IRS2168DSPBF International Rectifier, IRS2168DSPBF Datasheet - Page 11

• 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

www.irf.com
I. Ballast Section
Functional Description
Undervoltage Lockout Mode (UVLO)
The undervoltage lockout mode (UVLO) is defined as the
state the IC is in when V
of the IC. To identify the different modes of the IC, refer to
the State Diagram shown on page 3 of this document. The
IRS2168D undervoltage lockout is designed to maintain
an ultra low supply current of 250 µA (I
guarantee the IC is fully functional before the high- and
low-side output drivers are activated. Figure 1 shows an
efficient supply voltage using the micro-power start-up
current of the IRS2168D together with a snubber charge
pump from the half-bridge output (R
C
The V
current through supply resistor (R
current drawn by the IC. This resistor is chosen to set the
desired AC line input voltage turn-on threshold for the
ballast. When the voltage at V
threshold (V
the IC turns on and LO begins to oscillate. The capacitors
at V
operating current (Fig. 2). The high-side supply voltage,
V
through the internal bootstrap MOSFET during the LO on-
time of each LO switching cycle. When the V
exceeds the high-side start-up threshold (V
begins to oscillate. This may take several cycles of LO to
charge V
bootstrap MOSFET.
B-
SNUB
V
S
CC
, begins to increase as capacitor C
, D
CC
V
RECT
V
V
BUS
CP1
BUS
begin to discharge due to the increase in IC
(+)
(+)
capacitors (C
(-)
B
Figure 1: Start-up and supply circuitry
-V
and D
CCUV+
S
IC
COM
above V
) and the SD pin is below 3.0 V (V
CP2
IRS2168D
CONTROL
).
BSFET
VCC1
BSUV+
BSFET
CC
and C
is below the turn-on threshold
16
15
14
13
12
11
10
due to R
HO
CS
VS
VB
VCC
COM
LO
C
CC
CS
R
R
C
R
R
C
3
VCC2
HO
LO
BS
R
VCC
VCC1
exceeds the IC start-up
2
VCC
C
) are charged by the
VCC2
) minus the start-up
DSon
VCC
MHS
MLS
R
R
CS
1
, C
BSUV+
D
QCCUV
of the internal
CP2
BS
B-
VCC1
is charged
C
D
V
), HO then
), and to
SNUB
CP1
S
To Load
Return
Load
, C
voltage
SDTH
VCC2
-),
,
When LO and HO are both oscillating, the external
MOSFETs (MHS and MLS) are turned on and off with a
50% duty cycle and a non-overlapping deadtime of 1.6
µs (t
between the DC bus voltage and COM. During the
deadtime between the turn-off of LO and the turn-on of
HO, the half-bridge output voltage transitions from COM
to the DC bus voltage at a dV/dt rate determined by the
snubber capacitor (C
charges, current will flow through the charge pump diode
(D
bridge output, the charge pump and the internal 15.6 V
Zener clamp of the IC take over as the supply voltage.
Capacitor C
discharge time and should be large enough such that
V
pump takes over. Capacitor C
filtering and must be placed as close as possible and
directly between V
than 0.1 µF Resistors R
limiting high currents that can flow to V
pump during hard-switching of the half-bridge or during
lamp ignition.
supply capacitor (C
the high side driver circuitry. During UVLO mode, the
high- and low-side driver outputs HO and LO are both
low, the internal oscillator is disabled, and pin CPH is
connected internally to COM for resetting the preheat
time.
CC
CP2
does not decrease below UVLO- before the charge
d
) to V
V
). The half-bridge output (pin V
C1
CC
VCC2
R
TIME
CONSTANT
. After several switching cycles of the half-
V
VCC
V
Figure 2: V
UVLO+
UVLO-
& C
VHYST
supplies the IC current during the V
The internal bootstrap MOSFET and
VCC1,2
CC
BS
and COM, and should not be lower
DISCHARGE
) comprise the supply voltage for
SNUB
C
VCC
1
CC
).
and R
supply voltage
As the snubber capacitor
VCC1
2
CHARGE PUMP
OUTPUT
IRS2168D(S)PbF
are recommended for
DISCHARGE
TIME
is required for noise
S
INTERNAL VCC
ZENER CLAMP VOLTAGE
CC
) begins to switch
from the charge
t
CC
Page 11