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PM6686 데이터시트(PDF) 28 Page - STMicroelectronics

부품명 PM6686
상세설명  Constant ON-time control
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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PM6686 데이터시트(HTML) 28 Page - STMicroelectronics

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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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