Datasheet > ABR-42022

ABR-42022

更新时间： 2024-09-14 22:05:15

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		/
页数	文件大小	规格书
4页	70K
描述
ML4833 220V Non-Dimming Ballast Design

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ABR-42022 数据手册

August1997

Application Brief 42022

ML4833 220V Non-Dimming Ballast Design

GENERAL DESCRIPTION

CONVERSION

This Application Brief exists as a supplement to

Application Note 63. When used with Application Note

63, this document contains all the necessary information

to convert an ML4833 Evaluation Board into a low-cost,

non-dimming 220V ballast.

To convert the ML4833 Evaluation Board to the non-

dimming design described:

Remove the dimmer control interface

subassembly.

This power factor corrected, 60W non-dimming ballast

Remove components R2,R3, R16, C4, C5 and T5

(as shown in Figure 2). Ground LAMP FB.

operates over a 187 to 253V

line, and is designed to

RMS

power two series connected F32T8 lamps. The design

preserves the features of the dimming ballast, which

include:

Replace R24 and C22 with jumpers and change

the values of R21 and R5 per Table 1.

•

0.99 minimum power factor

Less than 10% THD

The new components (R26, R27, C27 and D14)

can be assembled using available wiring at T5.

Shaded items in Table 1 indicate changes to the original

ML4833 Evaluation Board parts list.

Programmable starting sequence for low glow

current and extended lamp life

VENDOR LIST

•

Greater than 92% efficiency

All American

Capsco

(800) 222-6001

On-chip thermal and lamp out detection circuitry

(800) 538-8587

Power down threshold for GFI or end of lamp life

protection

Future Active Inc.

Digi-Key Corp.

(800) 723-5817, (408) 434-9599

(800) 344-4539

The mode of operation used for preheating and striking of

the lamps is the widely accepted variable frequency, non-

overlapping inverter topology.

Premier Magnetics (714) 362-4211

R&D Electronic Parts (800) 675-1177

Specific details on power factor correction and resonant

lamp network design can be obtained from Application

Note 63.

PCB Engineering

(408) 946-2075

EMI

Inverter

PFC

Lamp

Network

Bridge

Filter

Rectifier

198 - 242

VAC

ML4833

Interrupt

Figure 1. Functional Block Diagram

REV. 1.0 10/25/2000

12 3 4

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