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LT1612 Datasheet(PDF) 7 Page - Linear Technology |
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LT1612 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LT1612 sn1612 1612fs OPERATIO Figure 3. Output Voltage Ripple is 20mVP-P for the Circuit of Figure 1 Burst Mode Operation Defeat To maintain high efficiency at light loads, the LT1612 will automatically shift into Burst Mode operation (MODE = 0V or floating). In this mode of operation the oscillator and switch drive circuitry is alternately turned on and off, reducing quiescent current to 160 µA. This reduces power consumption but also adds low frequency voltage ripple to the output. Figure 3 shows switching waveforms for a 5V to 3.3V converter running in Burst Mode operation. Output voltage ripple is approximately 20mVP-P. If the MODE pin is pulled high, Burst Mode operation will be inhibited and the oscillator runs continuously with no low frequency ripple at the output. See Figures 4 and 5. Figure 4. Transient Response for the Circuit of Figure 1 with the MODE Pin Tied to Ground or Floating Figure 5. With the MODE Pin Tied High, Low Frequency Output Voltage Ripple Is No Longer Present 1612 F03 VOUT 20mV/DIV AC COUPLED IL 200mA/DIV 5 µs/DIV 1612 F04 VOUT 200mV/DIV AC COUPLED ILOAD 10mA TO 310mA 0.1ms/DIV IL 200mA/DIV 1612 F05 VOUT 200mV/DIV AC COUPLED ILOAD 10mA TO 300mA 0.1ms/DIV IL 200mA/DIV |
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