IRPLCFL5E

2

www.irf.com

3. Electrical Characteristics

Input Power: 24W @ 220VAC

Input Current: 168mArms @ 220VAC

Starting Frequency: 100KHz

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 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

Input

(VAC)

Pin

(W)

Iinrms

(mA)

Vbusav

(V)

Freq.

(KHz)

PF

THD

(%)

200

21

160

280

40.3

0.63

115

210

22

160

290

40.3

0.625

117

220

24

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