TEXAS INSTRUMENTS TL494 Technical data

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1 2 3 4 5 6 7 8
16 15 14 13 12 11 10
9
FEEDBACK
DTC
CT RT
GND
C1
CC
C2 E2 E1
D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
FEATURES
Complete PWM Power-Control Circuitry
Uncommitted Outputs for 200-mA Sink or
Source Current
Output Control Selects Single-Ended or
Push-Pull Operation
Internal Circuitry Prohibits Double Pulse at
Either Output
Variable Dead Time Provides Control Over
Total Range
Internal Regulator Provides a Stable 5-V
Reference Supply With 5% Tolerance
Circuit Architecture Allows Easy
Synchronization
DESCRIPTION
The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.
The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.
The error amplifiers exhibit a common-mode voltage range from –0.3 V to V comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits in synchronous multiple-rail power supplies.
The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.
The TL494C is characterized for operation from 0 ° C to 70 ° C. The TL494I is characterized for operation from –40 ° C to 85 ° C.
2 V. The dead-time control
CC
TL494
T
0 ° C to 70 ° C TL494CD TL494CN TL494CNS TL494CDB TL494CPW
–40 ° C to 85 ° C TL494ID TL494IN
(1) The D, DB, NS, and PW packages are available taped and reeled. Add the suffix R to device type (e.g., TL494CDR).
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
A
AVAILABLE OPTIONS
SMALL OUTLINE PLASTIC DIP SMALL OUTLINE
(D) (N) (NS)
PACKAGED DEVICES
(1)
SHRINK SMALL THIN SHRINK
OUTLINE SMALL OUTLINE
(DB) (PW)
Copyright © 1983–2005, Texas Instruments Incorporated
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GND
V
CC
Reference Regulator
C1
Pulse-Steering
Flip-Flop
C1
1D
DTC
CT
RT
PWM
Comparator
+
Error Amplifier 1
0.1 V
Dead-Time Control
Comparator
Oscillator
OUTPUT CTRL
(see Function Table)
0.7 mA
E1
C2
E2
+
Error Amplifier 2
1IN+
1IN−
2IN+
2IN−
FEEDBACK
REF
6 5
4
1 2
16 15
3
13
8
9
11 10
12
14
7
Q1
Q2
0.7 V
TL494 PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
INPUT TO
OUTPUT CTRL
FUNCTION TABLE
OUTPUT FUNCTION
VI= GND Single-ended or parallel output
VI= V
ref
Normal push-pull operation
FUNCTIONAL BLOCK DIAGRAM
2
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PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
V
CC
V
I
V
O
I
O
θ
JA
Supply voltage Amplifier input voltage V Collector output voltage 41 V Collector output current 250 mA
Package thermal impedance
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260 ° C
T
stg
Storage temperature range –65 150 ° C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) All voltages are with respect to the network ground terminal. (3) Maximum power disipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperatire is PD= (TJ(max) TA)/ θJA. Operating at the absolute maximum TJof 150 ° C can affect reliability. (4) The package thermal impedance is calculated in accordance with JESD 51-7.
(2)
(1)
MIN MAX UNIT
CC
D package 73 DB package 82
(3) (4)
N package 67 ° C/W NS package 64 PW package 108
TL494
41 V
+ 0.3 V
Recommended Operating Conditions
V
CC
V
I
V
O
f
OSC
C
T
R
T
T
A
Supply voltage 7 40 V Amplifier input voltage –0.3 V Collector output voltage 40 V Collector output current (each transistor) 200 mA Current into feedback terminal 0.3 mA Oscillator frequency 1 300 kHz Timing capacitor 0.47 10000 nF Timing resistor 1.8 500 k
Operating free-air temperature ° C
MIN MAX UNIT
TL494C 0 70 TL494I –40 85
CC
2 V
3
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N
n1
(xn X)
2
N 1
TL494 PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
Electrical Characteristics
over recommended operating free-air temperature range, V
Reference Section
PARAMETER TEST CONDITIONS
Output voltage (REF) IO= 1 mA 4.75 5 5.25 V Input regulation V Output regulation IO= 1 mA to 10 mA 1 15 mV Output voltage change with temperature TA= MIN to MAX 2 10 mV/V Short-circuit output current
(1) For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. (2) All typical values, except for parameter changes with temperature, are at TA= 25 ° C. (3) Duration of short circuit should not exceed one second.
(3)
Oscillator Section
CT= 0.01 µ F, RT= 12 k (see Figure 1 )
PARAMETER TEST CONDITIONS
Frequency 10 kHz Standard deviation of frequency Frequency change with voltage V Frequency change with temperature
(1) For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. (2) All typical values, except for parameter changes with temperature, are at TA= 25 ° C. (3) Standard deviation is a measure of the statistical distribution about the mean as derived from the formula:
(3)
(4)
All values of VCC, CT, RT, and TAconstant 100 Hz/kHz
= 7 V to 40 V, TA= 25 ° C 1 Hz/kHz
CC
TA= MIN to MAX 10 Hz/kHz
= 15 V, f = 10 kHz (unless otherwise noted)
CC
(1)
= 7 V to 40 V 2 25 mV
CC
REF = 0 V 25 mA
(1)
TL494C, TL494I
MIN TYP
TL494C, TL494I
MIN TYP
(2)
MAX
(2)
MAX
UNIT
UNIT
(4) Temperature coefficient of timing capacitor and timing resistor are not taken into account.
Error-Amplifier Section
See Figure 2
V
–0.3 to
CC
TL494C, TL494I
MIN TYP
2
(1)
MAX
PARAMETER TEST CONDITIONS UNIT
Input offset voltage VO(FEEDBACK) = 2.5 V 2 10 mV Input offset current VO(FEEDBACK) = 2.5 V 25 250 nA Input bias current VO(FEEDBACK) = 2.5 V 0.2 1 µ A
Common-mode input voltage range V Open-loop voltage amplification VO= 3 V, VO= 0.5 V to 3.5 V, RL= 2 k 70 95 dB
Unity-gain bandwidth VO= 0.5 V to 3.5 V, RL= 2 k 800 kHz Common-mode rejection ratio VO= 40 V, TA= 25 ° C 65 80 dB Output sink current (FEEDBACK) VID= –15 mV to –5 V, V (FEEDBACK) = 0.7 V 0.3 0.7 mA Output source current (FEEDBACK) VID= 15 mV to 5 V, V (FEEDBACK) = 3.5 V –2 mA
(1) All typical values, except for parameter changes with temperature, are at TA= 25 ° C.
4
= 7 V to 40 V V
CC
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PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
Electrical Characteristics
over recommended operating free-air temperature range, V
Output Section
PARAMETER TEST CONDITIONS MIN TYP
Collector off-state current V Emitter off-state current V
Collector-emitter saturation voltage V
Output control input current VI= V
(1) All typical values, except for temperature coefficient, are at TA= 25 ° C.
Common emitter VE= 0, IC= 200 mA 1.1 1.3 Emitter follower V
= 40 V, V
CE
= VC= 40 V, VE= 0 –100 µ A
CC
O(C1 or C2)
Dead-Time Control Section
See Figure 1
PARAMETER TEST CONDITIONS MIN TYP
Input bias current (DEAD-TIME CTRL) VI= 0 to 5.25 V –2 –10 µ A Maximum duty cycle, each output 45 %
Input threshold voltage (DEAD-TIME CTRL) V
(1) All typical values, except for temperature coefficient, are at TA= 25 ° C.
VI(DEAD-TIME CTRL) = 0, CT= 0.01 µ F, RT= 12 k
Zero duty cycle 3 3.3 Maximum duty cycle 0
= 15 V, f = 10 kHz (unless otherwise noted)
CC
= 40 V 2 100 µ A
CC
= 15 V, IE= –200 mA 1.5 2.5
ref
(1)
MAX UNIT
3.5 mA
(1)
MAX UNIT
TL494
PWM Comparator Section
See Figure 1
PARAMETER TEST CONDITIONS MIN TYP
Input threshold voltage (FEEDBACK) Zero duty cyle 4 4.5 V Input sink current (FEEDBACK) V (FEEDBACK) = 0.7 V 0.3 0.7 mA
(1) All typical values, except for temperature coefficient, are at TA= 25 ° C.
(1)
MAX UNIT
Total Device
PARAMETER TEST CONDITIONS MIN TYP
V
= 15 V 6 10
Standby supply current mA
Average supply current VI(DEAD-TIME CTRL) = 2 V, See Figure 1 7.5 mA
(1) All typical values, except for temperature coefficient, are at TA= 25 ° C.
RT= V All other inputs and outputs open
,
ref
CC
V
= 40 V 9 15
CC
(1)
MAX UNIT
Switching Characteristics
TA= 25 ° C
PARAMETER TEST CONDITIONS MIN TYP
Rise time 100 200 ns Fall time 25 100 ns Rise time 100 200 ns Fall time 40 100 ns
Common-emitter configuration, See Figure 3
Emitter-follower configuration, See Figure 4
(1)
MAX UNIT
(1) All typical values, except for temperature coefficient, are at TA= 25 ° C.
5
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Test
Inputs
DTC FEEDBACK
RT CT
GND
50 k
12 k
0.01 µF
V
CC
REF
OUTPUT CTRL
E2
C2
E1
C1
Output 1
Output 2
150 2 W
150 2 W
VCC = 15 V
TEST CIRCUIT
1IN+
V
CC
V
CC
0 V
0 V
Voltage
at C1
Voltage
at C2
Voltage
at CT
DTC
FEEDBACK
0 V
0.7 V 0%
MAX
0%
Threshold Voltage
Threshold Voltage
VOLTAGE WA VEFORMS
Duty Cycle
Error Amplifiers
7
14
12
8 9
11
10
4 3
6
5
1 2 16 15
13
1IN−
2IN−
2IN+
TL494 PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
PARAMETER MEASUREMENT INFORMATION
6
Figure 1. Operational Test Circuit and Waveforms
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PARAMETER MEASUREMENT INFORMATION
+
+
V
I
V
ref
FEEDBACK
Amplifier Under Test
Other Amplifier
Output
Each Output Circuit
68 2 W
15 V
CL = 15 pF (See Note A)
90%
10%
90%
10%
t
f
t
r
TEST CIRCUIT OUTPUT VOLTAGE WAVEFORM
NOTE A: CL includes probe and jig capacitance.
Output
Each Output Circuit
68 2 W
15 V
CL = 15 pF
(See Note A)
90%
10%
90%
10%
t
f
t
r
TEST CIRCUIT OUTPUT VOLTAGE WAVEFORM
NOTE A: CL includes probe and jig capacitance.
Figure 2. Amplifier Characteristics
TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
Figure 3. Common-Emitter Configuration
Figure 4. Emitter-Follower Configuration
7
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Df = 1%
40
10
100
1 k 4 k 10 k 40 k 100 k 400 k 1 M
f − Oscillator Frequency and Frequency Variation − Hz
OSCILLATOR FREQUENCY AND
FREQUENCY VARIATION
vs
TIMING RESISTANCE
400
1 k
4 k
10 k
40 k
100 k
RT − Timing Resistance −
0.1 µF
−2%
−1%
0%
0.01 µF
0.001 µF
VCC = 15 V TA = 25°C
CT = 1 µF
Frequency variation (f) is the change in oscillator frequency that occurs over the full temperature range.
10
0
100
20
1 10 100 1 M
A − Amplifier V oltage Amplification − dB
30
f − Frequency − Hz
AMPLIFIER VOLT AGE AMPLIFICATION
vs
FREQUENCY
1 k
VCC = 15 V VO = 3 V TA = 25°C
10 k
40
50
60
70
80
90
100 k
TL494 PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
TYPICAL CHARACTERISTICS
Figure 5.
8
Figure 6.
PACKAGE OPTION ADDENDUM
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17-Oct-2005
PACKAGING INFORMATION
Orderable Device Status
TL494CD ACTIVE SOIC D 16 40 Green (RoHS &
TL494CDBR ACTIVE SSOP DB 16 2000 Green (RoHS &
TL494CDBRE4 ACTIVE SSOP DB 16 2000 Green (RoHS &
TL494CDE4 ACTIVE SOIC D 16 40 Green (RoHS &
TL494CDR ACTIVE SOIC D 16 2500 Green (RoHS &
TL494CDRE4 ACTIVE SOIC D 16 2500 Green (RoHS &
TL494CJ OBSOLETE CDIP J 16 TBD Call TI Call TI
TL494CN ACTIVE PDIP N 16 25 Pb-Free
TL494CNE4 ACTIVE PDIP N 16 25 Pb-Free
TL494CNSR ACTIVE SO NS 16 2000 Green (RoHS &
TL494CNSRG4 ACTIVE SO NS 16 2000 Green (RoHS &
TL494CPW ACTIVE TSSOP PW 16 90 Green (RoHS &
TL494CPWG4 ACTIVE TSSOP PW 16 90 Green (RoHS &
TL494CPWLE OBSOLETE TSSOP PW 16 TBD Call TI Call TI
TL494CPWR ACTIVE TSSOP PW 16 2000 Green (RoHS &
TL494CPWRG4 ACTIVE TSSOP PW 16 2000 Green (RoHS &
TL494ID ACTIVE SOIC D 16 40 Green (RoHS &
TL494IDE4 ACTIVE SOIC D 16 40 Green (RoHS &
TL494IDR ACTIVE SOIC D 16 2500 Green (RoHS &
TL494IDRE4 ACTIVE SOIC D 16 2500 Green (RoHS &
TL494IN ACTIVE PDIP N 16 25 Pb-Free
TL494INE4 ACTIVE PDIP N 16 25 Pb-Free
TL494MJ OBSOLETE CDIP J 16 TBD Call TI Call TI
TL494MJB OBSOLETE CDIP J 16 TBD Call TI Call TI
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
(1)
Package
Type
Package Drawing
Pins Package
Qty
Eco Plan
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
no Sb/Br)
(RoHS)
(RoHS)
(RoHS)
(RoHS)
(2)
Lead/Ball Finish MSL Peak Temp
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-NC-NC-NC
CU NIPDAU Level-NC-NC-NC
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-1-260C-UNLIM
CU NIPDAU Level-NC-NC-NC
CU NIPDAU Level-NC-NC-NC
(3)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
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PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
17-Oct-2005
Addendum-Page 2
MECHANICAL DATA
MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001
DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE
28 PINS SHOWN
0,65
28
1
2,00 MAX
0,38 0,22
15
14
A
0,05 MIN
0,15
5,60 5,00
M
8,20 7,40
Seating Plane
0,10
0,25 0,09
0°ā8°
Gage Plane
0,25
0,95 0,55
PINS **
DIM
A MAX
A MIN
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice. C. Body dimensions do not include mold flash or protrusion not to exceed 0,15. D. Falls within JEDEC MO-150
14
6,50
6,50
5,905,90
2016
7,50
6,90
24
8,50
28
10,50
9,907,90
30
10,50
9,90
38
12,90
12,30
4040065 /E 12/01
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
MECHANICAL DATA
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999
PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE
14 PINS SHOWN
0,65
1,20 MAX
14
0,30 0,19
8
4,50 4,30
PINS **
7
Seating Plane
0,15
0,05
8
1
A
DIM
6,60 6,20
14
0,10
M
0,10
0,15 NOM
0°–8°
2016
Gage Plane
24
0,25
0,75 0,50
28
A MAX
A MIN
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice. C. Body dimensions do not include mold flash or protrusion not to exceed 0,15. D. Falls within JEDEC MO-153
3,10
2,90
5,10
4,90
5,10
4,90
6,60
6,40
7,90
7,70
9,80
9,60
4040064/F 01/97
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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