IRS2168DSPBF International Rectifier, IRS2168DSPBF Datasheet - Page 12

• Manufacturer Part Number: IRS2168DSPBF
• Description: IC PFC/BALLAST CONTROL 16-SOIC
• Manufacturer: International Rectifier
• Type: PFC/Ballast Controllerr

Specifications of IRS2168DSPBF

• Frequency: 42.5 ~ 46.5 kHz
• Current - Supply: 10mA
• Current - Output: 260mA
• Voltage - Supply: 12.5 V ~ 15.6 V
• Operating Temperature: -25°C ~ 125°C
• Package / Case: 16-SOIC (3.9mm Width)
• Package: 16-lead SOIC
• Circuit: PFC Ballast Control and Half-Bridge Driver
• Offset Voltage (v): 600
• Output Source Current Min (ma): 180
• Output Sink Current Min (ma): 260
• Pbf: Yes
• For Use With: IRPLLNR5 - KIT BALLAST UNIV FLUOR 54W TL5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Preheat Mode (PH)
The IRS2168D enters preheat mode when V
the UVLO positive-going threshold (V
MOSFET that connects pin CPH to COM is turned off and
an external resistor (Fig. 3) begins to charge the external
preheat timing capacitor (C
oscillate at a higher soft-start frequency and ramp down
quickly to the preheat frequency. The VCO pin is
connected to COM through an internal
MOSFET M1 so the preheat frequency is determined by
the equivalent resistance at the FMIN pin formed by the
parallel combination of resistors R
frequency remains at the preheat frequency until the
voltage on pin C
(V
preheat mode, the over-current protection on pin CS and
the 65-cycle (n
counter are both enabled. The PFC circuit is working in
high-gain mode (see PFC section) and keeps the DC bus
voltage regulated at a constant level.
Ignition Mode (IGN)
The IRS2168D ignition mode is defined by the second
time C
(V
2/3*V
quickly through an internal MOSFET down to 1/3*V
(V
turns off and the voltage on pin C
again. The internal MOSFET M1 at pin V
CPHEOP+
CPHRUN+
CPHSO
V
V
CC
BUS
BUS
I
PH
(+)
-
(-)
(V
) (see Figs. 4 and 5).
) and the IC enters Ignition Mode. During
).
CPHRUN+
C
C
R
R
charges from 1/3*V
R
CPH
PH
VCO
FMIN
PH
VCC
When the voltage on pin CPH exceeds
FMIN
CPH
VCO
Figure 3: Preheat circuitry
EVENTS
) for the first time, pin CPH is discharged
3
4
5
IRS2168D
M1
PH
MODE
) consecutive over-current fault
exceeds approvixmately 2/3*V
OSC.
PH
12
).
COM
CC
Bridge
Driver
Half-
The internal MOSFET
LO and HO begin to
PH
(V
FMIN
CCUV+
CPHSOI-
16
15
11
10
begins to increase
HO
VS
LO
CS
CO
C
R
CS
). The internal
and R
3
turn
) to 2/3*V
CC
R
MHS
MLS
Output
Bridge
CS
Half-
Load
Return
I
LOAD
exceeds
PH
. The
CC
CC
CC
off and resistor R
equivalent resistance at the FMIN pin increases from the
parallel combination (R
programmed by the external capacitor at pin VCO (C
and resistor R
ramp down smoothly from the preheat frequency through
the ignition frequency to the final run frequency. During
this ignition ramp, the frequency sweeps through the
resonance frequency of the lamp output stage to ignite
the lamp.
The over-current threshold on pin CS will protect the
ballast against a non-strike or open-filament lamp fault
condition. The voltage on pin CS is defined by the lower
half-bridge MOSFET current flowing through the external
current sensing resistor R
maximum peak ignition current (and therefore peak
V
V
V
V
CPH
BUS
BUS
VCO
1/3*V
(+)
2/3*V
(-)
Figure 4: C
2V
CC
R
C
C
CC
R
R
CPH
PH
VCO
FMIN
PH
VCC
t
PH
FMIN
PH
CPH
VCO
= R
PREHEAT
Figure 5: Ignition circuitry
. This causes the operating frequency to
CPH
3
4
5
IRS2168D
* C
PH
REG.
IGN.
PH
PH
MODE
is disconnected from COM.
M1
and VCO timing diagram
PH
OSC.
CS
//R
. This resistor programs the
12
FMIN
COM
t
RAMP
Bridge
Driver
IGNITION
Half-
+
) to R
-
IRS2168D(S)PbF
= R
1.25V
PH
* C
16
15
11
10
HO
VS
LO
CS
VCO
FMIN
C
R
CS
3
RUN
at a rate
R
MHS
MLS
Bridge
Output
CS
Half-
Load
Return
I
LOAD
t
t
The
VCO
)
Page 12