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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.
•
•
•
•
•
•
•
•
•
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
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MARKING
DIAGRAMS
16
16
1
SO−16
D SUFFIX
CASE 751B
1
16
PDIP−16
N SUFFIX
CASE 648
16
1
x
= B, C or I
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
*This marking diagram also applies to NCV494.
1
TL494xN
AWLYYWW
TL494xD
AWLYWW
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
1. Maximum thermal limits must be observed.
Symbol
V
CC
V
C1
,
V
C2
I
C1
, I
C2
V
IR
P
D
R
qJA
T
J
T
stg
T
A
Value
42
42
500
−0.3
to +42
1000
80
125
−55
to +125
−40
to +125
0 to +70
−40
to +85
−40
to +125
45
Unit
V
V
mA
V
mW
°C/W
°C
°C
°C
Device
TL494BD
°C
TL494BDR2
TL494CD
TL494CDR2
TL494CN
TL494IN
NCV494BDR2*
*
ORDERING INFORMATION
Package
SO−16
SO−16
SO−16
SO−16
PDIP−16
PDIP−16
SO−16
Shipping
†
48 Units/Rail
2500 Tape & Reel
48 Units/Rail
2500 Tape & Reel
25 Units/Rail
25 Units/Rail
2500 Tape & Reel
T
A
PIN CONNECTIONS
Noninv
Input 1
Inv
Input 2
Compen/PWN
Comp Input 3
Deadtime
Control 4
C
T
5
R
T
6
Ground 7
C1 8
Q1
+
Error 1
Amp
−
+
2 Error
Amp
−
5.0 V
REF
Noninv
16 Input
Inv
15 Input
14 V
ref
Output
13 Contro
l
12 V
CC
V
CC
≈
0.1 V
Oscillator
Q2
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
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.
11 C2
10 E2
9 E1
(Top View)
©
Semiconductor Components Industries, LLC, 2004
April, 2004
−
Rev. 5
843
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
−
−
−
−
−
−
−
−
1.1
1.5
10
0.2
100
100
25
40
1.3
2.5
−
3.5
200
200
ns
100
100
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
t
f
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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844
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 (D V
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 (D V
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 (D T
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
mA
−
−
−
5.5
7.0
7.0
10
15
mA
−
V
th
5.5
6.43
7.0
V
f
osc
sf
osc
D
f
osc
(D V)
D
f
osc
(D T)
−
−
−
−
40
3.0
0.1
−
−
−
−
12
kHz
%
%
%
I
IB (DT)
DC
max
−
45
−
−
0
−2.0
48
45
2.8
−
−10
50
50
V
3.3
−
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
V
th
* 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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845
TL494, NCV494
Output Control
13
6
Oscillator
R
T
C
T
5
0.12V
4
Deadtime
Control
0.7V
-
+
0.7mA
+
-
1
2
-
PWM
Comparator
+
-
15
16
UV
Lockout
+
-
+
3.5V
14
Ref.
Output
7
Gnd
4.9V
Reference
Regulator
12
V
CC
-
+
Deadtime
Comparator
D
Flip-
Flop
Ck
Q
Q
Q1
8
9
V
CC
Q2 11
10
1
2
3
Feedback PWM
Comparator Input
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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846
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