TECHNICAL DATA
1
PWM Control Circuit
The IL494 incorporates on a single monolithic chip all the
functions required in the construction of a pulse-width-modulation
control circuit. Designed primarily for power supply control, the IL494
contains an on-chip 5-volt regulator, two error amplifiers, adjustable
oscillator, dead-time control comparator, pulse-steering flip-flop, and
output-control circuitry. The uncommitted output transistors provide
either common-emitter or emitter-follower output capability. Push-pull
or single-ended output operation may be selected through the output-
control function. The architecture of the IL494 prohibits the possibility
of either output being pulsed twice during push-pull operation.
Complete PWM Power Control Circuitry
Uncommitted Outputs for 200 mA Sink or Source
Output Control Selects Single-Ended or Push-Pull Operation
Internal Circuitry Prohibits Double Pulse at Either Output
Internal Regulator Provides a Stable 5 V Reference Supply
Variable Dead-Time Provides Control Over Total Range
IL494
ORDERING INFORMATION
IL494N Plastic
IL494D SOIC
T
A
= -20
C to 85
C
for all packages
PIN ASSIGNMENT
FUNCTION TABLE
Output Control
Output Function
Grounded
Single-ended or Parallel Output
At V
ref
Normal Push-Pull Operation
LOGIC DIAGRAM
IL494
2
MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
41
V
V
I
Amplifier Input Voltage
V
CC
+0.3
V
V
O
Collector Output Voltage
41
V
Collector Output Current
250
mA
Tstg
Storage Temperature
-65 to +150
C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
V
CC
Supply Voltage
7
40
V
V
I
Amplifier Input Voltage
-0.3
V
CC
- 2
V
V
O
Collector Output Voltage
40
V
Collector Output Current (Each Transistor)
200
mA
Current Into Feed back Terminal
0.3
mA
C
T
Timing Capacitor
0.47
10.000
nF
R
T
Timing Resistor
1.8
500
K
Oscillator Frequency
1
300
KHz
T
A
Operating Free-Air Temperature
-20
+85
C
IL494
3
ELECTRICAL CHARACTERISTICS
(Temperature -20
85
C, V
CC
= 15 V, f=10 kHz))
Symbol
Parameter
Test Conditions
Min
Max
Unit
Reference Section
V
ref
Output Voltage
I
O
=1 mA
4.75
5.25
V
V
regin
Output regulation
V
CC
=7 V to 40 V, T
A
=25
C
25
mV
V
regout
Input regulation
I
O
=1 to 10 mA, T
A
=25
C
15
mV
V
ref
Output Voltage change with
temperature
T
A
= -20
C to 85
C
1
%
I
SC
Short-circuit output current
(Note 1)
Vref=0
50
mA
Oscillator Section
f
OSC
Frequency
C
T
=0.01
F, R
T
=12 k
6
14
KHz
f
OSC
Standard deviation of
frequency (Note 2)
All values of V
CC
, C
T
, R
T
, T
A
Constant
15
%
f
OSC(
V)
Frequency change with
voltage
V
CC
= 7 V to 40 V,
T
A
=25
C
10
%
f
OSC(
T)
Frequency change with
temperature
C
T
=0.01
F, R
T
=12 k
T
A
= -20
C to 85
C
2
%
Dead Time Control Section
I
IB(2T)
Input bias current (pin 4)
V
I
= 0 to 5.25 V
-10
A
DC
max
Maximum duty cycle, each
output
V
I(pin 4)
=0 V
45
%
V
THD
Input threshold voltage
Zero duty cycle
3.3
V
(pin 4)
Maximum duty cycle
0
Error Amp Section
V
IO
Input offset voltage
V
O(pin 3)
=2.5 V
10
mV
I
IO
Input offset current
V
O(pin 3)
=2.5 V
250
nA
I
IB
Input bias current
V
O(pin 3)
=2.5 V
1
A
Common-mode input
V
CC
= 7 V to 40 V
LOW
-0.3
V
voltage range
HIGH
V
CC
- 2
A
vol
Open-loop voltage
amplification
V
O
=3 V, V
O
=0.5 to 3.5 V
70
dB
f
b
Unity-gain bandwidth
100
kHz
CMRR
Common-mode rejection
ratio
V
CC
=40 V, T
A
=25
C
65
dB
I
O
Output sink current (pin 3)
V
ID
=-15 mV to -5 V,
V
O(pin 3)
=0.7 V
0.3
mA
I
O+
Output source current (pin 3)
V
ID
=15 mV to 5 V,
V
O(pin 3)
=3.5 V
-2
mA
IL494
4
ELECTRICAL CHARACTERISTICS
(Temperature -20
85
C, V
CC
= 15 V, f=10 kHz))
Symbol
Parameter
Test Conditions
Min
Max
Unit
PWM Comparator Section
V
THP
Input threshold voltage
(pin 3)
Zero duty cycle
4.5
V
I
I
Input sink current (pin 3)
V
O(pin 3)
=0.7 V
0.3
mA
Switching Characteristics
t
rc
Output voltage rise time
Common-emitter configuration
200
ns
t
fc
Output voltage fall time
Common-emitter configuration
100
ns
t
rf
Output voltage rise time
Emitter-follower configuration
200
ns
t
ff
Output voltage fall time
Emitter-follower configuration
100
ns
Output Section
I
C(off)
Collector off-state current
V
CE
=40 V, V
CC
=40 V
100
A
I
E(off)
Emitter off-state current
V
CC
=V
C
=40 V, V
E
=0
-100
A
V
SAT
Collector-
emitter
Common-
emitter
V
E
=0, I
C
=200 mA
1.3
V
saturation
voltage
Emitter-
follower
V
C
=15 V, I
E
=-200 mA
2.5
I
OCH
Output control input current
V
I
=V
ref
3.5
mA
Total Device
I
CC
Standby supply current
All other inputs &
V
CC
=15 V
10
mA
outputs open
V
CC
=40 V
15
I
CCA
Average supply current
V
(pin 4)
=2 V
17
mA
Notes: 1. Duration of the short circuit should not exceed one second.
2. Standard deviation is a measure of the statistical disribution about the mean as derived from the formula
N
(x
n
- x)
2
n=1
=
N - 1
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