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AN3372 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN3372
Description  This note describes digital ballast for 70 W HID lamps
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3372 Datasheet(HTML) 6 Page - STMicroelectronics

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General circuit description
AN3372
6/37
Doc ID 018625 Rev 1
Figure 3.
Inductor current during charge phase
When the PMOS Ls is switched OFF, the current goes into freewheeling mode in the high-
side device.
The voltage across the inductor is:
Equation 2
The current through L in this phase decreases linearly. This circuit is actually a rectifier buck
converter.
Figure 4.
Inductor current during discharge phase
To invert the current in the lamp, the two PMOS work in a complementary way: Hs PMOS is
driven and the freewheeling phase is in the Ls PMOS.
lamp
L
V
V
−
=



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