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AN938 Datasheet(PDF) 15 Page - STMicroelectronics

Part # AN938
Description  The L4973 family is a 3.5 A monolithic DC-DC converter
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN938 Datasheet(HTML) 15 Page - STMicroelectronics

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AN938
Power supply, UVLO and voltage reference
Doc ID 5410 Rev 10
15/33
Figure 19.
Power stage internal circuit
The L4973 has been developed with a special focus on this dynamic area.
An innovative and proprietary gate driver with two different timings has been introduced.
When the diode reverse voltage reaches about 3 V, the gate is sourced with low current (see
Figure 18) to assure the complete recovery of the diode without generating unwanted extra
peak currents and noise.
After this threshold, the gate drive current is quickly increased, producing a fast rise time to
reach a high efficiency.
Figure 20.
Sync and oscillator waveforms as slave and as master
AM03502v1



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