IRS2166DPBF International Rectifier, IRS2166DPBF Datasheet - Page 13

• Manufacturer Part Number: IRS2166DPBF
• Description: IC PFC/BALLAST/HALF BRDG 16-DIP
• Manufacturer: International Rectifier
• Type: PFC/Ballast Controllerr

Specifications of IRS2166DPBF

• Frequency: 40 ~ 46 kHz
• Current - Supply: 20mA
• Current - Output: 260mA
• Voltage - Supply: 12.5 V ~ 15.6 V
• Operating Temperature: -25°C ~ 125°C
• Package / Case: 16-DIP (0.300", 7.62mm)
• Package: 16-pin DIP
• Circuit: Fluorescent Ballast IC
• Offset Voltage (v): 600
• Output Source Current Min (ma): 180
• Output Sink Current Min (ma): 260
• Vcc Range (v): 10-20V with UVLO
• Output Voltage Min (v): 10
• Output Voltage Max (v): 20
• Pbf: Yes
• For Use With: IRPLLNR7 - KIT UNIV ELEC BALLAST FLUOR LAMP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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decrease below the internal 4.0 V threshold (V
watch-dog pulse is forced on the PFC pin and normal
PFC operation is resumed.
Undervoltage Reset (UVR)
When the line input voltage is decreased, interrupted or a
brown-out condition occurs, the PFC feedback loop
causes the on-time of M
the DC bus constant. Should the on-time increase too
far, the resulting peak currents in L
saturation current limit of L
very high peak currents and di/dt levels will occur. To
prevent this, the maximum on-time is limited by limiting
the maximum voltage on the COMP pin with an external
zener diode D
decreases, the COMP pin voltage and therefore the on-
time will eventually limit. The PFC can no longer supply
enough current to keep the DC bus fixed for the given
load power and the DC bus will begin to drop.
Decreasing the line input voltage further will cause the
VBUS pin to eventually decrease below the internal 3 V
threshold (V
discharged internally below V
UVLO mode and both the PFC and ballast sections are
disabled (see State Diagram).
resistor to V
current of the IRS2166D, determines the line input turn-
on voltage. This should be set such that the ballast turns
on at a line voltage level above the undervoltage turn-off
level, V
supply resistor to V
pin that correctly program the on and off line input voltage
thresholds for the ballast. With these thresholds correctly
set, the ballast will turn off due to the 3.0 V undervoltage
threshold (V
higher liine input voltage (hysterisis) due to the supply
resistor to V
of the ballast without flickering of the lamp, bouncing of
the DC bus or re-ignition of the lamp when the DC bus is
too low.
Fig. 12: On-time modulation near the zero-crossings
I
PFC
LPFC
pin
CCUV+
0
0
CC
. It is the correct selection of the value of the
BUSUV
BUSUV
CC
near peak region of
. This hysterisis will result in a proper reset
rectified AC line
COMP
, together with the micro-power start-up
) on the VBUS pin, and on again at a
) (Fig. 9).
CC
(Fig. 8).
and the zener diode on the COMP
PFC
PFC
to increase in order to keep
. L
CCUV
When this occurs, V
As the line input voltage
PFC
-, the IRS2166D enters
will then saturate and
The start-up supply
PFC
near zero-crossing region
of rectified AC line
can exceed the
BUSREG
CC
), a
is
Over-Current Protection (OCP)
In case of fast on/off interruptions of the mains input
voltage, or, during normal lamp ignition, the DC bus
voltage level can decrease below the instantaneous
rectified line voltage. Should this occur, the PFC inductor
current and PFC MOSFET current can increase to high
levels causing the PFC inductor to saturate and/or the
PFC MOSFET to become damaged. During fast on/off
interruptions of the mains input voltage, the DC bus can
drop during the time when the mains input voltage is
interrupted (off). Since VCC is still above UVLO-, the IC
will continue to operate and will increase the COMP pin
voltage to increase the PFC MOSFET on-time due to the
dropping of the DC bus. When the mains voltage returns
again quickly (before VCC reaches UVLO-), the on-time
of the PFC MOSFET is too long for the given mains input
voltage level resulting in high PFC inductor and MOSFET
currents that can saturate the inductor and/or damage the
PFC MOSFET (Fig. 13).
During lamp ignition, the DC bus can drop below the
rectified AC line voltage causing current to conduct
directly from the output of the rectifier, through the PFC
inductor and diode, to the DC bus capacitor. This results
in a low-frequency offset of current in the PFC inductor.
Since the zero-crossing detection circuit only detects the
high-frequency zero-crossing of the inductor current, the
PFC MOSFET will turn on again each cycle before the
inductor current has reached zero. This causes the PFC
to work in a continuous conduction mode and the sum of
the low-frequency and high-frequency components of
current can saturate the PFC inductor and/or damage the
PFC MOSFET. To protect against these conditions, a
current sense resistor (ROC) must be inserted between
the source of the PFC MOSFET and ground, and a series
diode (DOC) and limiting resistor (RD) connected from
the top of the current sensing resistor to the VBUS pin
(Fig. 14).
on/off (upper trace: DC Bus, 100V/div; middle trace: AC
line input voltage, 100V/div; lower trace: PFC inductor
Fig. 13: High PFC inductor current during fast mains
current 1A/div).
IRS2166D(S)PbF
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