TL494, NCV494
SWITCHMODE™ Pulse Width
Modulation Control Circuit
The TL494 is a fixed frequency, pulse width modulation control
circuit designed primarily for SWITCHMODE power supply control.
Features
•
•
•
•
•
•
•
•
•
Complete Pulse Width Modulation Control Circuitry
On−Chip Oscillator with Master or Slave Operation
On−Chip Error Amplifiers
On−Chip 5.0 V Reference
Adjustable Deadtime Control
Uncommitted Output Transistors Rated to 500 mA Source or Sink
Output Control for Push−Pull or Single−Ended Operation
Undervoltage Lockout
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
•
Pb−Free Packages are Available*
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MARKING
DIAGRAMS
16
SOIC−16
D SUFFIX
CASE 751B
1
TL494xDG
AWLYWW
16
PDIP−16
*
N SUFFIX
CASE 648
1
TL494xN
AWLYYWWG
MAXIMUM RATINGS
(Full operating ambient temperature range applies,
unless otherwise noted.)
Rating
Power Supply Voltage
Collector Output Voltage
Collector Output Current
(Each transistor) (Note 1)
Amplifier Input Voltage Range
Power Dissipation @ T
A
≤
45°C
Thermal Resistance, Junction−to−Ambient
Operating Junction Temperature
Storage Temperature Range
Operating Ambient Temperature Range
TL494B
TL494C
TL494I
NCV494B
Derating Ambient Temperature
Symbol
V
CC
V
C1
,
V
C2
I
C1
, I
C2
V
IR
P
D
R
qJA
T
J
T
stg
T
A
−40 to +125
0 to +70
−40 to +85
−40 to +125
T
A
45
°C
Value
42
42
500
−0.3 to +42
1000
80
125
−55 to +125
Unit
V
V
mA
*This marking diagram also applies to NCV494.
V
mW
°C/W
°C
°C
°C
x
A
WL
YY, Y
WW, W
G
= B, C or I
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
Noninv
Input 1
Inv
Input 2
Compen/PWN
Comp Input 3
Deadtime
Control 4
C
T
5
Oscillator
+
Error 1
Amp
−
+
2 Error
Amp
−
V
CC
≈
0.1 V
5.0 V
REF
Noninv
16 Input
Inv
15 Input
14 V
ref
Output
13 Contro
l
12 V
CC
11 C2
R
T
6
Q2
Maximum ratings are those values beyond which device damage can occur.
Maximum ratings applied to the device are individual stress limit values (not
normal operating conditions) and are not valid simultaneously. If these limits are
exceeded, device functional operation is not implied, damage may occur and
reliability may be affected.
1. Maximum thermal limits must be observed.
Ground 7
C1 8
Q1
10 E2
9 E1
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 4 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
©
Semiconductor Components Industries, LLC, 2005
1
June, 2005 − Rev. 6
Publication Order Number:
TL494/D
TL494, NCV494
RECOMMENDED OPERATING CONDITIONS
Characteristics
Power Supply Voltage
Collector Output Voltage
Collector Output Current (Each transistor)
Amplified Input Voltage
Current Into Feedback Terminal
Reference Output Current
Timing Resistor
Timing Capacitor
Oscillator Frequency
Symbol
V
CC
V
C1
, V
C2
I
C1
, I
C2
V
in
l
fb
l
ref
R
T
C
T
f
osc
Min
7.0
−
−
−0.3
−
−
1.8
0.0047
1.0
Typ
15
30
−
−
−
−
30
0.001
40
Max
40
40
200
V
CC
− 2.0
0.3
10
500
10
200
Unit
V
V
mA
V
mA
mA
kW
mF
kHz
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V, C
T
= 0.01
mF,
R
T
= 12 kW, unless otherwise noted.)
For typical values T
A
= 25°C, for min/max values T
A
is the operating ambient temperature range that applies, unless otherwise noted.
Characteristics
REFERENCE SECTION
Reference Voltage (I
O
= 1.0 mA)
Line Regulation (V
CC
= 7.0 V to 40 V)
Load Regulation (I
O
= 1.0 mA to 10 mA)
Short Circuit Output Current (V
ref
= 0 V)
OUTPUT SECTION
Collector Off−State Current
(V
CC
= 40 V, V
CE
= 40 V)
Emitter Off−State Current
V
CC
= 40 V, V
C
= 40 V, V
E
= 0 V)
Collector−Emitter Saturation Voltage (Note 2)
Common−Emitter (V
E
= 0 V, I
C
= 200 mA)
Emitter−Follower (V
C
= 15 V, I
E
= −200 mA)
Output Control Pin Current
Low State (V
OC
v
0.4 V)
High State (V
OC
= V
ref
)
Output Voltage Rise Time
Common−Emitter (See Figure 12)
Emitter−Follower (See Figure 13)
Output Voltage Fall Time
Common−Emitter (See Figure 12)
Emitter−Follower (See Figure 13)
I
C(off)
I
E(off)
−
−
2.0
−
100
−100
mA
mA
V
V
sat(C)
V
sat(E)
I
OCL
I
OCH
t
r
−
−
t
f
−
−
25
40
100
100
100
100
200
200
ns
−
−
−
−
1.1
1.5
10
0.2
1.3
2.5
−
3.5
mA
mA
ns
V
ref
Reg
line
Reg
load
I
SC
4.75
−
−
15
5.0
2.0
3.0
35
5.25
25
15
75
V
mV
mV
mA
Symbol
Min
Typ
Max
Unit
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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2
TL494, NCV494
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V, C
T
= 0.01
mF,
R
T
= 12 kW, unless otherwise noted.)
For typical values T
A
= 25°C, for min/max values T
A
is the operating ambient temperature range that applies, unless otherwise noted.
Characteristics
ERROR AMPLIFIER SECTION
Input Offset Voltage (V
O (Pin 3)
= 2.5 V)
Input Offset Current (V
O (Pin 3)
= 2.5 V)
Input Bias Current (V
O (Pin 3)
= 2.5 V)
Input Common Mode Voltage Range (V
CC
= 40 V, T
A
= 25°C)
Open Loop Voltage Gain (DV
O
= 3.0 V, V
O
= 0.5 V to 3.5 V, R
L
= 2.0 kW)
Unity−Gain Crossover Frequency (V
O
= 0.5 V to 3.5 V, R
L
= 2.0 kW)
Phase Margin at Unity−Gain (V
O
= 0.5 V to 3.5 V, R
L
= 2.0 kW)
Common Mode Rejection Ratio (V
CC
= 40 V)
Power Supply Rejection Ratio (DV
CC
= 33 V, V
O
= 2.5 V, R
L
= 2.0 kW)
Output Sink Current (V
O (Pin 3)
= 0.7 V)
Output Source Current (V
O (Pin 3)
= 3.5 V)
PWM COMPARATOR SECTION
(Test Circuit Figure 11)
Input Threshold Voltage (Zero Duty Cycle)
Input Sink Current (V
(Pin 3)
= 0.7 V)
DEADTIME CONTROL SECTION
(Test Circuit Figure 11)
Input Bias Current (Pin 4) (V
Pin 4
= 0 V to 5.25 V)
Maximum Duty Cycle, Each Output, Push−Pull Mode
(V
Pin 4
= 0 V, C
T
= 0.01
mF,
R
T
= 12 kW)
(V
Pin 4
= 0 V, C
T
= 0.001
mF,
R
T
= 30 kW)
Input Threshold Voltage (Pin 4)
(Zero Duty Cycle)
(Maximum Duty Cycle)
OSCILLATOR SECTION
Frequency (C
T
= 0.001
mF,
R
T
= 30 kW)
Standard Deviation of Frequency* (C
T
= 0.001
mF,
R
T
= 30 kW)
Frequency Change with Voltage (V
CC
= 7.0 V to 40 V, T
A
= 25°C)
Frequency Change with Temperature (DT
A
= T
low
to T
high
)
(C
T
= 0.01
mF,
R
T
= 12 kW)
UNDERVOLTAGE LOCKOUT SECTION
Turn−On Threshold (V
CC
increasing, I
ref
= 1.0 mA)
TOTAL DEVICE
Standby Supply Current (Pin 6 at V
ref
, All other inputs and outputs open)
(V
CC
= 15 V)
(V
CC
= 40 V)
Average Supply Current
(C
T
= 0.01
mF,
R
T
= 12 kW, V
(Pin 4)
= 2.0 V)
(V
CC
= 15 V) (See Figure 12)
I
CC
−
−
−
5.5
7.0
7.0
10
15
mA
−
mA
V
th
5.5
6.43
7.0
V
f
osc
sf
osc
Df
osc
(DV)
Df
osc
(DT)
−
−
−
−
40
3.0
0.1
−
−
−
−
12
kHz
%
%
%
I
IB (DT)
DC
max
45
−
V
th
−
0
2.8
−
3.3
−
48
45
50
50
V
−
−2.0
−10
mA
%
V
TH
I
I−
−
0.3
2.5
0.7
4.5
−
V
mA
V
IO
I
IO
I
IB
V
ICR
A
VOL
f
C−
f
m
CMRR
PSRR
I
O−
I
O
+
70
−
−
65
−
0.3
2.0
−
−
−
2.0
5.0
−0.1
−0.3 to V
CC
−2.0
95
350
65
90
100
0.7
−4.0
−
−
−
−
−
−
−
10
250
−1.0
mV
nA
mA
V
dB
kHz
deg.
dB
dB
mA
mA
Symbol
Min
Typ
Max
Unit
* Standard deviation is a measure of the statistical distribution about the mean as derived from the formula,
s
N
S
(X
n
− X)
2
n=1
N−1
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3
TL494, NCV494
ORDERING INFORMATION
Device
TL494BD
TL494BDG
TL494BDR2
TL494BDR2G
TL494CD
TL494CDG
TL494CDR2
TL494CDR2G
TL494CN
TL494CNG
TL494IN
TL494ING
NCV494BDR2*
NCV494BDR2G*
Package
SOIC−16
SOIC−16
(Pb−Free)
SOIC−16
SOIC−16
(Pb−Free)
SOIC−16
SOIC−16
(Pb−Free)
SOIC−16
SOIC−16
(Pb−Free)
PDIP−16
PDIP−16
(Pb−Free)
PDIP−16
PDIP−16
(Pb−Free)
SOIC−16
SOIC−16
(Pb−Free)
Shipping
†
48 Units / Rail
48 Units / Rail
2500 Tape & Reel
2500 Tape & Reel
48 Units / Rail
48 Units / Rail
2500 Tape & Reel
2500 Tape & Reel
25 Units / Rail
25 Units / Rail
25 Units / Rail
25 Units / Rail
2500 Tape & Reel
2500 Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*NCV494: T
low
= −40°C, T
high
= +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and change
control.
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4
TL494, NCV494
Output Control
13
6
Oscillator
R
T
C
T
5
−
+
4
Deadtime
Control
0.7V
−
+
0.7mA
+
1
−
1
2
3
Feedback PWM
Comparator Input
2
PWM
Comparator
+
−
15
16
UV
Lockout
−
+
−
+
3.5V
14
Ref.
Output
7
Gnd
4.9V
Reference
Regulator
12
V
CC
Deadtime
Comparator
Ck
D
Flip−
Flop
Q
Q2 11
10
Q
Q1
8
9
V
CC
0.12V
Error Amp
1
Error Amp
2
This device contains 46 active transistors.
Figure 1. Representative Block Diagram
Capacitor C
T
Feedback/PWM Comp.
Deadtime Control
Flip−Flop
Clock Input
Flip−Flop
Q
Flip−Flop
Q
Output Q1
Emitter
Output Q2
Emitter
Output
Control
Figure 2. Timing Diagram
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