TECHNICAL DATA
Power Factor Controllers
The 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.
IL34262
ORDERING INFORMATION
IL34262N Plastic
IL34262D SOIC
T
A
= 0° to 85° C for all packages.
• Overvoltage Comparator Eliminates Runaway
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
PIN CONNECTIONS
IL34262
MAXIMUM RATINGS
Rating
Total Power Supply and Zener Current
Output Current, Source or Sink
Current Sense, Multiplier, and Voltage Feedback Inputs
Zero Current Detect Input
High State Forward Current
Low State Reverse Current
Power Dissipation and Thermal Characteristics
N Suffix, Plastic Package
Maximum Power Dissipation @ T
A
=
70°C
Thermal Resistance, Junction-to-Air
D Suffix, Plastic Package
Maximum Power Dissipation @ T
A
=
70°C
Thermal Resistance, Junction-to-Air
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature
P
D
R
θJA
TJ
Symbol
(Icc + Iz)
lo
Vin
Iin
Value
30
500
-1.0 to +10
50
-10
Unit
mA
mA
V
mA
P
D
R
θJA
800
100
450
178
+150
0 to + 85
-65 to +150
mW
°C/W
mW
0
C/W
°C
°C
°C
T
A
Tstg
ELECTRICAL CHARACTERISTICS
(\/cc =12 V, for min/max values T
A
is the operating ambient
temperature range that applies unless otherwise noted.)
Characteristic
Symbol
V
FB
Min
Max
Unit
V
ERROR AMPLIFIER
Voltage Feedback Input Threshold
T
A
=25°C
T
A
= Tlow to Thigh (Vcc = 12 V to 28 V)
Line Regulation (V
CC
= 12 V to 28 V, T
A
= 25°C)
Input Bias Current (V
FB
= 0 V)
Transconductance (T
A
=
25°C)
Output Current
Source (V
FB
= 2.3 V)
Sink (V
FB
= 2.7 V)
Output Voltage Swing
High State (V
FB
= 2.3 V)
Low State (V
FB
= 2.7 V)
2.465
2.44
—
—
80
—
—
V
OH
(ea)
V
OL
(ea)
5.8
—
2.535
2.54
10
-0.5
130
—
—
V
—
2.4
Reg
line
I
IB
g
m
lo
mV
µA
µmho
µA
IL34262
Characteristic
Symbol
V
FB
(OV)
I
IB
Vth(M)
Vpin3
Vpin2
K
Min
1.065V
FB
—
1.05 V
OL(EA)
0 to 2.5 Vth(M) to
(Vth(M)+1.0)
0.43
Max
1.095V
FB
-0.5
—
—
—
0.87
Unit
V
µA
V
V
1/V
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)
ZERO CURRENT DETECTOR
Input Threshold Voltage (Vjn Increasing)
Hysteresis (Vin Decreasing)
Input Clamp Voltage
High State (I
DET
= + 3.0 mA)
High State (I
DET
= - 3.0 mA)
Vth
V
H
V
IH
V
IL
1.33
100
6.1
0.3
1.87
300
—
1.0
V
mV
V
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
I
IB
V
IO
V
th(max)
t
PHL(in/out)
—
—
1.3
—
-1.0
25
1.8
400
µA
mV
V
ns
V
V
OL
V
OH
V
O(max)
t
r
t
f
V
O(UVLO)
—
—
9.8
7.8
14
—
—
—
0.8
3.3
0.8
3.3
18
120
120
0.5
DRIVE OUTPUT
Output Voltage (V
CC
= 12 V)
Low State (I
sink
=
20 mA)
(I
sink
= 200 mA)
High State (I
source
= 20 mA)
(I
source
=
200 mA)
Output Voltage (V
CC
= 30 V)
High State (I
source
= 20 mA, C
L
= 15 pF)
Output Voltage Rise Time (C
L
1.0 nF)
Output Voltage Fall Time (C
L
1.0 nF)
Output Voltage with UVLO Activated
(Vcc = 7.0 V,l
Sink
= 1.0mA)
V
ns
ns
V
RESTART TIMER
Restart Time Delay
tDLY
200
—
µs
Note 1: This parameter is measured with V
FB
=0V, and V
Pin3
=3.0V
IL34262
Characteristic
Symbol
V
th(on)
V
Shutdown
V
H
I
CC
Min
11.5
7.0
3.8
—
Max
14.5
9.0
6.2
0.4
12
20
—
Unit
V
V
V
mA
UNDERVOLTAGE LOCKOUT
Startup Threshold (
V
CC
Increasing)
Minimum Operating Voltage After Turn-On (V
CC
Decreasing)
Hysteresis
TOTAL DEVICE
Power Supply Current
Startup (Vcc = 7.0 V)
Operating Dynamic Operating (50 kHz, C
L
= 1.0 nF)
Power Supply Zener Voltage (Ice = 25 mA)
V
Z
30
V
IL34262
<Design Equations>
APPLICATION INFORMATION
The application circuits shown in Figures 19, 20 and 21
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 19 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 20 and 21 are universal input
preconverter examples that operate over a continuous
input voltage range of 90 Vac to 268Vac. Figure 20
provides an output power of 175W (400V at 440mA)
while Figure 21 provides 450W (400V at 1.125A). Both
circuits have an observed worst-case power factor of
approximately 0.989. The input current and voltage
waveforms of Figure 20 are shown in Figure 22 with
operation at 115 Vac and 230 Vac. The data for each of
the applications was generated with the test set-up
shown in Figure 24.
PCB Design
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