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XCL205/XCL206/XCL207
Series
■ OPERATIONAL DESCRIPTION (Continued)
<Short-Circuit Protection>
The short-circuit protection circuit monitors the internal R1 and R2 divider voltage from the V OUT pin (refer to FB point in the
block diagram shown in the previous page). In case where output is accidentally shorted to the Ground and when the FB
point voltage decreases less than half of the reference voltage (Vref) and a current more than the I LIM flows to the driver
transistor, the short-circuit protection quickly operates to turn off and to latch the driver transistor. In the latch state, the
operation can be resumed by either turning the IC off and on via the CE/MODE pin, or by restoring power supply to the V IN
pin.
When sharp load transient happens, a voltage drop at the V OUT is propagated to the FB point through C FB , as a result, short
circuit protection may operate in the voltage higher than 1/2 V OUT voltage.
<UVLO Circuit>
When the V IN pin voltage becomes 1.4V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse
output caused by unstable operation of the internal circuitry. When the V IN pin voltage becomes 1.8V or higher, switching
operation takes place. By releasing the UVLO function, the IC performs the soft start function to initiate output startup operation.
The soft start function operates even when the V IN pin voltage falls momentarily below the UVLO operating voltage. The UVLO
circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended; therefore, the internal circuitry
remains in operation.
<PFM Switch Current>
In PFM control operation, until coil current reaches to a specified level (I PFM ), the IC keeps the P-ch MOSFET on. In this case,
on-time (t ON ) that the P-ch MOSFET is kept on can be given by the following formula.
t ON = L × I PFM / (V IN － V OUT ) → I PFM ①
<PFM Duty Limit>
In the PFM control operation, the PFM Duty Limit (DTY LIMIT_PFM ) is set to 200% (TYP.). Therefore, under the condition that the
duty increases (e.g. the condition that the step-down ratio is small), it’s possible for P-ch MOSFET to be turned off even when coil
current doesn’t reach to I PFM . → I PFM ②
Maximum IPFM Limit
t ON
Lx
I PFM
Lx
f OSC
I PFM
I Lx
I PFM ①
0mA
I Lx
I PFM ②
0mA
11/25
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