TEXAS INSTRUMENTS TL1451A Technical data

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TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

D

Complete PWM Power Control Circuitry

D

Completely Synchronized Operation

D

Internal Undervoltage Lockout Protection

D

Wide Supply Voltage Range

D

Internal Short-Circuit Protection

D

Oscillator Frequency . . . 500 kHz Max

D

Variable Dead Time Provides Control Over
Total Range

D

Internal Regulator Provides a Stable 2.5-V
Reference Supply

D

Available in Q-Temp Automotive

HighRel Automotive Applications
Configuration Control / Print Support
Qualification to Automotive Standards

description

The TL1451A incorporates on a single monolithic
chip all the functions required in the construction
of two pulse-width-modulation (PWM) control
circuits. Designed primarily for power-supply
control, the TL1451A contains an on-chip 2.5-V
regulator, two error amplifiers, an adjustable
oscillator, two dead-time comparators, undervol­tage lockout circuitry, and dual common-emitter
output transistor circuits.

ERROR 1IN+

AMPLIFIER 1 1IN–

1FEEDBACK

D, DB, N, NS, PW, OR J PACKAGE

1FEEDBACK

1DTC
1OUT

1IN+
1IN–

NC

IDTC

CT
RT

GND

RTCTNC

4
5
6
7
8

1OUT

(TOP VIEW)

16

1

15

2

14

3

13

4

12

5

11

6

10

7
8

FK PACKAGE

(TOP VIEW)

9

REF

NC

GND

V

REF
SCP
2IN+ ERROR
2IN– AMPLIFIER 2
2FEEDBACK
2DTC
2OUT
V

CC

SCP

1920132

2IN+

18

2IN–

17

NC

16

2FEEDBACK

15

2DTC

14

1312119 10

CC

OUT

The uncommitted output transistors provide
common-emitter output capability for each
controller. The internal amplifiers exhibit a common-mode voltage range from 1.04 V to 1.45 V. The dead-time
control (DTC) comparator has no offset unless externally altered and can provide 0% to 100% dead time. The
on-chip oscillator can be operated by terminating RT and CT. During low V

conditions, the undervoltage

CC

lockout control circuit feature locks the outputs off until the internal circuitry is operational.
The TL1451AC is characterized for operation from –20°C to 85°C. The TL1451AQ is characterized for operation

from –40°C to 125°C. The TL1451AM is characterized for operation from –55°C to 125°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

T

A

–20°C to 85°C — TL1451ACDB TL1451ACN TL1451ACNS TL1451ACPW — —
–40°C to 125°C TL1451AQD — — — — — —
–55°C to 125°C — — — — — TL1451AMFK TL1451AMJ

†

The DB and PW packages are only available left-end taped and reeled (add LE suffix, i.e., TL1451ACPWLE).

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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

SMALL

OUTLINE

(D)

SMALL

OUTLINE

(DB)

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

†

PLASTIC DIP

(N)

SMALL

OUTLINE

(NS)

TSSOP

†

(PW)

Copyright  1999, Texas Instruments Incorporated

On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.

CHIP

CARRIER

(FK)

CERAMIC

DIP

(J)

1

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

functional block diagram

VCCRT CT

2 DTC

11

92 1

ERROR

AMPLIFIER 2

2 FEEDBACK

1 FEEDBACK

ERROR

AMPLIFIER 1

IN+
IN–

SCP

IN+
IN–

1 DTC

14
13
12

5

15

3
4

6

+
–

PWM
COMP

PWM
COMP

R
S

Oscillator

R

1/2 V

ref

Reference

12 kΩ

170 kΩ UVLO

+
–

Resistors 65
Capacitors 8
Transistors 105
JFETs 18

Voltage

COMPONENT COUNT

10

2 OUTPUT

16

REF

7

1 OUTPUT

8

GND

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

absolute maximum ratings over operating free-air temperature range

†

Supply voltage, VCC 51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Amplifier input voltage, VI 20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Collector output voltage, VO 51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Collector output current, I

21 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

Continuous power total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, TA C suffix –20°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Q suffix –40°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

M suffix –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

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.

DISSIPATION RATING TABLE

PACKAGE

D 1088 mW 8.7 mW/°C 696 mW 566 mW 218 mW

DB 775 mW 6.2 mW/°C 496 mW 403 mW —

N 1000 mW 8.0 mW/°C 640 mW 520 mW —

NS 500 mW 4.0 mW/°C 320 mW 260 mW —

PW 838 mW 6.7 mW/°C 536 mW 436 mW 168 mW

FK 1375 mW 11.0 mW/°C 880 mW 715 mW 275 mW

J 1375 mW 1 1.0 mW/°C 880 mW 715 mW 275 mW

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

TA = 125°C

POWER RATING

recommended operating conditions

MIN MAX UNIT

Supply voltage, V
Amplifier input voltage, V
Collector output voltage, V
Collector output current, I
Current into feedback terminal 45 µA
Feedback resistor, R
Timing capacitor , C
Timing resistor , R
Oscillator frequency 1 500 kHz

Operating free-air temperature, T

CC

T

I

O

O

F

T

C suffix –20 85

A

Q suffix –40 125
M suffix –55 125

3.6 50 V

1.05 1.45 V
50 V
20 mA

100 kΩ
150 15000 pF

5.1 100 kΩ

°C

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

Output voltage change with temperature

PARAMETER

TEST CONDITIONS

UNIT

I

T

25°C

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

Frequency change with temperature

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)

reference section

TL1451AC

MIN

Output voltage (pin 16) IO = 1 mA 2.4 2.5 2.6 V

p

Input voltage regulation VCC = 3.6 V to 40 V 2 12.5 mV
Output voltage regulation IO = 0.1 mA to 1 mA 1 7.5 mV
Short-circuit output current VO = 0 3 10 30 mA

†

All typical values are at TA = 25°C.

p

TA = –20°C to 25°C –0.1% ±1%
TA = 25°C to 85°C –0.2% ±1%

undervoltage lockout section

MIN

Upper threshold voltage (VCC) 2.72 V
Lower threshold voltage (VCC)
Hysteresis (VCC)
Reset threshold voltage (VCC) 1.5 1.9 V

†

All typical values are at TA = 25°C.

O(ref)

= 0.1 mA,

°

=

A

80 120 mV

†

TYP

TL1451AC

†

TYP

2.6 V

MAX

MAX

short-circuit protection control section

TL1451AC

MIN TYP†MAX

Input threshold voltage (SCP) TA = 25°C 0.65 0.7 0.75 V
Standby voltage (SCP) No pullup 140 185 230 mV
Latched input voltage (SCP) No pullup 60 120 mV
Input (source) current VI = 0.7 V, TA = 25°C –10 –15 –20 µA
Comparator threshold voltage (FEEDBACK) 1.18 V

†

All typical values are at TA = 25°C.

oscillator section

TL1451C

MIN TYP†MAX

Frequency CT = 330 pF, RT = 10 kΩ 200 kHz
Standard deviation of frequency CT = 330 pF, RT = 10 kΩ 10%
Frequency change with voltage VCC = 3.6 V to 40 V 1%

p

†

All typical values are at TA = 25°C.

TA = –20°C to 25°C –0.4% ±2%
TA = 25°C to 85°C –0.2% ±2%

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

Input threshold voltage at f

(DTC)

V

PARAMETER

TEST CONDITIONS

UNIT

1.05

gg

CC

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

Input threshold voltage at f

(FEEDBACK)

V

PARAMETER

TEST CONDITIONS

UNIT

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

dead-time control section

TL1451AC

MIN TYP†MAX

Input bias current (DTC) 1 µA
Latch mode (source) current (DTC) TA = 25°C –80 –145 µA
Latched input voltage (DTC) IO = 40 µA 2.3 V

p

†

All typical values are at TA = 25°C.

= 10 kHz

error-amplifier section

Input offset voltage VO (FEEDBACK) = 1.25 V ±6 mV
Input offset current VO (FEEDBACK) = 1.25 V ±100 nA
Input bias current VO (FEEDBACK) = 1.25 V 160 500 nA

Common-mode input voltage range VCC = 3.6 V to 40 V

Open-loop voltage amplification RF = 200 kΩ 70 80 dB
Unity-gain bandwidth 1.5 MHz
Common-mode rejection ratio 60 80 dB
Positive output voltage swing V
Negative output voltage swing 1 V
Output (sink) current (FEEDBACK) VID = –0.1 V, VO = 1.25 V 0.5 1.6 mA
Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V –45 –70 µA

†

All typical values are at TA = 25°C.

Zero duty cycle 2.05 2.25
Maximum duty cycle 1.2 1.45

TL1451AC

MIN TYP†MAX

1.05
to

1.45

–0.1 V

ref

V

output section

TL1451AC

MIN TYP†MAX

Collector off-state current VO = 50 V 10 µA
Output saturation voltage IO = 10 mA 1.2 2 V
Short-circuit output current VO = 6 V 90 mA

†

All typical values are at TA = 25°C.

pwm comparator section

TL1451AC

MIN TYP†MAX

p

†

All typical values are at TA = 25°C.

= 10 kHz

Zero duty cycle 2.05 2.25
Maximum duty cycle 1.2 1.45

total device

TL1451AC

MIN TYP†MAX

Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 kΩ 1.7 2.4 mA

†

All typical values are at TA = 25°C.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

Output voltage (pin 16)

I

mA

V

PARAMETER

TEST CONDITIONS

UNIT

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)

reference section

TL1451AQ, TL1451AM

MIN

p

Output voltage change with temperature –0.63% *±4%

Input voltage regulation VCC = 3.6 V to 40 V

Output voltage regulation IO = 0.1 mA to 1 mA

Short-circuit output current VO = 0 3 10 30 mA

*These parameters are not production tested.
†

All typical values are at TA = 25°C unless otherwise indicated.

p

O

= 1

TA = 25°C 2.40 2.50 2.60
TA = MIN and 125°C 2.35 2.46 2.65

TA = 25°C 2.0 12.5
TA = 125°C 0.7 15
TA = MIN 0.3 30
TA = 25°C 1.0 7.5
TA = 125°C 0.3 14
TA = MIN 0.3 20

TYP

†

MAX

mV

mV

undervoltage lockout section

Upper threshold voltage (VCC)

Lower threshold voltage (VCC)

Hysteresis (VCC)

Reset threshold voltage (VCC)

†

All typical values are at TA = 25°C unless otherwise indicated.

TL1451AQ, TL1451AM

MIN

TYP

TA = 25°C 2.72
TA = 125°C 1.70
TA = MIN 3.15
TA = 25°C 2.60
TA = 125°C 1.65
TA = MIN 3.09
TA = 25°C 80 120
TA = 125°C 10 50
TA = MIN 10 60
TA = 25°C 1.50
TA = 125°C 0.95
TA = MIN 1.50

†

MAX

V

V

mV

V

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

R

T

kΩ

PARAMETER

TEST CONDITIONS

UNIT

Input bias current (DTC)

A

Input threshold voltage at f

(DTC)

V

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

short-circuit protection control section

TL1451AQ, TL1451AM

MIN TYP†MAX

TA = 25°C 650 700 750

Input threshold voltage (SCP)

Standby voltage (SCP) 140 185 230 mV

Latched input voltage (SCP)

Equivalent timing resistance 170 kΩ
Comparator threshold voltage (FEEDBACK) 1.18 V

†

All typical values are at TA = 25°C unless otherwise indicated.

oscillator section

Frequency

Standard deviation of frequency CT = 330 pF, RT = 10 kΩ 2%

Frequency change with voltage VCC = 3.6 V to 40 V

Frequency change with temperature 1.37% *±10%

*These parameters are not production tested.
†

All typical values are at TA = 25°C unless otherwise indicated.

CT = 330 pF,

TA = 125°C 400 478 550
TA = MIN 800 880 950

TA = 25°C 60 120
TA = 125°C 70 120
TA = MIN 60 120

TL1451AQ, TL1451AM

MIN TYP†MAX

TA = 25°C 200

= 10

TA = 125°C 195
TA = MIN 193

TA = 25°C 1%
TA = 125°C 1%
TA = MIN 3%

mV

mV

kHz

dead-time control section

TL1451AQ, TL1451AM

MIN TYP†MAX

p

Latch mode (source) current (DTC) –80 –145 µA

Latched input voltage (DTC)

p

*These parameters are not production tested.
†

All typical values are at TA = 25°C unless otherwise indicated.

= 10 kHz

TA = 25°C 1
TA = MIN and 125°C 3

TA = 25°C 2.30
TA = 125°C 2.22 2.32
TA = MIN 2.28 2.40
Zero duty cycle 2.05 *2.25
Maximum duty cycle *1.20 1.45

µ

V

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

7

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

1.05

gg

CC

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

Input threshold voltage at f

(FEEDBACK)

V

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

error-amplifier section

TL1451AQ, TL1451AM

MIN TYP†MAX

TA = 25°C ±6

Input offset voltage VO (FEEDBACK) = 1.25 V

Input offset current VO (FEEDBACK) = 1.25 V

Input bias current VO (FEEDBACK) = 1.25 V

Common-mode input voltage range VCC = 3.6 V to 40 V

Open-loop voltage amplification RF = 200 kΩ

Unity-gain bandwidth 1.5 MHz
Common-mode rejection ratio 60 80 dB
Positive output voltage swing 2 V
Negative output voltage swing 1 V

Output (sink) current (FEEDBACK) VID = –0.1 V, VO = 1.25 V

Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V

†

All typical values are at TA = 25°C unless otherwise indicated.

TA = 125°C ±10
TA = MIN ±12
TA = 25°C ±100
TA = 125°C ±100
TA = MIN ±200
TA = 25°C 160 500
TA = 125°C 100 500
TA = MIN 142 700

1.05
to

1.45

TA = 25°C 70 80
TA = 125°C 70 80
TA = MIN 64 80

TA = 25°C 0.5 1.6
TA = 125°C 0.4 1.8
TA = MIN 0.3 1.7
TA = 25°C –45 –70
TA = 125°C –25 –50
TA = MIN –15 –70

mV

nA

nA

V

dB

mA

µA

output section

TL1451AQ, TL1451AM

MIN TYP†MAX

Collector off-state current VO = 50 V 10 µA

TA = 25°C 1.20 2.0

Output saturation voltage

Short-circuit output current VO = 6 V 90 mA

†

All typical values are at TA = 25°C unless otherwise indicated.

TA = 125°C 1.60 2.4
TA = MIN

1.36 2.2

pwm comparator section

TL1451AQ, TL1451AM

MIN TYP†MAX

p

*These parameters are not production tested.
†

All typical values are at TA = 25°C unless otherwise indicated.

= 10 kHz

Zero duty cycle 2.05 *2.25
Maximum duty cycle *1.20 1.45

V

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

PARAMETER

TEST CONDITIONS

UNIT

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

total device

TL1451AQ, TL1451AM

MIN TYP†MAX

Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 kΩ 1.7 2.4 mA

†

All typical values are at TA = 25°C unless otherwise indicated.

PARAMETER MEASUREMENT INFORMATION

S1

C

PE

C

330 pF

0.47 µF

T

Figure 1. Test Circuit

Oscillator Triangle Waveform

Error Amplifier Output

Dead-Time Input Voltage

Short-Circuit Protection

Comparator Input Voltage

PWM Comparator Output Voltage

Output Transistor Collector

Protection Enable

Terminal Waveform

Short-Circuit Protection

Comparator Output

Power Supply Voltage

†

Protection Enable Time, tpe = (0.051 x 106 x Cpe) in seconds

Waveform

2.8 V TYP

TL1451A

R

T

10 kΩ

Test

Input

Test

Input

VCC = 5 V

910111213141516

87654321

R

L

4.7 kΩ

R

L

4.7 kΩ

OUT1

OUT2

Dead Time 100%

†

t

pe

2.0 V

1.6 V

1.4 V

1.25 V
H

L

H
L

0.6 V
0 V

H
L

3.6 V
0 V

Figure 2. TL1451A Timing Diagram

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

9

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

TRIANGLE OSCILLATOR FREQUENCY

vs

TIMING RESISTANCE

1 M

VCC = 5 V
TA = 25°C

CT = 150 pF

100 k

CT = 1500 pF

10 k

osc

fosc – Triangle Oscillator Frequency – Hz

f

1 k

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

RT – Timing Resistance – Ω

CT = 15000 pF

Figure 3 Figure 4

OSCILLATOR FREQUENCY VARIATION

FREE-AIR TEMPERATURE

3

VCC = 3.6 V
RT = 10 kΩ
CT = 330 pF

2

f

= 200 kHz

osc

1

0

–1

–2

osc

f

afosc – Oscillator Frequency Variation – %

∆

–3

–25 0 25 50

TA – Free-Air Temperature – °C

vs

75 100

2.6

2.4

2.2

2

1.8

1.6

1.4

1.2

Triangle W aveform Swing Voltage – V

1

0.8
10

TRIANGLE WAVEFORM SWING VOLTAGE

vs

TIMING CAPACITANCE

VCC = 5 V
RT = 5.1 kΩ
TA = 25°C

1

2

10

CT – Timing Capacitance – pF

10

3

10

4

Figure 5 Figure 6

10

TRIANGLE WAVEFORM PERIOD

vs

TIMING CAPACITANCE

2

10

VCC = 5 V
RT = 5.1 kΩ

10

10

10

1

0

–1

10

TA = 25°C

1

2

10

CT – Timing Capacitance – pF

10

3

10

4

10

5

sµ

Triangle W aveform Period – uS

5

10

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

ОООООО

ОООООО

ОООООО

ОООООО

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

REFERENCE OUTPUT VOLTAGE VARIATION

vs

FREE-AIR TEMPERATURE

30

VCC = 3.6 V
I

= 1 mA

I(ref)

20

10

0

–10

– 20

avref – Reference Output Voltage Variation – mV

O(ref)

V

∆

– 30

– 25 0 25 50

TA – Free-Air Temperature – °C

Figure 7 Figure 8

75 100

REFERENCE OUTPUT VOLTAGE VARIATION

vs

FREE-AIR TEMPERATURE

30

VCC = 40 V
I

= 1 mA

I(ref)

20

10

0

–10

– 20

avref – Reference Output Voltage Variation – mV

O(ref)

V

– 30

∆

– 25 0 25 50

TA – Free-Air Temperature – °C

75 100

REFERENCE OUTPUT VOLTAGE

SUPPLY VOLTAGE

3

TA = 25°C

2.5

2

1.5

1

Vref – Reference Output Voltage – V

O(ref)

0.5

V

0

0 5 10 15 20 25

VCC – Supply Voltage – V

Figure 9 Figure 10

vs

30 35 40

DROPOUT VOLTAGE VARIATION

FREE-TEMPERATURE

1.1
I

= 1 mA

I(ref)

1

0.9

0.8

0.7

Dropout Voltage Variation – V

0.6

– 25 0 25 50

TA – Free-Air Temperature – °C

vs

75 100

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

11

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

UNDERVOLTAGE LOCKOUT

HYSTERESIS CHARACTERISTICS

6

TA = 85°C

5

4

3

2

CE

1

VCE – Output Collector Voltage – V

V

0

5 V

R

L

7,10

IO = 10 mA

0123

I = I

8

O

V

DE

VCC – Supply Voltage – V

TA = 25°C

TA = –20°C

45

UNDERVOLTAGE LOCKOUT CHARACTERISTIC

3.5

3.25

3

2.75

2.5
Hysteresis Voltage
(Right Scale)

2.25

2

Undervoltage Lockout Threshold Voltage – V

–25 0 25 50

Threshold V oltage –V
(Left Scale)

Threshold Voltage –V
(Left Scale)

TA – Free-Air Temperature – °C

TH

75 100

300

250

200

TL

150

100

50

0

Undervoltage Lockout Hystersis Voltage – mV

Figure 11 Figure 12

SHORT-CIRCUIT PROTECTION CHARACTERISTICS

1.30

1.25

1.20

1.15

Comparator Threshold Voltage – V

1.10

Short-Circuit Protection
Comparator Threshold Voltage
(Left Scale)

– 25 0 25

Short-Circuit Protection
Latch Reset Supply Voltage
(Right Scale)

50 75 100

TA – Free-Air Temperature – °C

3

2.5

2

1.5
RS – Latch Reset Supply Voltage – V

1

Figure 13

12

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

18

15

12

pe

t

tpe – Protection Enable Time – s

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

PROTECTION ENABLE TIME

vs

PROTECTION ENABLE CAPACITANCE

9

6

3

ERROR AMP 1
ERROR AMP 2

1.25 V

0

Short-circuit

Protection

Comparator

+

–

0 50 100 150

CPE – Protection Enable Capacitance – µF

SCP V

15

12 kΩ

ref

16

C

PE

Figure 14

200 250

170 kΩ

SR
Protection

Latch

V

ref

V

ref

U.V.L.O.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

13

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

ERROR AMP MAXIMUM OUTPUT VOLTAGE SWING

vs

FREQUENCY

2.25
VCC = 5 V

2

TA = 25°C

1.75

1.5

1.25

1

0.75

0.5

0.25

Error Amp Maximum Output Voltage Swing – V

0

1 k 10 k 100 k 1 M 10 M

f – Frequency – Hz

Figure 15 Figure 16

OPEN-LOOP VOLTAGE AMPLIFICATION

vs

FREQUENCY

90

80

70

60

50

40

30

20

Open-Loop Voltage Amplification – dB

10

0

100 1 k 10 k 100 k 1 M 2 M

f – Frequency – Hz

VCC = 5 V
TA = 25°C

UNITY-GAIN CONFIGURATION)

10

VCC = 5 V
TA = 25°C

5

0

–5

G – Gain – dB

–10

–15

–20

1 k 10 k 100 k

GAIN (AMPLIFIER IN

vs

FREQUENCY

1 M 10 M

f – Frequency – Hz

Figure 17

14

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

CLOSED-LOOP GAIN AND PHASE SHIFT

vs

FREQUENCY

70

VCC = 5 V
R

= 150 Ω

ref

60

C

= 470 pF

ref

TA = 25°C

50

Closed-Loop Gain

40

30

Closed-Loop Gain – dB

20

10

0

100 1 k 10 k 100 k 1 M

(Left Scale)

f – Frequency – Hz

CX:

Phase Shift
(Right Scale)

47 pF
470 pF
4700 pF

TL1451A

0°
–10°

–20°
–30°

Phase Shift

–40°
–50°

–60°
–70°
–80°

–90°

39 kΩ

39 kΩ

V

ref

C

x

Test Circuit

Figure 18

+
–

R

ref

C

ref

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

15

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

CLOSED-LOOP GAIN AND PHASE SHIFT

vs

FREQUENCY

70

VCC = 5 V
R

= 15 Ω

ref

60

C

= 470 pF

ref

TA = 25°C

50

40

30

Closed-Loop Gain – dB

20

10

0

100 1 k 10 k 100 k 1 M

Closed-Loop Gain
(Left Scale)

f – Frequency – Hz

Phase Shift
(Right Scale)

CX:

47 pF
470 pF
4700 pF

0°
–10°

–20°
–30°

–40°
–50°

–60°
–70°
–80°

–90°

Phase Shift

39 kΩ

39 kΩ

V

ref

C

x

Test Circuit

Figure 19

+
–

R

ref

C

ref

16

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

CLOSED-LOOP GAIN AND PHASE SHIFT

vs

FREQUENCY

70

VCC = 5 V
R

= 15 Ω

ref

60

C

= 470 pF

ref

TA = 25°C

50

Closed-Loop Gain

40

30

Closed-Loop Gain – dB

20

10

0

100 1 k 10 k 100 k 1 M

(Left Scale)

f – Frequency – Hz

Phase Shift
(Right Scale)

CX:

47 pF
470 pF
4700 pF

TL1451A

0°
–10°

–20°
–30°

Phase Shift

–40°
–50°

–60°
–70°
–80°

–90°

39 kΩ

39 kΩ

V

ref

C

x

Test Circuit

Figure 20

+
–

R

ref

C

ref

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

17

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

CLOSED-LOOP GAIN AND PHASE SHIFT

vs

FREQUENCY

70

VCC = 5 V
C

= 470 pF

ref

60

TA = 25°C

50

40

30

Closed-Loop Gain – dB

20

10

0

100 1 k 10 k 100 k 1 M

Closed-Loop Gain
(Left Scale)

f – Frequency – Hz

Phase Shift
(Right Scale)

0°
–10°

–20°
–30°

–40°
–50°

–60°
–70°
–80°

–90°

Phase Shift

39 kΩ

39 kΩ

V

ref

Test Circuit

Figure 21

+
–

C

ref

18

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

TYPICAL CHARACTERISTICS

OUTPUT SINK CURRENT

vs

COLLECTOR OUTPUT SATURATION VOLTAGE

120

TA = –20°C

110
100

90
80
70
60

50
40

Output Sink Current – mA

30
20

10

0

0510

Collector Output Saturation Voltage – V

TA = 25°C

TA = 85°C

VCC = 3.6 V

15 20

TL1451A

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

– Maximum Output Voltage Swing – VV

V

V

V

V

V

V

OM

V

O(ref)

O(ref)

O(ref)

O(ref)

O(ref)

O(ref)

O(ref)

MAXIMUM OUTPUT VOLTAGE SWING

vs

FREE-AIR TEMPERATURE

–0.01

–0.02

Maximum Output Voltage

–0.03

–0.04

–0.05

–0.06

–0.07

–25 0 25 50 75 100

Maximum Output
Voltage Swing (Right Scale)

TA – Free-Air Temperature – °C

Swing (Right Scale)

Figure 22

1

0.9

0.8

0.7

0.6

0.5

– Maximum Output Voltage Swing – VV

OM

V

ref

33 kΩ

+

vom – 1

= 1.25 V

–

100 kΩ

R

L

33 kΩ

V

VCC = 3.6 V
RL = 100 kΩ
V

OM+1

VOM –1 = 1.15 V (Right Scale)
VOM –1 = 1.35 V (Left Scale)

TEST CIRCUIT

Figure 23

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

19

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

TYPICAL CHARACTERISTICS

OUTPUT TRANSISTOR ON DUTY CYCLE

DEAD-TIME INPUT VOLTAGE

0

VCC = 3.6 V

10

RT = 10kΩ
CT = 330 pF

20

30

40
50

60

70
80

Output Transistor “On” Duty Cycle – %

90

100

0 0.5 1 1.5 2 2.5 3

Dead-Time Input Voltage – V

Figure 24 Figure 25

vs

3.5 4

STANDBY CURRENT

vs

SUPPLY VOLTAGE

TA = 25°C

2

1.75

1.5

1.25

1

0.75

0.5

CC

ICC (Standby) – Standby Current – mA

I

0.25
0

01020

VCC – Supply Voltage – V

30 40

STANDBY CURRENT

FREE-AIR TEMPERATURE

2

1.75

1.5

1.25

1

0.75

CC

I

ICC – Supply Current – mA

0.5

0.25
0

–25 0 25 50

Average Supply Current
VCC = 6 V, RT = 10 kΩ,
CT = 330 pF

Stand-By Current, VCC = 40 V, No Load

Stand-By Current, VCC = 3.6 V, No Load

TA – Free-Air Temperature – °C

Figure 26 Figure 27

vs

75 100

MAXIMUM CONTINUOUS POWER DISSIPATION

vs

FREE-AIR TEMPERATURE

1200

1100

1000

Maximum Continuous Power Dissipation – mW

16-Pin N Plastic Dip

900
800
700
600

16-Pin NS Plastic SO

500
400
300
200
100

0

–25 0 25 50

Thermal Resistance

TA – Free-Air Temperature

Thermal Resistance
125°C/W

250°C/W

75 100

20

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

APPLICATION INFORMATION

V

CC

220 kΩ

470 Ω

150 Ω

L1

0.47 µF

V

C5

50 kΩ

ref

33 kΩ

33 kΩ

33 kΩ

R5

R2

C1

500 pF

TL1451A

33 kΩ

R1

500
pF

910111213141516

87654321

470 Ω

470 Ω

33 kΩ

33 kΩ

330 pF

220 Ω

470 Ω

1 µF

L2

R6

R7

R3

R4

C2

C4

Step-Up
Output

Step-Down
Output

NOTE A: V alues for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application.

Figure 28. High-Speed Dual Switching Regulator

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

21

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

MECHANICAL DATA

D (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE

14 PINS SHOWN

0.050 (1,27)

14

1

0.069 (1,75) MAX

0.020 (0,51)

0.014 (0,35)
8

7

A

0.010 (0,25)

0.004 (0,10)

DIM

0.157 (4,00)

0.150 (3,81)

PINS **

0.010 (0,25)

0.244 (6,20)

0.228 (5,80)

8

M

Seating Plane

0.004 (0,10)

14

0.008 (0,20) NOM

0°–8°

16

Gage Plane

0.010 (0,25)

0.044 (1,12)

0.016 (0,40)

A MAX

A MIN

NOTES: A. All linear dimensions are in inches (millimeters).

22

B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15).
D. Falls within JEDEC MS-012

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

0.197

(5,00)

0.189

(4,80)

0.344

(8,75)

0.337

(8,55)

0.394

(10,00)

0.386

(9,80)

4040047/D 10/96

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

MECHANICAL DATA

DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE

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

0,15 NOM

Gage Plane

0°–8°

0,25

1,03
0,63

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

8

3,30

2,70

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 /C 10/95

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

23

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

MECHANICAL DATA

FK (S-CQCC-N**) LEADLESS CERAMIC CHIP CARRIER

28 TERMINALS SHOWN

A SQ

B SQ

20

22

23

24

25

19

21

12826 27

12

1314151618 17

0.020 (0,51)

0.010 (0,25)

MIN

0.342
(8,69)

0.442

0.640

0.740

0.938

1.141

A

0.358

(9,09)

0.458

(11,63)

0.660

(16,76)

0.761

(19,32)(18,78)

0.962

(24,43)

1.165

(29,59)

NO. OF

TERMINALS

**

11

10

9

8

7

6

5

432

20

28

44

52

68

84

0.020 (0,51)

0.010 (0,25)

(11,23)

(16,26)

(23,83)

(28,99)

MINMAX

0.307

(7,80)

0.406

(10,31)

0.495

(12,58)

0.495

(12,58)

0.850

(21,6)

1.047

(26,6)

0.080 (2,03)

0.064 (1,63)

B

MAX

0.358
(9,09)

0.458

(11,63)

0.560

(14,22)

0.560

(14,22)

0.858
(21,8)

1.063
(27,0)

0.055 (1,40)

0.045 (1,14)

0.028 (0,71)

0.022 (0,54)

0.050 (1,27)

NOTES: A. All linear dimensions are in inches (millimeters).

24

B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a metal lid.
D. The terminals are gold-plated.
E. Falls within JEDEC MS-004

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

0.045 (1,14)

0.035 (0,89)

0.045 (1,14)

0.035 (0,89)

4040140/C 11/95

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

MECHANICAL DATA

J (R-GDIP-T**) CERAMIC DUAL-IN-LINE

14 LEADS SHOWN

14

1

0.065 (1,65)

0.045 (1,14)

0.100 (2,54)

0.070 (1,78)

PINS **

DIM

A MAX

B

8

C

7

0.020 (0,51) MIN

0.200 (5,08) MAX
Seating Plane

A MIN

B MAX

B MIN

C MAX

C MIN

0.310

(7,87)

0.290

(7,37)

0.785

(19,94)

0.755

(19,18)

0.300A0.300

(7,62)

0.245

(6,22)

1614

0.310

(7,87)

0.290

(7,37)

0.785

(19,94)

0.755

(19,18)

(7,62)

0.245

(6,22)

20

0.310

(7,87)

0.290

(7,37)

0.975

(24,77)

0.930

(23,62)

0.300

(7,62)

0.245

(6,22)

0.023 (0,58)

0.015 (0,38)

0.100 (2,54)

NOTES: A. All linear dimensions are in inches (millimeters).

B. This drawing is subject to change without notice.
C. This package is hermetically sealed with a ceramic lid using glass frit.
D. Index point is provided on cap for terminal identification.
E. Falls within MIL STD 1835 GDIP1-T14, GDIP1-T16, and GDIP1-T20

0.130 (3,30) MIN

0°–15°

0.014 (0,36)

0.008 (0,20)

4040083/E 03/99

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

25

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

MECHANICAL DATA

N (R-PDIP-T**) PLASTIC DUAL-IN-LINE PACKAGE

16 PINS SHOWN

16

1

0.035 (0,89) MAX

PINS **

DIM

A

9

0.260 (6,60)

0.240 (6,10)

8

0.070 (1,78) MAX

0.020 (0,51) MIN

0.200 (5,08) MAX

A MAX

A MIN

Seating Plane

14

0.775

(19,69)

0.745

(18,92)

16

0.775

(19,69)

0.745

(18,92)

18

0.920

(23,37)

0.850

(21,59)

20

0.975

(24,77)

0.940

(23,88)

0.310 (7,87)

0.290 (7,37)

0.100 (2,54)

0.021 (0,53)

0.015 (0,38)

NOTES: A. All linear dimensions are in inches (millimeters).

B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-001 (20-pin package is shorter than MS-001).

0.010 (0,25)

M

0.125 (3,18) MIN

0°–15°

0.010 (0,25) NOM

14/18 PIN ONL Y

4040049/C 08/95

26

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

MECHANICAL DATA

NS (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE

14 PINS SHOWN

1,27

14

1

2,00 MAX

0,51
0,35

8

5,60
5,00

7

A

0,05 MIN

M

0,25

8,20
7,40

Seating Plane

0,10

0,15 NOM

Gage Plane

0°–10°

0,25

1,05
0,55

DIM

A MAX

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.

PINS **

A MIN

16

10,501410,50

9,90 9,90

20 24

15,3012,90

12,30 14,70

4040062/B 02/95

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

27

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

MECHANICAL DATA

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

14

0,10

6,60
6,20

0,10

M

0,15 NOM

Gage Plane

0,25

0°–8°

2016

24

28

0,75
0,50

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

28

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

IMPORTANT NOTICE

T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERST OOD TO
BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
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party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Copyright  1999, Texas Instruments Incorporated