IRPLCFL3 (International) PDF资料下载 Datasheet(5/12 页)

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参数资料

型号：	IRPLCFL3
厂商：	International Rectifier
文件页数：	5/12页
文件大小：	0K
描述：	KIT DESIGN CFL TRIAC DIMMING
标准包装：	1
主要目的：	照明，镇流器控制
已用 IC / 零件：	IR2156
已供物品：	板，文档
相关产品：	IR2156SPBFDKR-ND - IC CONTROLLR BALLAST 600V 14SOIC IR2156SPBF-ND - IC CTRLR BALLAST 600V .5A 14SOIC IR2156SPBFCT-ND - IC CONTROLLR BALLAST 600V 14SOIC IR2156SPBFTR-ND - IC CONTROLLR BALLAST 600V 14SOIC IR2156PBF-ND - IC CONTROLLER BALLAST 600V 14DIP IR2156STR-ND - IC BALLAST CONT 600V .5A 14-SOIC IR2156-ND - IC CNTL BALLAST 600V 0.5A 14-DIP IR2156S-ND - IC CNTL BALLAST 600V 0.5A 14SOIC
其它名称：	*IRPLCFL3

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IRPLCFL3

The voltage waveform at the junction of D2 and D3, ignoring high frequency

components is equivalent to the output voltage of the dimmer. With respect to the

negative rail of the bus this will be a phase cut approximate sine wave with a DC offset

such that the negative peak is at 0V. This is reduced by the voltage divider network of

R8 and R13 which is then fed into D6 and D15. Only the signal representing the positive

half-cycle of the mains is left at the anode of D5 which is then converted to a DC level

via the filter network of R7, R10 and C10. Because the minimum dimming level occurs

at a point where the dimmer is still capable of providing enough output for the ballast to

operate, this voltage will never actually be zero. Also when the dimmer is at maximum

this voltage will only be approximately 3 times the level at minimum dimming level.

Since we require a reference voltage to control the lamp current in a closed loop system

it is clear that this would only allow dimming down to one third of the lamp current which

is not sufficient range. For this reason an offset stage has been added. The inverting

input of op amp IC1a is connected to a reference voltage determined by R4 and R5

divided down from the IC supply voltage which is clamped at around 15.6V by the

IR2156. The gain is positive and set by the ratio of R11 and R6.

If the voltage at the non-inverting input is Vin and the voltage at the junction of R4 and

R5 is Vref, then Vout will be;

(1 + R11/R6).Vin – (R11/R6).Vref

In this circuit R6 = R11 therefore;

Vout = 2.Vin – Vref

The values of R4 and R5 have been selected so that when the dimmer is set to

minimum the output of IC1a will be zero and as the dimmer output is increased the

output of IC1a will increase to approximately 0.5V. The current sense resistor R14 is

selected to give 0.5V when the lamp current is at maximum.

The error amplifier is implemented in IC1b. The lamp current feedback is fed into the

non-inverting input and the control voltage is fed into the inverting input. The input

resistors R12 and R14 have been chosen with an integrating capacitor of 10nF to give

the best response and elimination of flicker but to avoid generating RF interference. The

output of IC1b works as a current source. The more positive the output swings the more

current is supplied to the CT pin of the IR2156 which is added to the current provided by

RT causing CT to charge more quickly and the frequency to increase. If IC1b output is

zero the frequency is at its minimum determined by the value of RT only. During preheat

the frequency is set by RPH only and IC1b has no effect.

R9 ensures that even when the dimming reference voltage from the output of IC1a is

zero, the error amplifier has a small voltage at the inverting input which means that it is

impossible to dim the lamp below a particular point. This point is selected as the

minimum lamp level at which the lamp will remain lit and will not flicker. The resistor

R22 can be added if necessary to remove striations (dark rings) in the lamp that may

occur at low dimming levels.

5

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相关代理商/技术参数	参数描述
IRPLCFL4	功能描述:IC BALLAST DIMMING CFL 3-WAY RoHS:否类别:编程器，开发系统 >> 评估演示板和套件系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器嵌入式:否已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池次要属性:状态 LED 已供物品:板
IRPLCFL5E	功能描述:KIT DESIGN CFL BALLAST 220VAC RoHS:否类别:编程器，开发系统 >> 过时/停产零件编号系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口）所含物品:面板、缆线、软件、数据表和用户手册其它名称:520-1035
IRPLCFL5U	功能描述:KIT DESIGN CFL BALLAST 120VAC RoHS:否类别:编程器，开发系统 >> 过时/停产零件编号系列:- 标准包装:1 系列:- 类型:MCU 适用于相关产品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口）所含物品:面板、缆线、软件、数据表和用户手册其它名称:520-1035
IRPLCFL7U	制造商:International Rectifier 功能描述:9999V 999.000A OTHER - Boxed Product (Development Kits)
IRPLCFL8U	功能描述:电源管理IC开发工具 3 lvl Dim CFL Fluor Ballast w/IRS2530D 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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