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R1230D251B-TL Datasheet(PDF) 11 Page - RICOH electronics devices division |
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R1230D251B-TL Datasheet(HTML) 11 Page - RICOH electronics devices division |
11 / 20 page Rev. 1.12 - 11 - As for CIN, use a capacitor with low ESR (Equivalent Series Resistance) Ceramic type of a capacity at least 10 µF for stable operation. COUT can reduce ripple of Output Voltage, therefore as much as 10 µF tantalum type is recommended. s TIMING CHART Internal Oscillator Waveform Internal Operational Amplifier Output Internal Soft-start Set Voltage Lx Pin Output Soft-start Time Stable Output Short Delay Time of Protection Latched CE pin Voltage Output Short The timing chart as shown above describes the waveforms starting from the IC is enabled with CE and latched with protection. During the soft-start time, until the level is rising up to the internal soft-start set voltage, the duty cycle of Lx is gradually wider and wider to prevent the over-shoot of the voltage. During the term, the output of amplifier is “H”, then after the output voltage reaches the set output voltage, they are balanced with the stable state. Herein, if the output pin would be short circuit, the output of amplifier would become “H” again, and the condition would continue for 1.5ms (TYP.), latch circuit would work and the output of Lx would be latched with “OFF”. (Output =“High-Z”) If the output short is released before the latch circuit works (within 1.5ms after output shorted), the output of amplifier is balanced in the stable state again. Once the IC is latched, to release the protection, input “L” with CE pin, or make the supply voltage at UVLO level or less. s TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current 1.7 1.72 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 1.9 1 10 100 1000 Output Current IOUT[mA] Vin=3.3V PWM Vin=3.3V VFM Vin=5.0V PWM Vin=5.0V VFM R1230D181A |
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