IL34262 01 1

TECHNICAL DATA
Power Factor Controllers
There are active power factor controllers specifically
designed for use as a preconverter in electronic ballast and in
off-line power converter applications.
These integrated circuits feature an internal startup timer
for stand-alone applications, a one quadrant multiplier for
near unity power factor, zero current detector to ensure
critical conduction operation, transconductance error
amplifier, quick
start circuit for enhanced startup, trimmed internal bandgap
reference, current sensing comparator, and a totem pole
output ideally suited for driving a power MOSFET.
Also included are protective features consisting of an
overvoltage comparator to eliminate runaway output voltage
due to load removal, input undervoltage lockout with
hysteresis, cycle-by-cycle current limiting, multiplier output
clamp that limits maximum peak switch current, an RS latch
for single pulse metering, and a drive output high state clamp
for MOSFET gate protection. These devices are available in
dual-in-line and surface mount plastic packages.
• Overvoltage Comparator Eliminates Runaway
IL34262
ORDERING INFORMATION
IL34262N DIP
IL34262D SOP
TA = 0 to 85 C for all packages.
PIN CONNECTIONS
Output Voltage
• Internal Startup Timer
• One Quadrant Multiplier
• Zero Current Detector
• Trimmed 2% Internal Bandgap Reference
• Totem Pole Output with High State Clamp
• Undervoltage Lockout with 6.0 V of Hysteresis
• Low Startup and Operating Current
• Supersedes Functionality of SG3561, TDA4817
and MC34262
2011, February, Rev. 01
IL34262
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Total Power Supply and Zener Current
(Icc + Iz)
30
mA
Output Current, Source or Sink
lo
500
mA
Current Sense, Multiplier, and Voltage Feedback Inputs
Vin
-1.0 to +10
V
Zero Current Detect Input
Iin
mA
High State Forward Current
50
Low State Reverse Current
-10
Power Dissipation and Thermal Characteristics
N Suffix, Plastic Package
Maximum Power Dissipation @ TA = 70°C
PD
800
mW
Thermal Resistance, Junction-to-Air
RJA
100
°C/W
Maximum Power Dissipation @ TA = 70°C
PD
450
mW
Thermal Resistance, Junction-to-Air
RJA
178
0
Operating Junction Temperature
TJ
+150
°C
Operating Ambient Temperature
TA
0 to + 85
°C
Storage Temperature
Tstg
-65 to +150
°C
D Suffix, Plastic Package
C/W
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those
indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS (\/cc =12 V, for min/max values TA is the operating ambient
temperature range that applies unless otherwise noted.)
Characteristic
Symbol
Min
Max
2.465
2.44
—
—
80
2.535
2.54
10
-0.5
130
—
—
—
—
Unit
ERROR AMPLIFIER
Voltage Feedback Input Threshold
TA=25°C
TA = T low to T high (Vcc = 12 V to 28 V)
Line Regulation (VCC = 12 V to 28 V, T A = 25°C)
Input Bias Current (VFB = 0 V)
Transconductance (TA = 25°C)
Output Current
Source (VFB = 2.3 V)
Sink (VFB = 2.7 V)
Output Voltage Swing
High State (VFB = 2.3 V)
Low State (VFB = 2.7 V)
VFB
Regline
IIB
gm
V
mV
A
mho
A
lo
V
VOH(ea)
VOL(ea)
5.8
—
—
2.4
2011, February, Rev. 01
IL34262
Characteristic
Symbol
Min
Max
Unit
VFB(OV)
1.065VFB
1.095VFB
V
IIB
Vth(M)
—
1.05 VOL(EA)
-0.5
—
A
V
Vpin3
Vpin2
K
0 to 2.5 Vth(M) to
(Vth(M)+1.0)
V
0.43
—
—
0.87
Vth
VH
VIH
VIL
1.33
100
6.1
0.3
1.87
300
—
1.0
V
mV
V
IIB
VIO
Vth(max)
—
—
1.3
—
-1.0
25
1.8
400
A
mV
V
ns
—
—
9.8
7.8
14
0.8
3.3
0.8
3.3
18
V
VO(UVLO)
—
—
—
120
120
0.5
ns
ns
V
tDLY
200
—
s
OVERVOLTAGE COMPARATOR
Voltage Feedback Input Threshold
MULTIPLIER
Input Bias Current, Pin 3 (VFB = 0 V)
Input Threshold, Pin 2
Dynamic Input Voltage Range
Multiplier Input (Pin 3)
Compensation (Pin 2)
Multiplier Gain (Vpin 3 = 0.5 V, Vpin 2 = Vth(M) +
1.0 V)
1/V
ZERO CURRENT DETECTOR
Input Threshold Voltage (Vjn Increasing)
Hysteresis (Vin Decreasing)
Input Clamp Voltage
High State (IDET = + 3.0 mA)
Low State (IDET = - 3.0 mA)
CURRENT SENSE COMPARATOR
Input Bias Current (Vpin 4 = 0 V)
Input Offset Voltage (Vpm 2 = 1.6 V, Vpm 3 = 0 V)
Maximum Current Sense Input Threshold (Note 1)
Delay to Output
tPHL(in/out)
DRIVE OUTPUT
Output Voltage (VCC = 12 V)
Low State (Isink = 20 mA)
(Isink = 200 mA)
High State (Isource = 20 mA)
(Isource = 200 mA)
Output Voltage (VCC = 30 V)
High State (Isource = 20 mA, CL = 15 pF)
Output Voltage Rise Time (CL 1.0 nF)
Output Voltage Fall Time (CL 1.0 nF)
Output Voltage with UVLO Activated
(Vcc = 7.0 V,lSink= 1.0mA)
V
VOL
VOH
VO(max)
tr
tf
RESTART TIMER
Restart Time Delay
Note 1: This parameter is measured with VFB =0V, and VPin3=3.0V
2011, February, Rev. 01
IL34262
Characteristic
Symbol
Min
Max
Unit
Vth(on)
VShutdown
11.5
7.0
14.5
9.0
V
V
VH
3.8
6.2
V
ICC
—
mA
VZ
30
0.4
12
20
—
UNDERVOLTAGE LOCKOUT
Startup Threshold (VCC Increasing)
Minimum Operating Voltage After Turn-On (VCC
Decreasing)
Hysteresis
TOTAL DEVICE
Power Supply Current
Startup (Vcc = 7.0 V)
Operating Dynamic Operating (50 kHz, CL = 1.0 nF)
Power Supply Zener Voltage (Ice = 25 mA)
V
2011, February, Rev. 01
IL34262
<Design Equations>
APPLICATION INFORMATION
The application circuits shown in Figures 1, 2 and 3
reveal that few external components are required for a
complete power factor preconverter. Each circuit is a
peak detecting current-mode boost converter that
operates in critical conduction mode with a fixed on-time
and variable off-time. A major benefit of critical
conduction operation is that the current loop is inherently
stable, thus elimination the need for ramp compensation.
The application in Figure 1 operates over an input
voltage range if 90 Vac to 138 Vac and provides an
output power of 80W (230V at 350mA) with an
associated power factor of approximately 0.998 at
nominal line. Figures 2 and 3 are universal input
preconverter examples that operate over a continuous
input voltage range of 90 Vac to 268Vac. Figure 2
provides an output power of 175W (400V at 440mA)
while Figure 3 provides 450W (400V at 1.125A). Both
circuits have an observed worst-case power factor of
approximately 0.989.
2011, February, Rev. 01
IL34262
Figure 1. 80W Power Factor Controller
2011, February, Rev. 01
IL34262
Figure 2. 175W Universal Input Power Factor Controller
2011, February, Rev. 01
IL34262
Figure 3. 450W Universal Input Power Factor Controller
2011, February, Rev. 01
IL34262
2011, February, Rev. 01