IRPLMB1E datasheet(2/13 Pages) IRF

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IRPLMB1E

Input

(VAC)

(W)

Iinrms

(mA)

Vbusav

(V)

Freq.

(KHz)

THD

(%)

200

160

280

40.3

0.63

115

210

160

290

40.3

0.625

117

220

168

300

40.3

0.62

118

230

24.2

168

310

40.3

0.62

118

240

24.5

168

320

40.3

0.61

118

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

3. Electrical Characteristics

Input Power: 24W @ 220VAC

Input Current: 168mArms @ 220VAC

Starting Frequency: 100KHz

Average Run Frequency: 40KHz

Ballast turn-on voltage: 120VAC

Ballast turn-off voltage: 70VAC

4. IR2520D Ballast Control IC

The IR2520D is intended for driving CFL and TL

lamps in CFL or matchbox (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 SOIC8 or

DIP8 package. The IR2520D has been designed to

overcome the disadvantage of discrete self-

oscillating solutions while maintaining low cost.

In the CFL market, the self-oscillating bipolar

transistor solution is still more popular than a

ballast control IC plus FETs solution due to lower

cost. This approach is very simple in nature but has

disadvantages including:

DIAC or additional circuit required for starting,

additional free-wheeling diodes required

operating frequencies determined by bi-polar tran-

sistor 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 can result in high susceptibility to components

and load tolerances and/or catastrophic failure of

ballast output stage components and a short lamp

life. The IR2520D includes adaptive zero-voltage

switching (ZV, adaptive run frequency for zero-volt-

age switching), internal crest factor and non-zero

voltage switching (ZVS) protection, as well as an in-

tegrated bootstrap diode. The heart of this IC is a

voltage controlled oscillator (VCO) with externally

programmable minimum frequency and a 0-5VDC

analog voltage input. One of the biggest advantages

of the IR2520 is that it 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 sens-

ing circuitry and allows for the VS pin to be accu-

rately 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. This eliminates the need for a high-

precision current sensing resistor that is typically

used to detect over current. Please refer to the

IR2520D datasheet for further information on the

IR2520D including electrical parameters, state

diagram and complete functional description.

As a result of the IR2520 features, the MINIBALLAST1

circuit using the IR2520D is a complete matchbox

solution that offers better reliability and longer lamp

life than self oscillating solutions while reducing

component count and ballast size.

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