参数资料
| 型号： | IRPLLNR5 |
| 厂商： | International Rectifier |
| 文件页数： | 11/21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 |
8. Functional Description
The IRPLLNR5 reference design consists of an EMI filter, an active power factor correction section, a
ballast control section, and a resonant lamp output stage. The active power factor correction section is a
boost converter operating in critical conduction, free-running frequency mode. The ballast control
section provides frequency modulation control of a traditional RCL lamp resonant output circuit and is
easily adaptable to a wide variety of lamp types. The ballast control section also provides the necessary
circuitry to perform lamp fault detection, shutdown, and auto-restart.
Reference Design Overview
This demo-board is designed for a single 54 W TL5 lamp with voltage mode heating. TL5 lamps are
popular due to their low profile and high lumen/watt output. These lamps, however, can be more
difficult to control due to their higher ignition and running voltages. A typical ballast output stage using
current-mode filament heating (filament placed inside L-C tank) will result in excessive filament current
during running. The output stage has therefore been configured for voltage-mode filament heating using
secondary windings off of the resonant inductor LRES. The lamp has been placed outside the under-
damped resonant circuit loop, which consist of LRES and CRES. The filament heating during preheat
can be adjusted with the capacitors CH1 and CH2. The result is a more flexible ballast output stage
necessary for fulfilling the lamp requirements. The DC blocking capacitor, CDC, is also placed outside
the under-damped resonant circuit loop such that it does not influence the natural resonance frequency
of LRES and CRES. The snubber capacitor, CSNUB, serves as EMI reduction and a charge pump for
supplying the IRS2168D.
The IRS2168D ballast control IC is used to program the ballast operating points and protect the ballast
against conditions such as lamp strike failures, low DC bus or lamp failure during normal operations. It
is also used to regulate the DC bus and for power factor correction to give high power factor and low
harmonic distortion of the ballast AC input current.
Power Factor Correction Section
The power factor correction section contained in the IRS2168D controls a boost topology circuit
operating in critical conduction mode. This topology is designed to step-up and regulate the output DC
bus voltage while drawing sinusoidal current from the line (low THD) which is “in phase” with the AC
input line voltage. The power factor correction section also includes over-current protection of the
boost MOSFET to prevent damage that can occur during boost inductor saturation.
Ballast Control Section
The ballast control section of the IRS2168D ballast control IC contains an oscillator, a high-voltage
half-bridge gate driver, and lamp fault protection circuitry. Please refer to the datasheet of this IC for
the block diagram and the state diagram. The following is a breakdown of the different modes of
operation for the ballast.
Startup Mode
When power is initially applied to the ballast, the voltage on the VCC pin of the IRS2168D begins to
increase. The voltage for the IRS2168D is derived from the current supplied from the rectified AC line
through the startup resistor RSUPPLY. During this initial startup when the VCC voltage of the
IRS2168D is below the rising under-voltage lock-out threshold (UVLO+), the IC is in UVLO Mode and
draws micro-power current at VCC. The micro-power current of the IRS2168D allows for the use of a
www.irf.com
RD-0613
11
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| IS-DEM KIT-2 | SMARTDISPLAY DEMONSTRATION KIT 2 |
| IS-DEV KIT-1 | SMARTSWITCH DEVELOPMENT KIT 1 |
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