参数资料
| 型号： | IRPLMB1E |
| 厂商： | International Rectifier |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | KIT DESIGN BALLAST 220VAC |
| 标准包装： | 1 |
| 其它名称： | *IRPLMB1E |
IRPLMB1E
10. Design Procedure to adapt the design
to different lamps types
The design with the IR2520D is very simple because
it only has 2 control pins: VCO (0-5VDC oscillator
voltage input) and FMIN (minimum frequency set-
ting). To modify the design for a higher lamp power,
you will need to modify RFMIN, CVCO, LRES and
CRES. Make sure that FETs and inductors are rated
to the current you need with the new lamp and that
VCC is stable. To modify the design to a lower lamp
power, you will need to decrease RFMIN and only in
some case to modify also CVCO, LRES and CRES.
In most cases you can use FETs and inductors with
lower current ratings.
The suggested design procedure is as follows:
1) Use the BDA software to calculate LRES
and CRES.
Select the input configuration without PFC,
select the IR2156 IC and select single lamp
current mode configuration. Select the new
lamp in the database or add the lamp pa
rameters by hand selecting the “Advanced”
option.
Calculate the operating point and chose the
right values of L and C that satisfy:
1.1) Run frequency (best working range) 40-
50KHz
1.2) C as small as possible to minimize
losses (suggested value 4.7nF)
1.3) L values you have available
Pin FMIN is connected to ground through a resistor
(RFMIN). The value of this resistor programs the mini-
mum frequency (fmin) of the IC and the starting fre-
quency of the IC (2.5xfmin). The IR2520 will work in
run mode at the minimum frequency unless non-
ZVS is detected. Generally, to work with constant fre-
quency, the minimum frequency needs to be chosen
above the resonant frequency of the low-Q R-C-L
circuit. In this case, one can increase the value of
RFMIN to decrease the frequency and increase the
lamp power, or, decrease the value of RFMIN to in-
2)
3)
While measuring LO, apply 15V from pin
VCC to pin COM and adjust the value of
RFMIN to obtain the right minimum fre-
quency (it is suggested set fmin = run fre-
quency obtained with the BDA software).
Increase RFMIN to decrease the minimum
frequency or decrease RFMIN to increase
the minimum frequency.
Apply the AC input and check preheat, igni-
crease the run frequency and decrease the lamp
power.
Pin VCO is connected to ground through a capacitor
(CVCO). The value of this capacitor programs the
time the frequency needs to ramp down from 2.5
times fmin (fmax) to fmin.
One can increase the capacitor value to increase the
preheat time, or, decrease the capacitor value to de-
crease the preheat time.
12
tion and run states of the lamp.
3.1) If the lamp ignites during preheat, the pre
heat current is too small or the starting volt
age across the lamp is too big, increase
the value of CRES to decrease the voltage
across the lamp during preheat and startup
while increasing the preheat current. LRES
may need to be decreased to maintain the
same power and the same frequency.
3.2) If the IC works at a frequency > fmin, in
crease CRES or LRES to decrease the reso
nant frequency avoiding hard-switching, or,
decrease the value of the snubber capaci
tor CSNUBBER (a CSNUBBER minimum
value of 680pF is suggested to make sure
VCC stays above the UVLO-).
www.irf.com
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