参数资料
型号: IRPLLNR3
厂商: International Rectifier
英文描述: Universal Input Linear Fluorescent Ballast using the IR2167
中文描述: 通用输入线性荧光灯镇流器用IR2167
文件页数: 10/27页
文件大小: 341K
代理商: IRPLLNR3
10
www.irf.com
IRPLLNR3
Figure 4 shows a plot of the half-bridge oscillation frequency as a function of time for all of the normal
modes of operation: Preheat mode, Ignition Ramp mode and Run mode. As shown in Figure 4 there
is an initial startup frequency that is much higher than the steady state Preheat mode frequency that
lasts for only a short duration. This is done to ensure that the initial voltage appearing across the lamp
at the startup of oscillation does not exceed the minimum lamp ignition voltage. If, at the initiation of
oscillation of the half-bridge, the voltage across the lamp is large enough, a visible flash of the lamp
occurs which should be avoided. This in effect is a cold strike of the lamp, which could shorten the
life of the lamp. Figure 5 shows the lamp voltage without the high initial startup frequency while Figure
6 shows the lamp voltage with the high initial frequency startup.
f
osc
t
preheat
ignition
run
f
Preheat
f
Run
f
Ignition
Figure 4:
Oscillator frequency versus time, Normal operating conditions
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