XC6216 Datasheet, PDF (20/45 Pages) Torex Semiconductor – Voltage Regullators with Stand-by Function-Input Voltage: 30V

XC6216/XE6216 Series
■ OPERATIONAL EXPLANATION
<Output Voltage Control>
The voltage divided by resistors R11 & R12 is compared with the internal reference voltage by the error amplifier. The
P-channel MOSFET which is connected to the VOUT pin is then driven by the subsequent controlled signal. The output
voltage at the VOUT pin is controlled and stabilized by a system of negative feedback. The current limit circuit and short
protect circuit operate in relation to the level of output current and heat dissipation. Further, the IC’s internal circuitry
can be shutdown via the CE pin’s signal.
<Short-Circuit Protection>
The XC6216/XE6216 series includes a current fold-back circuit as a short circuit protection. When the load current reaches
the current limit level, the current fold-back circuit operates and output voltage drops. The output voltage drops further and
output current decreases. When the output pin is shorted, a current of about 30mA flows.
<CE Pin>
The IC’s internal circuitry can be shutdown via the signal from the CE pin with the XC6216/XE6216 series. In shutdown
mode, output at the VOUT pin will be pulled down by R11 and R12 to the VSS level. Note that as the XC6216/XE6216 series
has no pull down resistor so that it will become unstable with the CE pin open. We suggest that you use this IC with either a
VIN voltage or a VSS voltage input at the CE pin. If this IC is used with the correct specifications for the CE pin, the
operational 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 if a medium voltage is applied.
<Thermal Protection>
When the junction temperature of the built-in driver transistor reaches the temperature limit, the thermal shutdown circuit
operates and the driver transistor will be set to OFF. The IC resumes its operation when the thermal shutdown function is
released and the IC’s operation is automatically restored because the junction temperature drops to the level of the thermal
shutdown release voltage.
<Minimum Operating Voltage>
For the stable operation of the IC, over 2.0V of input voltage is necessary. The output voltage may not be generated
normally if the input voltage is less than 2.0V.
■ NOTES ON USE
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 the noise and/or phase lag depending on output
current. Please strengthen VIN and VSS wiring in particular.
3. Phase compensation inside the IC is performed in the XC6216/XE6216 series. Therefore, an abnormal oscillation does not
occur even if there is no output capacitor CL. An input capacitor CIN around 0.1μF~1.0μF between the power input pin
(V_IN) and the ground pin (V_SS) is required for input stability. Also, the output voltage fluctuation such as under shoot or
over shoot, which occurs because of the load change can be controlled by placing the output capacitor C_L around 0.1μ
F~1.0μF between the VOUT pin and VSS pin. The input capacitor (CIN) and the output capacitor (CL) should be placed to
the IC as close as possible with a shorter wiring.
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