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XC9515BC05ZR Datasheet(PDF) 11 Page - Torex Semiconductor

Part # XC9515BC05ZR
Description  2 channel Synchronous Step-Down DC/DC Converter with Manual Reset
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Manufacturer  TOREX [Torex Semiconductor]
Direct Link  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC9515BC05ZR Datasheet(HTML) 11 Page - Torex Semiconductor

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XC9515
Series
●Release Delay
Ta=25
oC
Delay Capacity Cd [μF]
Release Delay tDR (TYP.) [ms]
Release Delay tDR (MIN.∼MAX.) [ms]
0.01
17
10∼24
0.022
38
23∼53
0.047
81
49∼113
0.1
173
103∼242
0.22
380
228∼532
0.47
811
487∼1135
1
1725
1035∼2415
■OPERATIONAL EXPLANATION (Continued)
<Thermal Shutdown>
For protecting the IC from heat damage, the thermal shutdown circuit monitors the chip temperature. When the chip
temperature reaches 150℃, the thermal shutdown circuit operates and the driver transistor will be set to OFF. As the chip
temperature drops to 130℃ by stopping current flow, the soft-start function operates to turn the output on.
<Short-Circuit Protection>
The short-circuit protection circuit monitors the FB voltage.
If the output is shorted incorrectly with the ground, the
short-circuit protection circuit operates and turns the driver transistor off to latch when the FB voltage becomes less than half
of the setting voltage. Both two DC/DC blocks stop operations when either CH1 or CH2 of protection circuit is activated. At
this time, both Lx1 and Lx2 become high impedance. Once the IC is in latch mode, operations can be resumed by either
turning the IC off after letting both ends of EN1 and EN2 pins down to low level, or by restoring power. (The P_VDD1 and
P_VDD2 voltages should be less than the low level of the EN1 and EN2 pins when restoring power.)
<Soft Start Function>
The soft-start circuit protects against inrush current, when the power is switched on, and also to protect against voltage
overshoot. It should be noted, however, that this circuit does not protect the load capacitor (CL) from inrush current. With
the Vref voltage limited and depending upon the input to the error amps, the operation maintains a balance between the two
inputs of the error amps and controls the EXT1 pin's ON time so that it doesn't increase more than is necessary.
<UVLO Circuit>
When the VIN pin voltage becomes1.8V (TYP.) or lower (for XC9515A, 2.7V 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 VIN pin voltage
becomes 1.9V (TYP.) or higher (for XC9515A, 3.0V or lower), switching operation takes place. By releasing the UVLO
function, the IC performs the soft-start function to initiate output startup operation.
<Voltage Detector Block>
The series' detector function monitors the voltage divided by resistors connected to the P_VDD1 pin, as well as monitoring the
voltage of the internal reference voltage source via the comparator. Because of hysteresis at the detector function, output at
the VDOUT pin will invert when the sense pin voltage of the detector block (P_VDD1) increases above the release voltage (105%
of the detect voltage). The output configuration of the VDOUT pin is N-channel open drain, therefore, a pull-up resistor is
required. The voltage detector block has a manual reset (MR) pin. By setting the MR pin at low level, the VDOUT pin is forced
to be at low level.
By connecting a capacitor (Cd) to the Cd pin, the XC9515 series can set a delay time to VDOUT pin’s output signal when
releasing voltage. The delay time can be calculated from the internal resistance, Rdelay (2.5MΩ fixed TYP.) and the
value of Cd as per the following equation. As selecting the capacitor (Cd), the delay time can be set freely.
tDR (Delay time) =Cd x Rdelay x 0.69


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