AMG-LM302 datasheet, PDF - EEWORLD Datasheet

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AMG-LM302: DescriptionBallast Controller for Metal Halide Lamps; File Size743KB，23 Pages; ManufacturerAlpha-Micro Electronics

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AMG-LM302 Overview

Ballast Controller for Metal Halide Lamps

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AMG-LM302

Ballast Controller for Metal Halide Lamps

1. Functional Description of the AMG-LM302

The AMG-LM302 is a Ballast Controller IC for Metal Halide Lamps (HID, CDM, HQI…).

The AMG-LM302 integrates all functions necessary for control off Metal Halide lamps

including power factor correction (PFC), ignition voltage generation and overdrive, current

supply and power management. The ballast controller specifically supports high stability of

color temperature.

2. Features

PFC



HID

PFC operates in current controlled transition mode (TM) with overvoltage protection

Separate undervoltage lockout for PFC and HID part

Zero current detection for TM operation

Real multiplier for excellent THD

High pulse current driver output for HV Power MOS

Internal reference voltage

Current mode controlled buck converter

Buck converter with Driver for external transistor

Power drive mode for HV MOSFETS

Safe ignition through burst oscillation

30kHz PWM in capture compare mode with maximum duty cycle of 50%

Regulation of lamp power

Slope compensation

Open load and short-circuit detection

Completely adjustable current and power ramp during lamp warm-up period

Full bridge drive for acoustic control

Automatic time control for all function

Monitoring of lamp state

Wide supply range of 14.5V to 35V

Low power startup current

Disable function to shut down the ballast and reduce power consumption

Over temperature protection

Short-circuit protected

Ambient temperature range: -25°C to +125°C



General



Package: TQFP48

3. Application

The AMG-LM302 is suitable for all application where the light spectrum and color temperature

of the sun, which is given by Metal Halide lamps, are needed. The AMG-LM302 controls the

whole lamp ballast and thus not only provides for a low cost solution, but also one, which is

high quality and easy to design.

AMG-LM302

Revision: A

29. Jul. 2010

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AMG-LM302

Ballast Controller for Metal Halide Lamps

Table of Contents

1.Functional Description of the AMG-LM302............................................................................. 1

2.Features................................................................................................................................. 1

3.Application............................................................................................................................. 1

3.1.Example Application Drawing................................................................................................... 2

3.2.Application Notes..................................................................................................................... 2

4.Block Diagram....................................................................................................................... 4

5.Block Descriptions (optional).................................................................................................. 5

6.Pinning / Pad Coordinates..................................................................................................... 6

7.Pin description (optional)....................................................................................................... 8

8.Absolute Maximum Ratings................................................................................................... 8

9.Electrical Characteristics...................................................................................................... 10

9.1.Operational Range................................................................................................................. 10

9.2.DC Characteristics................................................................................................................. 10

9.3.AC Characteristics.................................................................................................................. 14

10.Flow Chart ........................................................................................................................ 16

11.Timing Diagrams................................................................................................................ 17

12.Application......................................................................................................................... 18

12.1.Example Application Circuit(s)............................................................................................. 18

12.2.Calculating PFC Parameters................................................................................................18

12.3.Calculating HID Parameters.................................................................................................19

12.4.Application Notes................................................................................................................. 20

13.IC-Package........................................................................................................................ 20

14.IC-Marking......................................................................................................................... 20

15.Ordering Information.......................................................................................................... 21

16.Notes and Cautions........................................................................................................... 21

16.1.ESD Protection..................................................................................................................... 21

16.2.Storage conditions................................................................................................................ 21

17.Disclaimer.......................................................................................................................... 21

18.Contact Information............................................................................................................ 22

AMG-LM302

Revision: A

29. Jul. 2010

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AMG-LM302

Ballast Controller for Metal Halide Lamps

5. Block Descriptions

The whole application for a metal halide lamp needs the following major function blocks:

•

mains rectification

PFC

lamp power regulation

lamp ignition control

high voltage bridge

bridge drivers

The mains rectification and the high voltage bridge are completely built using discrete

components.

There are two basic options to do the bridge drivers, either discrete or integrated. Alpha

recommends the use of a fully integrated full bridge gate driver AMG-DF102.

The AMG-LM302 does have the PFC, lamp power regulation, ignition control and other

subfunctions integrated.

The PFC part of the AMG-LM302 is a standard power factor correction regulator.

The CDM part contains the power and ignition control of the lamp. For power control the lamp

current I

outi

and the lamp voltage V

outi

get measured and then multiplied to receive the actual

lamp power. The power is then outputed via the CTRLo pin. It can be manipulated and filtered

by external devices and will then get fed (as the actual value) into an error amplifier via the FB

pin. The error amplifier uses an internal 2.5V reference voltage as the set value. The output of

the error amplifier is fed into a current limiter stage and finally outputed via the PWMo pin. The

signal from the PWMo pin eventually drives the buck converter, thus impacting the bridge

voltage and in turn the lamp power.

A capacitor connected to the COP pin sets the frequency of the internal oscillator. The

oscillator frequency eventually determines the switching frequency of the bridge. The oscillator

frequency needs to be double the resonant frequency of the LC low pass filter for the CDM-

lamp. The output BR drives a low and it's corresponding high side transistor. The output nBR

is inverted to BR and drives the other low and high side transistors. A dead time is

automatically inserted before the rising edges of BR and nBR so to avoid shoot through. This

dead time can externally be influenced with a capacitor connected to the CDT pin. The

switching frequency of the oscillator should not be high enough, to avoid audible noise from

the plasma in the lamp. It should not be too high either, cause this will increase power

consumption.

There is a control logic, which senses the state of the lamp. For ignition, it will generate a high

AMG-LM302

Revision: A

29. Jul. 2010

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