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XC9515BD10ZL Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC9515BD10ZL Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 21 page 11/21 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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