XC6221_1 datasheet(9/23 Pages) TOREX

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XC6221

Series

■OPERATIONAL EXPLANATION (Continued)

The XC6221 series’ foldback circuit operates as an output current limiter and a short protection of the output pin. When

the load current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. When

the output pin is shorted to the VSS level, a current of about 30mA flows.

The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6221 series. In shutdown mode,

output at the VOUT pin will be pulled down to the VSS level via R1 & R2. However, as for the XC6221B series, the CL

auto-discharge resistor is connected in parallel to R1 and R2 while the power supply is applied to the VIN pin.

Therefore, time until the VOUT pin reaches the VSS level becomes short. The output voltage becomes unstable, when

the CE pin is open. If this IC is used with the correct output voltage for the CE pin, the logic is fixed and the IC will

operate normally. However, supply current may increase as a result of through current in the IC's internal circuitry when

medium voltage is input.

1. Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be

exceeded.

2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output

current. Please wire the input capacitor (CIN) and the output capacitor (CL) as close to the IC as possible.

■NOTES ON USE

XC6221 Datasheet(PDF) 9 Page - Torex Semiconductor