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PM6686 Datasheet(PDF) 28 Page - STMicroelectronics |
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PM6686 Datasheet(HTML) 28 Page - STMicroelectronics |
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28 / 50 page  Device description PM6686 28/50 Doc ID 15281 Rev 4 8.1.3 PWM PWM implements the continuous current mode (CCM). During TON, the high-side MOSFET is turned on and the inductor current starts increasing. When the Ton is elapsed the high- side MOSFET is turned off and after a dead time during which neither MOSFET conducts, the low-side MOSFET turns on. The inductor current decreases until these three conditions are verified: ● Output voltage reaches the regulation voltage ● Inductor current is below the current limit ● TOFFMIN is elapsed When these conditions are satisfied a new TON starts. PWM operation mode has a quasi-constant switching frequency, avoiding any audible noise issue and the continuous current mode assures better load transitions despite of a lower efficiency at light loads. Figure 47. Inductor current and output voltage in PWM mode Ton Toff Inductor current t Output voltage Vreg |
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