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Part: IRPLCFL2
Category:
Discrete
Description: 42W, Single, Compact Fluorescent Lighting Ballast, IR2156 100/220VAC
Company: International Rectifier Corp.
Datasheet: Download IRPLCFL2 datasheet File size : 52 kB
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Datasheet text preview:
International Rectifier · 233 Kansas Street, El Segundo, CA 90245 USA
IRPLCFL2a
IRPLCFL2 42 Watt Compact Fluorescent Ballast Reference Design
Overview
The CFL-2 is an electronic ballast design for driving a 42 watt compact fluorescent lamp from a 120 or 230 volt AC line. The circuit was designed using the IR2156 Ballast Driver IC. The main features of the circuit are programmable frequency, preheat time, over-current threshold and dead time. A circuit board was designed and tested to verify reliable functionality under actual operating conditions. LAMP TYPE: GE BIAX Q/E 42W (F42QBX)
Features
* * * * * Programmable preheat frequency Programmable preheat time Programmable over-current threshold Programmable run frequency Programmable dead time
Electrical Characteristics
Parameter Input Power Input Current (120V) Preheat Frequency Run Frequency Value 42W 530mA 75kHz 45kHz
Circuit Description
The schematic for CFL-2 is shown in Figure 1. With a 120 volt AC line input (AC1-N), the voltage is rectified and doubled to provide a bus voltage of approximately 300 volts. With a 220 volt AC line input (AC1-AC2), the voltage is rectified but not doubled and again provides a bus voltage of approximately 300 volts. The start up resistor, RSUPPLY, is sized such that it can supply the micro-power current during under-voltage lockout (UVLO). When VCC exceeds the UVLO+ threshold, the IR2156 begins to oscillate and the charge pump circuit (CCP, DCP1, and DCP2) supplies the current to VCC which causes the internal 15.6V shunt clamp to regulate.
www.irf.com 1
IRPLCFL2
AC1 R VDC D BOOT R SUPPLY F1
NC
1
VCC
14 13
VB
D CP2 M1
C ELCAP1
2 3
RT
HO
IR2156
C 8 + CVCC1
VDC
L RES
12 11
VS LO
N C BOOT M2 C CP R1 C CS
C RES
4
RPH
RT R PH
CT
CS
5 6
CPH
10
SD
C ELCAP1 D CP1
9
COM
7 CT C VDC CCPH
8
R CS
AC2
BR1
Figure. 1, IRPLCFL2 Schematic Diagram
2
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IRPLCFL2
At initial startup, the output frequency is determined by timing capacitor CT and the parallel combination of RT, RPH and an internal resistor, RSOFTSTART. CT is selected depending on the desired deadtime and is given as:
t DT = CT 1475 [Seconds]
(1)
After a few hundred micro-seconds, RSOFTSTART is slowly switched away (See Figure 4). This provides a soft-start of the resonant output stage which eliminates large voltage transients which can cause a small start-up flash across the lamp. Once RSOFTSTART is disconnected, the parallel combination of RT and RPH determine the output frequency during preheat and is given as:
f PH =
1 0.51 RT RPH 2 CT + 1475 R +R T PH
(2)
The IC remains in preheat mode until the voltage on CPH exceeds VCC-2V. The preheat time is determined by an internal current source charging external capacitor CPH and is given as:
t PH = C PH 2.6e6
(3)
When CPH exceeds VCC-2V, RPH is slowly disconnected from RT, which causes the frequency to ramp smoothly from the preheat frequency, through the ignition frequency to the final run frequency. The voltage across the lamp at ignition should be sufficient to ignite the lamp under all operating conditions. The ignition current should never saturate the inductor, and is given as:
I IGN =
1.3 RCS [Amps Peak]
(4)
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3
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