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XC92061L6MR Datasheet(PDF) 9 Page - Torex Semiconductor |
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XC92061L6MR Datasheet(HTML) 9 Page - Torex Semiconductor |
9 / 15 page XC9206 / 9207/ 9208 Series PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In # Application Information (Continued) Ipk = (VIN - VOUT) x On Duty / (2 x L x FOSC) + IOUT OnDuty : OnDuty ratio of Pch Driver Transistor L : Coil Inductance Value FOSC : Oscillation Frequency $ The increase of ripple voltage (1.2MHz) 1 VIN=4.2V, VOUT=1.8V, IOUT=180mA 2 VIN=4.2V, VOUT=1.8V, IOUT=60mA 3 VIN=3.6V, VOUT=1.8V, IOUT=30mA L : 4.7µH CDRH3D16 SUMIDA SD : CRS02 TOSHIBA CIN : 4.7µF Ceramic CL : 10µF Ceramic 7. When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance. 5. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when dropout voltage or load current is high, current limit starts operating, and this can lead to instability. When peak current becomes high, please adjust the coil inductance value and fully check the circuit operation. In addition, please calculate the peak current according to the following formula: 6. When the peak current which exceeds limit current flows within the specified time, the built-in Pch driver transistor is turned off. During the time until it detects limit current and before the built-in transistor can be turned off, the current for limit current flows; therefore, care must be taken when selecting the rating for the coil or the schottky diode. 9. Use of the IC at voltages below the recommended voltage range may lead to instability. 10. This IC should be used within the stated absolute maximum ratings in order to prevent damage to the device. 8. Care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. Depending on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, the board should be laid out so that capacitors are placed as close to the chip as possible. Semiconductor Ltd. CH1:Lx CH2:VOUT AC-COUPLED CH1:Lx CH2:VOUT AC-COUPLED CH1:Lx CH2:VOUT AC-COUPLED 11. Depending on the input-output voltage differential, or load current, some pulses may be skipped, and the ripple voltage may increase. When the series' duty cycle is digitally signalized, the linear duty cycle and the digitally signalized duty cycle cannot carry out completely the same change, which means that the duty cycle does not change linearly. The output is stabilized by applying the phase compensation and adjusting the duty cycle, even when the duty cycle loses the linear change in the whole circuit. When the state where the output was stabilized is continued by applying phase compensation to duty cycle which lost linearity, ripple voltage does not increase more than it. The ripple voltage may increase to about several 10mV according to operating conditions. It is possible, by increasing the capacitance values, to reduce the ripple voltage. The operating conditions are greatly influenced by the dropout voltage, the load current, the delay-time, or the external components, such as the coil inductance, and the capacitance values. Verification with actual parts should be done. Data Sheet 9 |
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