IR2166 International Rectifier, IR2166 Datasheet - Page 20

• Manufacturer Part Number: IR2166
• Description: IC PFC/BALLAST CONTROL 16-DIP
• Manufacturer: International Rectifier
• Type: PFC/Ballast Controllerr

Specifications of IR2166

• Frequency: 39 ~ 50 kHz
• Current - Supply: 10mA
• Current - Output: 400mA
• Voltage - Supply: 11.5 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): 250
• Output Sink Current Min (ma): 400
• Vcc Range (v): 10-25V with UVLO
• Output Voltage Min (v): 10
• Output Voltage Max (v): 25
• Pbf: PbF Option Available
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *IR2166

oscillate at the preheat frequency with 50% duty
cycle and with a dead-time which is set by the
value of the external timing capacitor, CT, and
internal deadtime resistor, RDT. Pin CPH is
disconnected from COM and an internal 3 A
current source (Figure 3)
charges the external preheat timing capacitor
on CPH linearly. The over-current protection on
pin CS is disabled during preheat. The preheat
frequency is determined by the parallel
combination of resistors RT and RPH, together
with timing capacitor CT. CT charges and
discharges between 1/3 and 3/5 of VCC (see
Timing Diagram, page 9). CT is charged
exponentially through the parallel combination
of RT and RPH connected internally to VCC
through MOSFET S1. The charge time of CT
from 1/3 to 3/5 VCC is the on-time of the
respective output gate driver, HO or LO. Once
CT exceeds 3/5 VCC, MOSFET S1 is turned
off, disconnecting RT and RPH from VCC. CT is
then discharged exponentially through an
internal resistor, RDT, through MOSFET S3 to
COM. The discharge time of CT from 3/5 to 1/3
IR2166 & (PbF)
20
V
V
BUS
BUS
(+)
(-)
C
C
R
R
CPH
T
T
PH
CPH
RPH
RT
CT
3
4
5
2
Figure 3, Preheat circuitry.
S4
3uA
OSC.
Bridge
Driver
Half-
IR2166
16
15
11
12
HO
VS
LO
COM
M2
M1
RCS
Bridge
Output
Load
Return
Half-
I
LOAD
VCC is the dead-time (both off) of the output
gate drivers, HO and LO. The selected value of
CT together with RDT therefore program the
desired dead-time (see Design Equations, page
26, Equations 1 and 2). Once CT discharges
below 1/3 VCC, MOSFET S3 is turned off,
disconnecting RDT from COM, and MOSFET
S1 is turned on, connecting RT and RPH again
to VCC. The frequency remains at the preheat
frequency until the voltage on pin CPH exceeds
10V and the IC enters Ignition Mode. During the
preheat mode, the over-current protection
together with the fault counter are enabled. The
peak ignition current must not exceed the
maximum allowable current ratings of the output
stage MOSFETs. Should this voltage exceed the
internal threshold of 1.3V, the internal FAULT
Counter begins counting the sequential over-
current faults (See Timing Diagram). If the
number of over-current faults exceed 25, the IC
will enter FAULT mode and gate driver outputs
HO, LO and PFC will be latched low.
V
V
BUS
BUS
(+)
(-)
C
R
R
C
CPH
T
PH
T
CPH
VCC
RPH
RT
CT
13
3
4
5
2
Figure 4, Ignition circuitry.
S4
S1
3uA
S3
Logic
OSC
Fault
Comp 4
Bridge
Driver
Half-
1.3V
IR2166
16
15
11
10
12
HO
VS
LO
CS
COM
C
CS
www.irf.com
R1
M1
M2
R
Output
Bridge
CS
Load
Return
Half-
I
LOAD