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XC9223B81SR Datasheet(PDF) 10 Page - Torex Semiconductor

Part # XC9223B81SR
Description  1A Driver Transistor Built-In Step-Down DC/DC Converters
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Manufacturer  TOREX [Torex Semiconductor]
Direct Link  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC9223B81SR Datasheet(HTML) 10 Page - Torex Semiconductor

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XC9223/XC9224 Series
■OPERATIONAL EXPLANATION (Continued)
<Thermal Shutdown>
For protection against heat damage of the ICs, thermal shutdown function monitors chip temperature.
The thermal
shutdown circuit starts operating and the driver transistor will be turned off when the chip’s temperature reaches 150
OC.
When the temperature drops to 130
OC or less after shutting of the current flow, the IC performs the soft start function to
initiate output startup operation.
<Short-Circuit Protection>
The short-circuit protection circuit monitors FB voltage.
In case where output is accidentally shorted to the Ground and
when the FB voltage decreases less than half of the FB voltage, the short-circuit protection operates to turn off and to
latch the driver transistor.
In latch mode, the operation can be resumed by either turning the IC off and on via the CE pin,
or by restoring power supply to the VIN pin.
<Voltage Detector>
The detector block of the XC9223/9224 series detects a signal inputted from the VDIN pin by the VDOUT pin (N-ch
open-drain).
<U.V.L.O. Circuit>
When the VIN pin voltage becomes 1.8V (TYP.) or lower, the driver transistor is forced OFF to prevent false pulse output
caused by unstable operation of the internal circuitry.
When the VIN pin voltage becomes 2.0V (TYP.) or higher, switching
operation takes place.
By releasing the U.V.L.O. function, the IC performs the soft-start function to initiate output startup
operation.
The U.V.L.O. function operates even when the VIN pin voltage falls below the U.V.L.O. operating voltage for
tens of ns.
<MODE/SYNC>
A MODE/SYNC pin has two functions, a MODE switch and an input of external clock signal.
The MODE/SYNC pin
operates as the PWM mode when applying high level of direct current and the PFM/PWM automatic switching mode by
applying low level of direct current, which is the same function as the normal MODE pin.
By applying the external clock
signal (±25% of the internal clock signal, ON duty 25% to 75%), the MODE/SYNC pin switches to the internal clock signal.
Also the circuit will synchronize with the falling edge of external clock signal.
While synchronizing with the external clock
signal, the MODE/SYNC pin becomes the PWM mode automatically.
If the MODE/SYNC pin holds high or low level of the
external clock signal for several
μs, the MODE/SYNC pin stops synchronizing with the external clock and switches to the
internal clock operation.
(Refer to the chart below.)
・External Clock Synchronization Function
* When an input of MODE/SYNC is changed from “L” voltage into a clock signal of 1.2MHz and 50% duty.
MODE/SYNC
VOUT
50mV/div
2V/div
Lx
2V/div
1.0μs/div
1MHz
1.2MHz Duty50%
1.2MHz
Operates by the
internal clock
Synchronous with the
external clock
External Clock Signal
Delay time to the external clock synchronization


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