcurrent protection clamp operation. ILIM ILIM High Accuracy Current Clamp
Output Voltage-Current Characteristics during Overcurrent Protection Clamp Operation
Toshiba eFuse IC has a variable current limit. By selecting the external resistor RILIM of the ILIM terminal appropriately, the current limit can be set to the optimum value for each application. The ILIM calculations are the same as those for the TCKE8 series, and are as shown below. However, the deviation between the theoretical value and the measured value is large when the current is 1A or higher. Be sure to check the resistance value with the actual machine when selecting the resistance value. RILIM: ILIM terminal external resistor (kΩ) The following is a diagram of the peripheral circuitry of the ILIM terminal and the relation between RILIM and ILIM. 10 2019-11-8 © 2019 Toshiba Electronic Devices & Storage Corporation