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AN2716 Datasheet(PDF) 7 Page - STMicroelectronics

Part # AN2716
Description  STCC08 application guidelines
PDF  28 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2716 Datasheet(HTML) 7 Page - STMicroelectronics

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AN2716
STCC08 description
Doc ID 14460 Rev 2
7/28
Figure 5.
STCC08 AVF output configuration
The IAVF current in the STCC08 AVF pin must be lower than 5 mA (IAVF_max). Equation 1
defines the minimal RAVF or pull-up resistor value to use. For example, with VCC_max = 5.5 V,
the RAVF or RPULL-UP resistor value must be higher than 1.1 kΩ to fulfill this condition.
Equation 1
The AVF signal toggles from VCC to GND according to the AC switch state and the AC line
(see Section 1.4.2). The RAVF or RPULL-UP resistor values modify the AVF signal rise time
(tR_AVF). This rise time increases with the MCU I/O pin capacitance and RAVF or
RPULL-UP resistors. To limit the influence of this delay on the AC switch state detection (see
Section 1.4.2) and on the ZVS detection application (see Section 4), a 300 k
Ω maximum
RAVF or RPULL-UP resistor value is recommended. With a 47 pF CL load capacitor and a
300 k
Ω maximum RAVF resistor, the AVF rise time is typically about 50 µs (see Figure 6).
Figure 6.
AVF signal rising time measurement information
AVF driver
MCU
VCC
VCC
AVF
GND
RAVF
STCC08
STCC08
IAVF
AVF driver
MCU
VCC
VCC
AVF
GND
STCC08
STCC08
IAVF
(a) AVF output loaded with an external resistor (R
)
AVF
(b) AVF output loaded with the MCU pull-up resistor (R
)
PULL-UP
max
AVF
max
CC
min
UP
PULL
min
AVF
I
V
R
or
R
_
_
_
_
>
-
(
)
mA
5
AVF
GND
AVF driver
VCC
AVF
RAVF
STCC08
STCC08
R AVF= 300 KΩ
C L= 47 pF
CL
90 % VCC
10 % VCC
tR_AVF
VAVF



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