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IRPLCFL5U: 产品描述CFL Ballast for 26W/Spiral Lamp, 120VAC Input; 文件大小262KB，共15页; 制造商International Rectifier （ Infineon ）; 官网地址http://www.irf.com/

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IRPLCFL5U概述

CFL Ballast for 26W/Spiral Lamp, 120VAC Input

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IRPLCFL5U

International Rectifier

•

233 Kansas Street, El Segundo, CA 90245

USA

CFL Ballast for 26W/Spiral Lamp, 120VAC Input

By Cecilia Contenti

TOPICS COVERED

Overview

Features

Electrical Characteristics

IR2520D Ballast Control IC

Circuit Description

Functional Description

Fault Conditions

RPLCFL5U Layout

Design Procedure to adapt the

design to different lamp types

1. Overview

The IRPLCFL5U reference design is an electronic ballast for driving 26W compact fluorescent

lamps from 120VAC. The circuit provides all of the necessary functions for preheat, ignition and on-

state operation of the lamp and also includes the EMI filter and the rectification stage. The circuit is

built around the IR2520D Ballast Control IC. The IR2520D provides adjustable preheat time, adjust-

able run frequency to set the lamp power, high starting frequency for soft start and to avoid lamp

flash, fault protection for open filament condition and failure to strike, low AC line protection and

auto-restart after line brownout conditions. The IR2520D is a low-cost solution specific for CFL

applications. The IR2520D has only 8 pins and allows the component count for the complete ballast

to be reduced down to 20 components.

2. Features

Programmable run frequency

Programmable preheat time

Open filaments and no-lamp protection

Failure to Strike and deactivated-lamp protection

Low AC line protection

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IRPLCFL5U

3. Electrical Characteristics

Input Power: 26W @ 120VAC

Input Current: 375mArms @ 120VAC

Starting Frequency: 100KHz

Average Run Frequency: 40KHz

Ballast turn-on voltage: 70VAC

Ballast turnoff voltage: 45VAC

Input

(VAC)

100

110

120

130

(W)

21.4

24.5

26.5

Iinrms

(mA)

360

375

380

375

370

Vbusav

(V)

240

260

280

300

320

Freq.

(KHz)

40.3

0.56

0.6

0.55

THD

(%)

114

116

120

127

4. IR2520D Ballast Control IC

The IR2520D is intended for driving CFL and TL lamps in CFL or small size ballasts applications.

The IR2520D integrates all of the necessary functions for preheat, ignition and on-state operation of

the lamp, plus, lamp fault protection and low AC-line protection, together with a complete high- and

low-side 600V half-bridge driver, the IR2520D has only 8 pins and fits into a standard SO8 or DIP8

package. The IR2520D has been designed to overcome the disadvantage of discrete self-oscillat-

ing solutions while maintaining low cost.

In the CFL market, the self-oscillating bipolar transistor solution remains very popular. This ap-

proach is very simple in nature but has many disadvantages including: DIAC or additional circuit

required for starting, additional free-wheeling diodes required, operating frequencies determined

by bipolar transistor storage time and toroid saturation (not easy to design, very dependent on

tolerances in production and difficult to set the frequencies precisely), unreliable “always hot” PTC

thermistor used for preheat that often fails in the field, no protection against lamp non-strike or open

filaments conditions, no smooth frequency ramping during ignition, capacitive mode operations,

high crest factor in the lamp current. These drawbacks can result in high susceptibility to components

and load tolerances, short lamp life and/or catastrophic failure of ballast output stage components.

The heart of the IR2520D is a voltage controlled oscillator (VCO) with externally programmable mini-

mum frequency and 0-5VDC analog voltage input. The IC includes adaptive zero-voltage switching

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IRPLCFL5U

(ZVS) and non-ZVS protection, as well as integrated bootstrap diode. The IC protects against non-

ZVS by automatically setting the frequency to ensure ZVS. The IC will eventually shut-down if the

non-ZVS condition cannot be achieved.

One of the biggest advantages of the IR2520D is that it incorporates an internal current crest factor

driven shutdown function and it eliminates the need for a high-precision current sensing resistor

that is typically used to detect over current. The IC uses the VS pin and the RDSon of the low-side

half-bridge MOSFET for over-current protection and to detect non-ZVS conditions. An internal 600V

FET connects the VS pin to the VS sensing circuitry and allows for the VS pin to be accurately

measured during the time when pin LO is high, while withstanding the high DC bus voltage during

the other portion of the switching cycle when the high-side FET is turned on and VS is at the DC bus

potential. Please refer to the IR2520D data sheet for further information on the IR2520D including

electrical parameters, state diagram and complete functional description. As a result of the IR2520D

features, the IRPLCFL5U circuit using the IR2520D is a complete CFL solution that offers better

reliability and longer lamp life than self oscillating solutions while reducing component count and

ballast size.

5. Circuit Description

The schematic for IRPLCFL5U is shown in figure 5.1. The BOM with the components values is

shown in table 5.2.

The ballast incorporates a fuse, EMI filter, input rectifier, bus capacitor, half-bridge, control and

output stage. The output stage is the classical resonant circuit consisting of an inductor, LRES, and

a capacitor, CRES. The circuit is built around the IR2520D Ballast Control IC. The IR2520D pro-

vides adjustable preheat time, adjustable run frequency to set the lamp power, high starting fre-

quency (about 2.5 times fmin) to avoid lamp flash, capacitive mode protection for open filament

condition and current crest factor protection for failure to strike or no lamp conditions.

The AC line input voltage is rectified to provide a bus voltage of approximately 300 volts. The start

up resistors, Rsupply1 and Rsupply2, are sized such that they can supply the micro-power current

during under-voltage lockout (UVLO). When VCC exceeds the UVLO+ threshold, the IR2520D

begins to oscillate and the charge pump circuit (CSNUB, DCP1 and DCP2) supplies the current to

VCC that causes the internal 15.6V zener clamp to regulate.

The IR2520D Ballast Control IC controls the frequency of the half-bridge as well as the ballast

states and protection modes such as lamp preheat, lamp ignition, running mode, low AC line

protection and lamp/ballast fault protection.

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IRPLCFL5U

IRPLCFL5U概述

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