参数资料
| 型号： | IRPLLNR5 |
| 厂商： | International Rectifier |
| 文件页数： | 18/21页 |
| 文件大小： | 0K |
| 描述： | KIT BALLAST UNIV FLUOR 54W TL5 |
| 标准包装： | 1 |
| 主要目的： | 照明，镇流器控制 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | IRS2168D |
| 主要属性： | 54 W TL5，90 ~ 305 VAC，PFC |
| 次要属性： | 灯丝预热，自动复位；灯丝断路、无灯和电压不足保护 |
| 已供物品： | 板，CD |
| 相关产品： | IRS2168DPBF-ND - IC PFC BALLAST CTLR ADV 16-PDIP IRS2168DSPBF-ND - IC PFC/BALLAST CONTROL 16-SOIC IRS2168DSTRPBFDKR-ND - IC PFC & BALLAST CONTROL 16-SOIC IRS2168DSTRPBFCT-ND - IC PFC & BALLAST CONTROL 16-SOIC IRS2168DSTRPBFTR-ND - IC PFC & BALLAST CONTROL 16-SOIC |
If at any time during Preheat Mode or Run Mode the voltage across resistor RCS rises above the over-
current threshold (1.25 V) for 65 events, the PFC and half-bridge MOSFETs, (MPFC, MHS and MLS)
are turned off and the ballast goes into Fault Mode. During the Ignition Mode, the over-current is
disabled and the ignition regulation feature limits the maximum current flowing in the resonant tank
and half-bridge. An over-current condition can occur if the lamp fails to ignite or the lamp is broken
(an open circuit cathode or broken lamp). If a cathode is broken (open circuit), the half-bridge output
hard-switches. Each time the low-side MOSFET (MLS) is turned on, a large current pulse occurs and
thus a large voltage pulse occurs across resistor RCS signaling a fault. The ballast will remain in Fault
Mode until the AC line voltage is reset or a lamp replacement is performed.
During an end-of-life lamp fault condition, the lamp voltage can increase or decrease asymmetrically.
The resulting excessive voltage across the lamp filaments can cause the lamp ends to reach temperatures
high enough to melt the tube glass. The lamp can then fall out of the fixture and cause harm or damage.
To protect against this condition, resistors REOL1, REOL2, REOL3, REOL4, and zener diodes DEOL1
and DEOL2, are used for end-of-life protection. The end-of-life window comparator at the SD/EOL pin
is enabled in Run Mode. If the voltage on SD/EOL pin falls outside the range of the internal 1 V – 3 V
window comparator, the IC will enter Fault Mode. The SD/EOL pin is internally biased at 2 V with an
internal +/-10 μ A OTA. The value of REOL4, DEOL1 and DEOL2 are selected such that the SD/EOL
pin remains at 2 V during normal operation, but increases above 3 V or decreases below 1 V during an
end-of-life fault condition. The lamp voltage end-of-life threshold can be adjusted by changing the value
of resistor REOL4 and/or zener diodes DEOL1 and DEOL2. A threshold of 30% higher than the
nominal running lamp voltage is typical.
PFC Control Section
The IRS2168D contains control circuitry for driving a boost-type power factor correction (PFC) circuit.
This is necessary for producing sinusoidal input current at the mains input that is “in phase” with the
mains voltage and contains minimal total harmonic distortion (THD). It is also convenient to use the
boost converter to regulate the DC bus voltage to a constant DC level. The PFC control is achieved
using five control pins. The DC bus voltage is sensed with a resistor divider at the VBUS pin. The loop
compensation speed is programmed with an external capacitor at the COMP pin. The cycle-by-cycle
zero-crossing of the boost inductor current is detected at the ZX pin. The gate drive for the boost
MOSFET is provided by the PFC pin. The cycle-by-cycle over-current protection is performed by the
OC pin. The following waveforms show the operation of the PFC at 120 VAC (Figure 13) and 290 V
AC (Figure 14) input line conditions.
www.irf.com
RD-0613
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