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L6563STR Datasheet(PDF) 23 Page - STMicroelectronics

Part No. L6563STR
Description  Enhanced transition-mode PFC controller
Download  42 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L6563STR Datasheet(HTML) 23 Page - STMicroelectronics

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L6563S
Application information
Doc ID 16116 Rev 3
23/42
6
Application information
6.1
Overvoltage protection
Normally, the voltage control loop keeps the output voltage Vo of the PFC pre-regulator
close to its nominal value, set by the ratio of the resistors R1 and R2 of the output divider. A
pin of the device (PFC_OK) has been dedicated to monitor the output voltage with a
separate resistor divider (R3 high, R4 low, see Figure 35). This divider is selected so that
the voltage at the pin reaches 2.5 V if the output voltage exceeds a preset value, usually
larger than the maximum Vo that can be expected.
Example: VO = 400 V, VOX = 434 V. Select: R3 = 8.8 MΩ; then: R4 = 8.8 MΩ ·2.5/(434-2.5) =
51 k
Ω.
When this function is triggered, the gate drive activity is immediately stopped until the
voltage on the pin PFC_OK drops below 2.4 V. Notice that R1, R2, R3 and R4 can be
selected without any constraints. The unique criterion is that both dividers have to sink a
current from the output bus which needs to be significantly higher than the bias current of
both INV and PFC_OK pins.
Figure 35.
Output voltage setting, OVP and FFP functions: internal block diagram


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