参数资料
| 型号： | IRPLLNR5 |
| 厂商： | International Rectifier |
| 文件页数： | 12/21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 |
large value, low-wattage startup resistor (RSUPPLY). When the voltage on the IRS2168D reaches the
rising under-voltage lockout threshold (12.5 V), the gate driver oscillator is enabled (this assumes that
there are no fault conditions) and drives the half-bridge output MOSFETs (MHS and MLS). When the
half-bridge is oscillating, capacitor CSNUB, diodes DCP1 and DCP2 form a snubber/charge pump
circuit which limits the rise and fall time at the half-bridge output and also supplies the current to charge
capacitor CVCC2 to the VCC clamp voltage (approx. 15.6 V). When the rising under-voltage lockout
threshold of the IRS2168D is reached, the power factor control output also starts to oscillate and drives
MOSFET MPFC to boost and regulate the bus voltage to 500 V DC.
Preheat Mode
When the ballast reaches the end of the UVLO mode, the Preheat Mode is entered. At this point, the
ballast control oscillator of the IRS2168D has begun to operate and the half-bridge output is driving
the resonant load (lamp) circuit.
There is an initial startup frequency that is higher than the preheat 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 undesired flash of the lamp can occur.
This in effect is a cold strike of the lamp and can shorten the life of the lamp.
The ballast control section oscillator of the IRS2168D consists of an internal timing capacitor and an
external timing resistor (RFMIN). Resistors RFMIN and RPH program a current that determines the
ramp up time of the internal timing capacitor. The preheat frequency is determined by the equivalent
resistance formed by the parallel combination of RFMIN and RPH. The preheat frequency is selected
such that the voltage appearing across the lamp is below the minimum lamp ignition voltage while
supplying enough current to preheat the lamp filaments to their correct emission temperature within the
Preheat Mode time period. The preheating of the lamp filaments is performed using voltage mode
heating that consists of a constant voltage across the lamp filaments. The waveform in Figure 7 shows
the CPH voltage and lamp voltage during normal Preheat, Ignition, and Run Modes. Figure 8 shows the
half-bridge voltage (VS pin) during Preheat Mode.
www.irf.com
RD-0613
12
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| IS-DEM KIT-2 | SMARTDISPLAY DEMONSTRATION KIT 2 |
| IS-DEV KIT-1 | SMARTSWITCH DEVELOPMENT KIT 1 |
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| IRPLLNR7 | 功能描述:电源管理IC开发工具 Flourescent Ballast Using IRS2166DPBF RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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