IRS2166DSPBF International Rectifier, IRS2166DSPBF Datasheet - Page 9

• Manufacturer Part Number: IRS2166DSPBF
• Description: IC PFC/BALLAST/HALF BRDG 16-SOIC
• Manufacturer: International Rectifier
• Type: PFC/Ballast Controllerr

Specifications of IRS2166DSPBF

• 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-SOIC (3.9mm Width)
• For Use With: IRPLLNR7 - KIT UNIV ELEC BALLAST FLUOR LAMP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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I. Ballast Section
Functional Description
Undervoltage Lock-Out Mode (UVLO)
The undervoltage lock-out 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 7 of this document. The
IRS2166D undervoltage lock-out 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. Fig. 1 shows an efficient
supply voltage using the start-up current of the IRS2166D
together with a charge pump from the ballast output stage
(R
The start-up capacitor (C
through supply resistor (R
drawn by the IC. This resistor is chosen to set the line
input voltage turn-on threshold for the ballast. Once the
capacitor voltage on V
V
on and HO and LO begin to oscillate.
begins to discharge due to the increase in IC operating
current (Fig. 2).
During the discharge cycle, the rectified current from the
charge pump charges the capacitor above the IC turn-off
threshold. The charge pump and the internal 15.6 V
(V
voltage.
must be selected such that enough supply current is
available over all ballast operating conditions. A supply
capacitor (C
side driver circuitry.
supply is charged up before the first pulse on pin HO, the
first pulse from the output drivers comes from the LO pin.
During undervoltage lock-out mode, the high- and low-side
driver outputs HO and LO are both low, pin CT is
connected internally to COM to disable the oscillator, and
pin CPH is connected internally to COM for resetting the
preheat time.
CCUV
CLAMP
SUPPLY
+, and the SD pin is below 3.0 V (V
V
) zener clamp of the IC take over as the supply
V
BUS
, C
BUS
(+)
(-)
The start-up capacitor and snubber capacitor
VCC
Fig. 1: Start-up and supply circuitry
BOOT
, D
) comprises the supply voltage for the high
CP1
, and D
CC
To guarantee that the high-side
CC
SUPPLY
CP2
reaches the start-up threshold
16
15
14
13
12
11
is below the turn-on threshold
R
VCC
).
SUPPLY
HO
VS
VCC
VB
COM
LO
) is charged by current
) minus the start-up current
D
C
C
BOOT
R
BOOT
VCC
CS
M1
M2
SDTH-
D
Half-Bridge
CP1
QCCUV
The capacitor
Output
), the IC turns
C
D
SNUB
CP2
), and to
Preheat Mode (PH)
when the lamp filaments are being heated to their correct
emission temperature. This is necessary for maximizing
lamp life and reducing the required ignition voltage. The
IRS2166D enters preheat mode when V
UVLO positive-going threshold V
to oscillate at the preheat frequency with 50% duty cycle
and with a deadtime which is set by the value of the
external timing capacitor, C
resistor, R
internal 3.6 µA (I
external preheat timing capacitor on CPH linearly. The
over-current protection on pin CS is enabled during
preheat. The preheat frequency is determined by the
parallel combination of resistors R
with timing capacitor C
between 1/3 (V
Diagram, page 9). C
the parallel combination of R
internally to V
of CT from 1/3 to 3/5 V
output gate driver, HO or LO. Once C
MOSFET S1 is turned off, disconnecting R
V
internal resistor, R
discharge time of C
(both off) of the output gate drivers, HO and LO. The
selected value of C
deadtime (see Design Equations, page 15, Equations 1
and 2). Once C
is turned off, disconnecting R
S1 is turned on, connecting R
frequency remains at the preheat frequency until the
voltage on pin C
ignition mode. During the preheat mode, both the over-
current protection and the DC bus undervoltage reset are
enabled when pin C
The ignition mode is defined as the state the IC is in
when a high voltage is being established across the lamp
necessary for igniting the lamp. The IRS2166D enters
ignition mode when the voltage on pin CPH exceeds
10.8 V (V
The preheat mode is defined as the state the IC is in
Ignition Mode (IGN)
CC
. C
V
C1
T
Fig. 2: Supply capacitor (C
CPHEOP
is then discharged exponentially through an
DT
. Pin CPH is disconnected from COM and an
R
TIME
CONSTANT
V
V
SUPPLY
UVLO+
UVLO-
CC
). Pin CPH is connected internally to the
T
CT-
VHYST
& C
CPH
through MOSFET S1. The charge time
discharges below 1/3 V
PH
) and 3/5 (V
DT
VCC
T
PH
) current source (Fig. 3) charges the
, through MOSFET S3 to COM. The
T
from 3/5 to 1/3 V
exceeds 10 V and the IC enters
DISCHARGE
T
exceeds 12 V (V
CC
is charged exponentially through
C
and R
T
VCC
. C
is the on-time of the respective
IRS2166D(S)PbF
DT
T
T
T
and R
, and internal deadtime
charges and discharges
DT
from COM, and MOSFET
CT+
CCUV+
T
CHARGE PUMP
OUTPUT
) of V
program the desired
DISCHARGE
TIME
and R
VCC
T
PH
. HO and LO begin
T
INTERNAL VCC
ZENER CLAMP VOLTAGE
and R
CC
) voltage
CPHRUN
again to V
exceeds 3/5 V
CC
CC
is the deadtime
CC
T
, MOSFET S3
PH
and R
exceeds the
(see Timing
PH
).
connected
, together
CC
PH
t
. The
from
CC
,
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