参数资料
型号: IRPLHID2
厂商: International Rectifier
文件页数: 16/30页
文件大小: 0K
描述: KIT DESIGN BALLAST IRS2573D
标准包装: 1
系列: *
主要目的: 照明,镇流器控制
嵌入式:
已用 IC / 零件: *
主要属性: *
次要属性: *
已供物品:
6.2 Under-Voltage Fault Counter
The IC also includes an under-voltage fault counter at the VSENSE pin. Once the lamp
has ignited, the lamp voltage will decrease sharply to a very low voltage (20V typical).
As the lamp warms up, the lamp voltage will slowly increase until the nominal running
voltage is reached (100V typical). If the lamp voltage remains too low for too long, then
this is a lamp fault condition and the ballast must shutdown. To detect this, the VSENSE
pin includes an under-voltage threshold of VOV(1/7.5). If the voltage at the VSENSE pin
remains below VOV(1/7.5) and the under-voltage fault counter times out (295sec typical,
with CTCLK=0.18uF), then the lamp is not warming up properly due to a lamp fault
condition (end of life, etc.) and the IC will enter fault mode and shutdown. If the voltage
at the VSENSE pin increases above VOV(1/7.5) before the under-voltage counter times
out, then the lamp has successfully warmed up and the IC will remain in general mode.
Figure 6.2 shows some waveforms when the ballast goes into Fault Mode due to under-
voltage fault.
Figure 6.2: Under-voltage fault: CH1 is TCLK pin voltage, CH2 is VSENSE voltage, CH3 is LO voltage
and CH4 is VCC voltage
6.3 Fast Transient Under-Voltage Fault Counter
During normal running conditions, fast transient under-voltage spikes can occur on the
lamp voltage due to instabilities in the lamp arc. The resulting transients on the
VSENSE pin will cycle below and above the VOV(1/7.5) threshold quickly (<50us). If the
number of events of these transients exceeds the maximum number of events of the
fault counter (16,384 events typical), then the IC will enter fault mode and shutdown.
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