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AN2815 Datasheet(PDF) 28 Page - STMicroelectronics

Part # AN2815
Description  High-efficiency step-down controller
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2815 Datasheet(HTML) 28 Page - STMicroelectronics

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PM6675AS demonstration tests
AN2815
28/42
9.5
VOUT efficiency
The three working modes lead to different power efficiency. The test setup is VIN=24 V,
FSW = 330 kHz, VOUT = 1.5 V. Figure 23 summarizes the results.
9.6
VOUT gate drivers
The PM6675AS internal MOSFET driver turns on and off the high-side and low-side
external MOSFET, avoiding cross-conduction. In the following two pictures the gates signals
are shown in two different load conditions: without load (Figure 24) and with load
(Figure 25).
Figure 23.
Forced PWM (blue), non-audible pulse-skip (green), pulse-skip (red),
efficiency vs. output current



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