TL494-TI

12345678

161514131211109

1IN+1IN−

FEEDBACK

DTC CT RT GND C1

2IN+2IN−REF

OUTPUT CTRL V CC C2E2E1

D, DB, N, NS, OR PW PACKAGE

(TOP VIEW)

DESCRIPTION

•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

The TL494incorporates 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 TL494contains 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 –0.3V to V CC –2V.The dead-time control 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 TL494provides 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.

AVAILABLE OPTIONS

PACKAGED DEVICES (1)

SHRINK SMALL

THIN SHRINK T A SMALL OUTLINE

PLASTIC DIP

SMALL OUTLINE

OUTLINE SMALL OUTLINE

(D)

(N)(NS)

(DB)(PW)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).

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.

PRODUCTION DATA information is current as of publication date.Copyright ©1983–2005,Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas Instruments standard warranty.Production processing does not necessarily include testing of all parameters.

GND

V CC

C1E1

C2E2

FEEDBACK

REF

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

FUNCTION TABLE

INPUT TO OUTPUT FUNCTION OUTPUT CTRL V I =GND Single-ended or parallel output V I =V ref

Normal push-pull operation

FUNCTIONAL BLOCK DIAGRAM

2

Absolute Maximum Ratings (1)

Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN

MAX UNIT V CC Supply voltage (2)41

V V I Amplifier input voltage V CC +0.3

V V O Collector output voltage 41V I O

Collector output current

250mA

D package 73DB package

82θJA

Package thermal impedance (3)(4)

N package 67°C/W NS package PW package

108Lead temperature 1,6mm (1/16inch)from case for 10seconds

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 T J (max),θJA ,and T A .The maximum allowable power dissipation at any allowable ambient temperatire is P D =(T J (max)–T A )/θJA .Operating at the absolute maximum T J of 150°C can affect reliability.(4)

The package thermal impedance is calculated in accordance with JESD 51-7.

MIN

MAX UNIT V CC Supply voltage 740V V I Amplifier input voltage –0.3

V CC –2

V V O

Collector output voltage

40V Collector output current (each transistor)200mA Current into feedback terminal

0.3mA f OSC Oscillator frequency 1300kHz C T Timing capacitor 0.4710000nF R T Timing resistor

1.8500k ΩTL494C 070T A

Operating free-air temperature

°C

TL494I

–4085

3

s +ȍN

n +1

(x n *X)2

N *1

Ǹ

Electrical Characteristics

Reference Section

Oscillator Section

Error-Amplifier Section

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

over recommended operating free-air temperature range,V CC =15V,f =10kHz (unless otherwise noted)

TL494C,TL494I PARAMETER

TEST CONDITIONS (1)UNIT MIN TYP (2)MAX Output voltage (REF)I O =1mA 4.75

5 5.25V Input regulation V CC =7V to 40V 225mV Output regulation

I O =1mA to 10mA 115mV Output voltage change with temperature ∆T A =MIN to MAX 210

mV/V Short-circuit output current (3)REF =0V

25

mA

(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 T A =25°C.(3)

Duration of short circuit should not exceed one second.

C T =0.01µF,R T =12k Ω(see Figure 1)

TL494C,TL494I PARAMETER

TEST CONDITIONS (1)

UNIT MIN TYP (2)

MAX

Frequency

10kHz Standard deviation of frequency (3)All values of V CC ,C T ,R T ,and T A constant 100Hz/kHz Frequency change with voltage V CC =7V to 40V,T A =25°C 1

Hz/kHz Frequency change with temperature (4)∆T A =MIN to MAX

10Hz/kHz

(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 T A =25°C.

(3)

Standard deviation is a measure of the statistical distribution about the mean as derived from the formula:

(4)

Temperature coefficient of timing capacitor and timing resistor are not taken into account.

See Figure 2

TL494C,TL494I PARAMETER

TEST CONDITIONS

UNIT MIN TYP (1)

MAX Input offset voltage V O (FEEDBACK)=2.5V 210mV Input offset current V O (FEEDBACK)=2.5V 25250nA Input bias current

V O (FEEDBACK)=2.5V 0.2

1

µA –0.3to Common-mode input voltage range V CC =7V to 40V

V V CC –2

Open-loop voltage amplification ∆V O =3V,V O =0.5V to 3.5V,R L =2k Ω70

95dB Unity-gain bandwidth V O =0.5V to 3.5V,R L =2k Ω800kHz Common-mode rejection ratio ∆V O =40V,T A =25°C

6580dB Output sink current (FEEDBACK)V ID =–15mV to –5V,V (FEEDBACK)=0.7V 0.30.7

mA Output source current (FEEDBACK)V ID =15mV to 5V,V (FEEDBACK)=3.5V

–2mA

(1)

All typical values,except for parameter changes with temperature,are at T A =25°C.

4

Electrical Characteristics

Output Section

Dead-Time

Control

Section

PWM Comparator Section

Total Device

Switching Characteristics

over recommended operating free-air temperature range,V CC =15V,f =10kHz (unless otherwise noted)

PARAMETER

TEST CONDITIONS MIN

TYP (1)

MAX UNIT Collector off-state current V CE =40V,V CC =40V 2

100µA Emitter off-state current

V CC =V C =40V,V E =0–100µA Common emitter V E =0,I C =200mA

1.1 1.3Collector-emitter saturation voltage V Emitter follower

V O(C1or C2)=15V,I E =–200mA 1.5

2.5Output control input current V I =V ref

3.5

mA

(1)

All typical values,except for temperature coefficient,are at T A =25°C.

See Figure 1

PARAMETER

TEST CONDITIONS

MIN TYP (1)

MAX UNIT Input bias current (DEAD-TIME CTRL)V I =0to 5.25V

–2–10

µA V I (DEAD-TIME CTRL)=0,C T =0.01µF,Maximum duty cycle,each output

45%R T =12k ΩZero duty cycle 3

3.3Input threshold voltage (DEAD-TIME CTRL)V

Maximum duty cycle

0(1)

All typical values,except for temperature coefficient,are at T A =25°C.

See Figure 1

PARAMETER

TEST CONDITIONS

MIN TYP (1)

MAX UNIT Input threshold voltage (FEEDBACK)Zero duty cyle

4 4.5

V Input sink current (FEEDBACK)V (FEEDBACK)=0.7V

0.3

0.7

mA

(1)

All typical values,except for temperature coefficient,are at T A =25°C.

(1)

All typical values,except for temperature coefficient,are at T A =25°C.

T A =25°C

(1)

All typical values,except for temperature coefficient,are at T A =25°C.

5

PARAMETER MEASUREMENT INFORMATION

Test Inputs

Output 1

Output 2ΩTEST CIRCUIT

V CC V CC 0 V 0 V

Voltage at C1Voltage at C2

Voltage at CT

DTC FEEDBACK

0 V

0.7 V VOLTAGE WAVEFORMS

Duty Cycle

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

Figure 1.Operational Test Circuit and Waveforms

6

www.ti.com PARAMETER MEASUREMENT INFORMATION

V I

FEEDBACK

Output

= 15 pF

TEST CIRCUIT

OUTPUT VOLTAGE WAVEFORM

NOTE A:C L

includes probe and jig capacitance.

Output

TEST CIRCUIT

OUTPUT VOLTAGE WAVEFORM

NOTE A:C L includes probe and jig capacitance.TL494PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

Figure 2.Amplifier Characteristics

Figure 3.Common-Emitter Configuration

Figure 4.Emitter-Follower Configuration

www.ti.com

TYPICAL CHARACTERISTICS

1 k 4 k 10 k 40 k 100 k 400 k 1 M

f − O s c i l l a t o r F r e q u e n c y a n d F r e q u e n c y V a r i a t i o n − H z

OSCILLATOR FREQUENCY AND

FREQUENCY VARIATION †

vs

R T − Timing Resistance − Ω

†Frequency variation (∆f) is the change in oscillator frequency that occurs over the full temperature range.

A − A m p l i f i e r V o l t a g e A m p l i f i c a t i o n − d

B f − Frequency − Hz

AMPLIFIER VOLTAGE AMPLIFICATION

vs

FREQUENCY

TL494PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005Figure 5.

Figure 6.

PACKAGING INFORMATION

Orderable Device Status(1)Package

Type Package

Drawing

Pins Package

Qty

Eco Plan(2)Lead/Ball Finish MSL Peak Temp(3)

TL494CD ACTIVE SOIC D10Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CDBR ACTIVE SSOP DB162000Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CDBRE4ACTIVE SSOP DB162000Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CDE4ACTIVE SOIC D10Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CDR ACTIVE SOIC D162500Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CDRE4ACTIVE SOIC D162500Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM TL494CJ OBSOLETE CDIP J16TBD Call TI Call TI

TL494CN ACTIVE PDIP N1625Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

TL494CNE4ACTIVE PDIP N1625Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

TL494CNSR ACTIVE SO NS162000Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CNSRG4ACTIVE SO NS162000Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CPW ACTIVE TSSOP PW1690Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CPWG4ACTIVE TSSOP PW1690Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM TL494CPWLE OBSOLETE TSSOP PW16TBD Call TI Call TI

TL494CPWR ACTIVE TSSOP PW162000Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494CPWRG4ACTIVE TSSOP PW162000Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494ID ACTIVE SOIC D10Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494IDE4ACTIVE SOIC D10Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494IDR ACTIVE SOIC D162500Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494IDRE4ACTIVE SOIC D162500Green(RoHS&

no Sb/Br)

CU NIPDAU Level-1-260C-UNLIM

TL494IN ACTIVE PDIP N1625Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

TL494INE4ACTIVE PDIP N1625Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC TL494MJ OBSOLETE CDIP J16TBD Call TI Call TI

TL494MJB OBSOLETE CDIP J16TBD 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.

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 all6substances,including the requirement that lead not exceed0.1%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 exceed0.1%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.

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