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LM3668QDNTRQ1 Arkusz danych(PDF) 11 Page - Texas Instruments |
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LM3668QDNTRQ1 Arkusz danych(HTML) 11 Page - Texas Instruments |
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11 / 24 page  VOUT (Target) Buck or Boost Boost Buck Region I Region II Region III VIN dV1 - VOUT (TARGET) VOUT (TARGET) + dV2 High PFM Threshold ~1.016*Vout Low1 PFM Threshold ~1.008*Vout PFM Mode at Light Load PWM Mode at Moderate to Heavy Loads Inductor Current Ramp up Inductor current ramp down until I inductor=0 High PFM Voltage Threshold reached, go into Low power mode, both switches are off Low PFM Threshold, turn on Current load increases, draws Vout towards Low2 PFM Threshold Low2 PFM Threshold, switch back to PWMmode Load current increases Low2 PFM Threshold Vout LM3668-Q1 www.ti.com SNVSA84A – APRIL 2015 – REVISED MAY 2015 Device Functional Modes (continued) Figure 9. PFM to PWM Mode Transition In addition to the auto mode transition, the LM3668-Q1 operates in PFM Buck or PFM Boost based on the following conditions. There is a small delta (approximately 500 mV) known as dv1 (approximately 200 mV) and dv2 (approximately 300 mV) when VOUT_TARGET is very close to VIN where the device can be in either Buck or Boost mode. For example, when VOUT_TARGET = 5 V and VIN is between 4.5 V and 5.5 V, the LM3668-Q1 can be in either mode depending on the VIN vs VOUT_TARGET. • Region I: If VIN < VOUT_TARGET – dv1, the regulator operates in Boost mode. • Region II: If VOUT_TARGET – dv1 < VIN < VOUT_TARGET+ dv2 ,the regulator operates in either Buck or Boost mode. • Region III: If VIN > VOUT_TARGET + dv2, the regulator operates in Buck mode. Figure 10. VOUT vs VIN Transition Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3668-Q1 |
Podobny numer części - LM3668QDNTRQ1 |
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Podobny opis - LM3668QDNTRQ1 |
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