TL494D芯片引脚定义引脚图及功能IC贸易商引脚图技术参数-中国IC网-芯三七

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

FEATURES

D, DB, N, NS, OR PW PACKAGE

(TOP VIEW)

•

Complete PWM Power-Control Circuitry

•

Uncommitted Outputs for 200-mA Sink or

Source Current

1IN+

1IN−

2IN+

2IN−

1

2

3

4

5

6

7

8

16

15

•

Output Control Selects Single-Ended or

Push-Pull Operation

FEEDBACK

DTC

14 REF

13

12

11

10

9

OUTPUT CTRL

Internal Circuitry Prohibits Double Pulse at

Either Output

CT

V

CC

RT

C2

E2

E1

Variable Dead Time Provides Control Over

Total Range

GND

C1

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_CC– 2 V. 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

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.

AVAILABLE OPTIONS

PACKAGED DEVICES⁽¹⁾

SHRINK SMALL

OUTLINE

(DB)

THIN SHRINK

SMALL OUTLINE

(PW)

T_A

SMALL OUTLINE

(D)

PLASTIC DIP

(N)

SMALL OUTLINE

(NS)

0°C to 70°C

TL494CD

TL494ID

TL494CN

TL494IN

TL494CNS

—

TL494CDB

—

TL494CPW

—

–40°C to 85°C

(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.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

FUNCTION TABLE

INPUT TO

OUTPUT CTRL

OUTPUT FUNCTION

V_I= GND

V_I= V_ref

Single-ended or parallel output

Normal push-pull operation

FUNCTIONAL BLOCK DIAGRAM

OUTPUT CTRL

(see Function Table)

13

6

5

RT

CT

Oscillator

Q1

8

9

1D

C1

E1

Dead-Time Control

Comparator

≈ 0.1 V

4

DTC

C1

≈ 0.7 V

Q2

11

10

PWM

Comparator

C2

E2

Error Amplifier 1

1

2

1IN+

1IN−

+

−

Pulse-Steering

Flip-Flop

Error Amplifier 2

12

14

V

CC

16

15

2IN+

2IN−

+

−

Reference

Regulator

REF

7

GND

3

0.7 mA

FEEDBACK

2

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

Absolute Maximum Ratings⁽¹⁾

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

MIN

MAX

41

UNIT

V

V_CC

V_I

Supply voltage⁽²⁾

Amplifier input voltage

Collector output voltage

Collector output current

V_CC+ 0.3

41

V

V_O

I_O

V

250

73

mA

D package

DB package

N package

NS package

PW package

82

θ_JA

Package thermal impedance⁽³⁾⁽⁴⁾

67

°C/W

64

108

260

150

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

Storage temperature range

°C

T_stg

–65

(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), θ_JA, and T_A. The maximum allowable power dissipation at any allowable ambient

temperatire is P_D= (T_J(max) – T_A)/θ_JA. Operating at the absolute maximum T_Jof 150°C can affect reliability.

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

Recommended Operating Conditions

MIN

7

MAX

40

UNIT

V

V_CC

V_I

Supply voltage

Amplifier input voltage

Collector output voltage

Collector output current (each transistor)

Current into feedback terminal

Oscillator frequency

–0.3

V_CC– 2

40

V

V_O

V

200

mA

kHz

nF

kΩ

0.3

f_OSC

C_T

1

0.47

1.8

0

300

Timing capacitor

10000

500

R_T

Timing resistor

TL494C

TL494I

70

T_A

Operating free-air temperature

°C

–40

85

3

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

Electrical Characteristics

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

Reference Section

TL494C, TL494I

PARAMETER

TEST CONDITIONS⁽¹⁾

I_O= 1 mA

UNIT

MIN TYP⁽²⁾

MAX

5.25

25

Output voltage (REF)

Input regulation

4.75

5

2

V

mV

V_CC= 7 V to 40 V

I_O= 1 mA to 10 mA

∆T_A= MIN to MAX

REF = 0 V

Output regulation

1

15

mV

Output voltage change with temperature

Short-circuit output current⁽³⁾

2

10

mV/V

mA

25

(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.

Oscillator Section

C_T= 0.01 µF, R_T= 12 kΩ (see Figure 1)

TL494C, TL494I

PARAMETER

TEST CONDITIONS⁽¹⁾

UNIT

MIN TYP⁽²⁾

MAX

Frequency

Standard deviation of frequency⁽³⁾

10

100

1

kHz

All values of V_CC, C_T, R_T, and T_Aconstant

V_CC= 7 V to 40 V, T_A= 25°C

∆T_A= MIN to MAX

Hz/kHz

Frequency change with voltage

Frequency change with temperature⁽⁴⁾

10

(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:

N

2

ȍ

(x_n* X)

Ǹ

n+1

s +

N * 1

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

Error-Amplifier Section

See Figure 2

TL494C, TL494I

MIN TYP⁽¹⁾

PARAMETER

Input offset voltage

TEST CONDITIONS

V_O(FEEDBACK) = 2.5 V

UNIT

MAX

10

2

25

mV

nA

µA

Input offset current

Input bias current

V_O(FEEDBACK) = 2.5 V

250

1

0.2

–0.3 to

V_CC– 2

Common-mode input voltage range

V_CC= 7 V to 40 V

V

Open-loop voltage amplification

Unity-gain bandwidth

∆V_O= 3 V, V_O= 0.5 V to 3.5 V, R_L= 2 kΩ

V_O= 0.5 V to 3.5 V, R_L= 2 kΩ

70

95

800

80

dB

kHz

dB

Common-mode rejection ratio

Output sink current (FEEDBACK)

Output source current (FEEDBACK)

∆V_O= 40 V, T_A= 25°C

65

0.3

–2

V_ID= –15 mV to –5 V, V (FEEDBACK) = 0.7 V

V_ID= 15 mV to 5 V, V (FEEDBACK) = 3.5 V

0.7

mA

(1) All typical values, except for parameter changes with temperature, are at T_A= 25°C.

4

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

Electrical Characteristics

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

Output Section

PARAMETER

Collector off-state current

TEST CONDITIONS

V_CE= 40 V, V_CC= 40 V

V_CC= V_C= 40 V, V_E= 0

V_E= 0, I_C= 200 mA

MIN

TYP⁽¹⁾

MAX

100

–100

1.3

UNIT

µA

2

Emitter off-state current

µA

Common emitter

Emitter follower

1.1

1.5

Collector-emitter saturation voltage

Output control input current

V

V_{O(C1 or C2)}= 15 V, I_E= –200 mA

V_I= V_ref

2.5

3.5

mA

(1) All typical values, except for temperature coefficient, are at T_A= 25°C.

Dead-Time Control Section

See Figure 1

PARAMETER

TEST CONDITIONS

MIN TYP⁽¹⁾

MAX

UNIT

Input bias current (DEAD-TIME CTRL)

V_I= 0 to 5.25 V

–2

–10

µA

V_I(DEAD-TIME CTRL) = 0, C_T= 0.01 µF,

R_T= 12 kΩ

Maximum duty cycle, each output

45

%

V

Zero duty cycle

3

3.3

Input threshold voltage (DEAD-TIME CTRL)

Maximum duty cycle

0

(1) All typical values, except for temperature coefficient, are at T_A= 25°C.

PWM Comparator Section

See Figure 1

PARAMETER

Input threshold voltage (FEEDBACK)

Input sink current (FEEDBACK)

TEST CONDITIONS

MIN TYP⁽¹⁾

MAX

UNIT

V

Zero duty cyle

4

4.5

V (FEEDBACK) = 0.7 V

0.3

0.7

mA

(1) All typical values, except for temperature coefficient, are at T_A= 25°C.

Total Device

PARAMETER

Standby supply current

Average supply current

TEST CONDITIONS

MIN TYP⁽¹⁾

MAX

10

UNIT

mA

V_CC= 15 V

V_CC= 40 V

6

9

R_T= V_ref

,

All other inputs and outputs open

15

V_I(DEAD-TIME CTRL) = 2 V, See Figure 1

7.5

mA

(1) All typical values, except for temperature coefficient, are at T_A= 25°C.

Switching Characteristics

T_A= 25°C

PARAMETER

TEST CONDITIONS

MIN TYP⁽¹⁾

MAX

200

100

200

100

UNIT

ns

Rise time

Fall time

Rise time

Fall time

100

25

Common-emitter configuration, See Figure 3

ns

100

40

ns

Emitter-follower configuration, See Figure 4

ns

(1) All typical values, except for temperature coefficient, are at T_A= 25°C.

5

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

PARAMETER MEASUREMENT INFORMATION

V

CC

= 15 V

150 Ω

12

2 W

V

CC

4

3

8

9

Output 1

C1

E1

DTC

Test

Inputs

FEEDBACK

12 kΩ

6

5

11

10

C2

E2

Output 2

RT

CT

0.01 µF

1

1IN+

2

1IN−

Error

Amplifiers

16

15

2IN+

2IN−

13

14

OUTPUT

CTRL

REF

GND

7

50 kΩ

TEST CIRCUIT

V

CC

Voltage

at C1

0 V

V

CC

Voltage

at C2

0 V

Voltage

at CT

Threshold Voltage

DTC

0 V

Threshold Voltage

MAX

FEEDBACK

0.7 V

0%

Duty Cycle

0%

VOLTAGE WAVEFORMS

Figure 1. Operational Test Circuit and Waveforms

6

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

PARAMETER MEASUREMENT INFORMATION

Amplifier Under Test

FEEDBACK

+

−

V

I

+

−

V

ref

Other Amplifier

Figure 2. Amplifier Characteristics

15 V

68 Ω

t

f

2 W

t

r

Each Output

Circuit

Output

90%

C

L

= 15 pF

(See Note A)

10%

TEST CIRCUIT

NOTE A: C includes probe and jig capacitance.

OUTPUT VOLTAGE WAVEFORM

L

Figure 3. Common-Emitter Configuration

15 V

Each Output

Circuit

Output

90%

68 Ω

2 W

C

L

= 15 pF

10%

(See Note A)

t

f

t

r

TEST CIRCUIT

NOTE A: C includes probe and jig capacitance.

OUTPUT VOLTAGE WAVEFORM

L

Figure 4. Emitter-Follower Configuration

7

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

www.ti.com

SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005

TYPICAL CHARACTERISTICS

OSCILLATOR FREQUENCY AND

†

FREQUENCY VARIATION

vs

TIMING RESISTANCE

100 k

40 k

V

T

= 15 V

= 25°C

CC

A

−2%

0.001 µF

−1%

10 k

4 k

0.01 µF

0%

0.1 µF

1 k

400

†

Df = 1%

100

40

C

T

= 1 µF

10

1 k

4 k

10 k

40 k 100 k

400 k 1 M

R

T

− Timing Resistance − Ω

†

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

Figure 5.

AMPLIFIER VOLTAGE AMPLIFICATION

vs

FREQUENCY

100

V

= 15 V

CC

90

80

70

60

50

40

30

20

10

0

∆V = 3 V

T

A

O

= 25°C

1

10

100

1 k

10 k

1 M

100 k

f − Frequency − Hz

Figure 6.

8

PACKAGE OPTION ADDENDUM

www.ti.com

17-Oct-2005

PACKAGING INFORMATION

Orderable Device

TL494CD

Status ⁽¹⁾

ACTIVE

Package Package

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

Qty

Type

Drawing

SOIC

D

16

40 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TL494CDBR

TL494CDBRE4

TL494CDE4

TL494CDR

SSOP

SOIC

DB

D

2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

40 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

D

2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TL494CDRE4

D

2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TL494CJ

TL494CN

OBSOLETE

ACTIVE

CDIP

PDIP

J

16

TBD

Call TI

N

25

Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

TL494CNE4

TL494CNSR

TL494CNSRG4

TL494CPW

ACTIVE

PDIP

SO

N

16

Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

NS

PW

2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

SO

2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TSSOP

90 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TL494CPWG4

90 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TL494CPWLE

TL494CPWR

OBSOLETE TSSOP

PW

16

TBD

Call TI

ACTIVE

TSSOP

SOIC

PDIP

2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TL494CPWRG4

TL494ID

PW

D

16

2000 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

40 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TL494IDE4

TL494IDR

D

40 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

D

2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

TL494IDRE4

TL494IN

D

2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM

no Sb/Br)

N

25

Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

TL494INE4

PDIP

N

25

Pb-Free

(RoHS)

CU NIPDAU Level-NC-NC-NC

TL494MJ

OBSOLETE

CDIP

J

16

TBD

Call TI

TL494MJB

⁽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.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

17-Oct-2005

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.

Addendum-Page 2

MECHANICAL DATA

MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001

DB (R-PDSO-G**)

PLASTIC SMALL-OUTLINE

28 PINS SHOWN

0,38

0,22

0,65

28

M

0,15

15

0,25

0,09

5,60

5,00

8,20

7,40

Gage Plane

1

14

0,25

A

0°–ā8°

0,95

0,55

Seating Plane

0,10

2,00 MAX

0,05 MIN

PINS **

14

16

20

24

28

30

38

DIM

6,50

5,90

6,50

5,90

7,50

8,50

7,90

10,50

9,90

10,50 12,90

A MAX

A MIN

6,90

9,90

12,30

4040065 /E 12/01

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

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

0,30

0,19

M

0,10

0,65

14

8

0,15 NOM

4,50

4,30

6,60

6,20

Gage Plane

0,25

1

7

0°–8°

A

0,75

0,50

Seating Plane

0,10

0,15

0,05

1,20 MAX

PINS **

8

14

16

20

24

28

DIM

3,10

2,90

5,10

4,90

5,10

4,90

6,60

6,40

7,90

9,80

9,60

A MAX

A MIN

7,70

4040064/F 01/97

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

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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Post Office Box 655303 Dallas, Texas 75265

型号:	TL494G-P16-R
是否Rohs认证：	符合
生命周期：	Active
IHS 制造商：	UNISONIC TECHNOLOGIES CO LTD
包装说明：	TSSOP-16
Reach Compliance Code：	compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
风险等级：	5.64
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER
控制模式：	VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION
最大输入电压：	40 V
最小输入电压：	7 V
标称输入电压：	15 V
JESD-30 代码：	R-PDSO-G16
功能数量：	1
端子数量：	16
最高工作温度：	70 °C
最低工作温度：
最大输出电流：	0.25 A
封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE
表面贴装：	YES
温度等级：	COMMERCIAL
端子形式：	GULL WING
端子位置：	DUAL
Base Number Matches：	1

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