参数资料
| 型号： | IRPLMB1E |
| 厂商： | International Rectifier |
| 文件页数： | 5/13页 |
| 文件大小： | 0K |
| 描述： | KIT DESIGN BALLAST 220VAC |
| 标准包装： | 1 |
| 其它名称： | *IRPLMB1E |
IRPLMB1E
6. Functional Description
Figure 6.1 shows the voltage across the lamp and
the current in the resonant inductor LRES during
Startup, Preheat, Ignition and Run Mode.
At startup, VCO is 0V and the frequency is very high
(about 2.5 times fmin). This minimizes voltage spikes
and lamp flash at startup. The frequency ramps down
towards the resonant frequency of the high-Q ballast
output stage, causing the lamp voltage and lamp
current to increase. During this time, the filaments of
the lamp are pre-heated to the emission tempera-
ture to guarantee a long lamp life. The frequency
keeps decreasing until the lamp ignites. If the lamp
ignites successfully, the IR2520D enters RUN Mode.
If the minimum frequency has been chosen below
or very close to the resonant frequency, the IC will
work near resonance and will adjust the frequency
continuously to maintain ZVS at the half-bridge and
to minimize the losses in the FETs. If the minimum
frequency has been chosen higher than the reso-
nant frequency the IR2520D will work at the mini-
mum frequency.
Figure 6.2 shows the current across the resonant
inductor and the voltage across the lamp filaments
at the startup.
Fig. 6.1:
Voltage across the lamp (yellow waveform) and current in
the resonant inductor (green waveform) during Startup,
Preheat, Ignition and Run Mode
When power is turned on, the IR2520D goes into
Under Voltage Lockout (UVLO) mode.
The UVLO mode is designed to maintain a very low
(<200uA) supply current and to guarantee that the IC
is fully functional before the high- and low-side out-
put drivers are activated. During UVLO, the high- and
low-side driver outputs (LO and HO) are both low
and pin VCO is pulled down to COM for resetting the
starting frequency to the maximum.
Once VCC reaches the startup threshold (UVLO+),
the IR2520D turns on and the half-bridge FETs start
to oscillate. The IC goes into Frequency Sweep Mode.
www.irf.com
Figure 6.2:
Voltage across the lamp filaments (yellow) and current
in the resonant inductor (green) at the startup.
5
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| IS-DEV KIT-2 | SMARTSWITCH DEVELOPMENT KIT 2 |
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