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AN2708 数据表(PDF) 13 Page - STMicroelectronics

部件名 AN2708
功能描述  2X36 W digital dimmable ballast with L6574 and ST7FDALI
PDF  42 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN2708 数据表(HTML) 13 Page - STMicroelectronics

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AN2708
High-frequency ballast
13/42
The PFC preregulator performances are shown in the following graphs:
Figure 4.
PFC performances at 230 Vac-50 Hz
Table 6.
L6562 biasing circuitry design equations
Pin 1 (INV)
Pin 2 (COMP)
Pin 3 MULT
Pin 4 (CS)
A RC-C network is
placed between this
pin and pin 1, leading
to a low crossover
frequency (some tens
of hertz) as well as to
an adequate phase
margin.
A small capacitor of 10 nF
filters the signal on MULT pin.
Pin 5 (ZCD)
Pin 6 (GND)
Pin 7 (GD)
Pin 8 Vcc
IC ground. As a layout
hint, this pin has to be
kept separated from
power ground. All the
IC signals have to be
referred to this pin.
Gate driver.
A "bleeder" resistor between
the gate and the source is
used to avoid undesired
switch-on, without affecting
the power consumption.
The supply voltage is
provided by a capacitive
power supply connected to
the half-bridge inverter.
∆OVP
R
high
40
10
6
–
⋅⋅
=
V
out
2.5
R
high
R
low
+
()
R
low
-------------------------------------------
⋅
=
Rlow
V
MULTpkx
250
10
6
–
⋅
--------------------------------
2.5
250
10
6
–
⋅
------------------------------
=
=
R
low
R
low
R
high
+
--------------------------------------
2.5
2V
inrmsmax
⋅
------------------------------------------------
=
R
sense
1.65
2.5
V
inrmsmin
V
inrmsmax
---------------------------------
⋅
⎝⎠
⎜⎟
⎛⎞
⋅
22
I
inrms
⋅⋅
-------------------------------------------------------------------------
≤
Pd
Rs
I
2
Qrms
⋅
=
m
Vout
2
V
inrmsmax
⋅
–
()
2.1
1.15
⋅
------------------------------------------------------------------------
=
R6
Vout
2
V
inrmsmin
⋅
–
()
m3
10
3
–
⋅⋅
-----------------------------------------------------------------------
≥
R
start
V
inrmsmin
2
⋅
I
startup
----------------------------------------------
=
CH1 (yellow): rectified input voltage
CH2 (blue): input current



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