TECHNICAL DATA
IL494
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.
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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
ORDERING INFORMATION
IL494N Plastic
IL494D SOIC
T
A
= -20°C to 85° C
for all packages
PIN ASSIGNMENT
FUNCTION TABLE
Output Control
Grounded
At V
ref
Output Function
Single-ended or Parallel Output
Normal Push-Pull Operation
LOGIC DIAGRAM
1
IL494
MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
Tstg
Supply Voltage
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current
Storage Temperature
Parameter
Value
41
V
CC
+0.3
41
250
-65 to +150
Unit
V
V
V
mA
°C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
Supply Voltage
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current (Each Transistor)
Current Into Feed back Terminal
C
T
R
T
T
A
Timing Capacitor
Timing Resistor
Oscillator Frequency
Operating Free-Air Temperature
0.47
1.8
1
-20
Parameter
Min
7
-0.3
Max
40
V
CC
- 2
40
200
0.3
10.000
500
300
+85
Unit
V
V
V
mA
mA
nF
KΩ
KHz
°C
2
IL494
ELECTRICAL CHARACTERISTICS
(Temperature -20
∼
85°C, V
CC
= 15 V, f=10 kHz))
Symbol
Reference Section
V
ref
V
regin
V
regout
∆V
ref
I
SC
Output Voltage
Output regulation
Input regulation
Output Voltage change with
temperature
Short-circuit output current
(Note 1)
Frequency
Standard deviation of
frequency (Note 2)
Frequency change with
voltage
Frequency change with
temperature
I
O
=1 mA
V
CC
=7 V to 40 V, T
A
=25°C
I
O
=1 to 10 mA, T
A
=25°C
T
A
= -20°C to 85°C
Vref=0
4.75
5.25
25
15
1
50
V
mV
mV
%
mA
Parameter
Test Conditions
Min
Max
Unit
Oscillator Section
f
OSC
δf
OSC
δf
OSC(∆V)
δf
OSC(∆T)
C
T
=0.01
µF,
R
T
=12 kΩ
All values of V
CC
, C
T
, R
T
, T
A
Constant
V
CC
= 7 V to 40 V,
T
A
=25°C
C
T
=0.01
µF,
R
T
=12 kΩ
T
A
= -20°C to 85°C
V
I
= 0 to 5.25 V
V
I(pin 4)
=0 V
Zero duty cycle
Maximum duty cycle
V
O(pin 3)
=2.5 V
V
O(pin 3)
=2.5 V
V
O(pin 3)
=2.5 V
V
CC
= 7 V to 40 V
LOW
HIGH
∆V
O
=3 V, V
O
=0.5 to 3.5 V
-0.3
V
CC
- 2
70
100
V
CC
=40 V, T
A
=25°C
V
ID
=-15 mV to -5 V,
V
O(pin 3)
=0.7 V
V
ID
=15 mV to 5 V,
V
O(pin 3)
=3.5 V
65
0.3
-2
dB
kHz
dB
mA
mA
0
10
250
1
mV
nA
µA
V
45
3.3
6
14
15
10
2
KHz
%
%
%
Dead Time Control Section
I
IB(2T)
DC
max
V
THD
Input bias current (pin 4)
Maximum duty cycle, each
output
Input threshold voltage
(pin 4)
Error Amp Section
V
IO
I
IO
I
IB
Input offset voltage
Input offset current
Input bias current
Common-mode input
voltage range
A
vol
f
b
CMRR
I
O
I
O+
Open-loop voltage
amplification
Unity-gain bandwidth
Common-mode rejection
ratio
Output sink current (pin 3)
Output source current (pin 3)
-10
µA
%
V
3
IL494
ELECTRICAL CHARACTERISTICS
(Temperature -20
∼
85°C, V
CC
= 15 V, f=10 kHz))
Symbol
V
THP
I
I
t
rc
t
fc
t
rf
t
ff
I
C(off)
I
E(off)
V
SAT
Parameter
Input threshold voltage
(pin 3)
Input sink current (pin 3)
Output voltage rise time
Output voltage fall time
Output voltage rise time
Output voltage fall time
Collector off-state current
Emitter off-state current
Collector-
emitter
saturation
voltage
I
OCH
I
CC
I
CCA
Total Device
Standby supply current
Average supply current
All other inputs &
outputs open
V
(pin 4)
=2 V
V
CC
=15 V
V
CC
=40 V
10
15
17
mA
mA
Common-
emitter
Emitter-
follower
Test Conditions
Zero duty cycle
V
O(pin 3)
=0.7 V
Common-emitter configuration
Common-emitter configuration
Emitter-follower configuration
Emitter-follower configuration
V
CE
=40 V, V
CC
=40 V
V
CC
=V
C
=40 V, V
E
=0
V
E
=0, I
C
=200 mA
V
C
=15 V, I
E
=-200 mA
V
I
=V
ref
0.3
200
100
200
100
100
-100
1.3
2.5
3.5
mA
Min
Max
4.5
Unit
V
mA
ns
ns
ns
ns
µA
µA
V
PWM Comparator Section
Switching Characteristics
Output Section
Output control input current
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
σ
=
N-1
4
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