Texas Instruments TL5001EVM-101, TL5001EVM-102, TL5001EVM-097, TL5001EVM-089, TL5001EVM-087 Datasheet

TL5001, TL5001A

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS084E – APRIL 1994 – REVISED OCT OBER 1999

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Complete PWM Power Control

D

3.6-V to 40-V Operation

D

Internal Undervoltage-Lockout Circuit

D

Internal Short-Circuit Protection

D

Oscillator Frequency . . . 20 kHz to 500 kHz

D

Variable Dead Time Provides Control Over
Total Range

D

±3% Tolerance on Reference Voltage
(TL5001A)

D

Available in Q-Temp Automotive

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

description

The TL5001 and TL5001A incorporate on a single
monolithic chip all the functions required for a
pulse-width-modulation (PWM) control circuit.
Designed primarily for power-supply control, the
TL5001/A contains an error amplifier, a regulator,
an oscillator, a PWM comparator with a
dead-time-control input, undervoltage lockout
(UVLO), short-circuit protection (SCP), and an open-collector output transistor. The TL5001A has a typical
reference voltage tolerance of ±3% compared to ±5% for the TL5001.

The error-amplifier common-mode voltage ranges from 0 V to 1.5 V . The noninverting input of the error amplifier
is connected to a 1-V reference. Dead-time control (DTC) can be set to provide 0% to 100% dead time by
connecting an external resistor between DTC and GND. The oscillator frequency is set by terminating RT with
an external resistor to GND. During low V

CC

conditions, the UVLO circuit turns the output off until VCC recovers

to its normal operating range.
The TL5001C and TL5001AC are characterized for operation from –20°C to 85°C. The TL5001I and TL5001AI

are characterized for operation from – 40°C to 85°C. The TL5001Q and TL5001AQ are characterized for
operation from –40°C to 125°C. The TL5001M and TL5001AM are characterized for operation from –55°C to
125°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

T

A

SMALL OUTLINE

(D)

PLASTIC DIP

(P)

CERAMIC DIP

(JG)

CHIP CARRIER

(FK)

°

°

TL5001CD TL5001CP — —

–

20°C to 85°C

TL5001ACD TL5001ACP — —

°

°

TL5001ID TL5001IP — —

–

40°C to 85°C

TL5001AID TL5001AIP — —

°

°

TL5001QD — — —

–

40°C to 125°C

TL5001AQD — — —

°

°

— — TL5001MJG TL5001MFK

–

55°C to 125°C

— — TL5001AMJG TL5001AMFK

The D package is available taped and reeled. Add the suffix R to the device type (e.g., TL5001CDR).

Copyright  1999, Texas Instruments Incorporated

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.

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.

1
2
3
4

8
7
6
5

OUT

V

CC

COMP

FB

GND
RT
DTC
SCP

D, JG OR P PACKAGE

(TOP VIEW)

1920132

17

18

16
15
14

1312119 10

5

4

6
7
8

NC
RT
NC
DTC
NC

NC

V

CC

NC

COMP

NC

NC

OUTNCGND

NC

FB

NC

SCP

NC

NC

FK PACKAGE

(TOP VIEW)

TL5001, TL5001A
PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS084E – APRIL 1994 – REVISED OCT OBER 1999

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

schematic for typical application

TL5001/A

FB

COMP

V

O

DTC

RT

V

I

+

SCP

V

CC

+

TPS1101

GND

8

7

6

5

2

1

3

4

V

O

functional block diagram

GND

8

OUT

SCP

COMP

FB

5

3

4

–

+

DTC

RT

67

Comparator 2

SCP

PWM/DTC
Comparator

OSC

Comparator 1

SCP

Amplifier

Error

UVLO

V

CC

2

1

1 V

1.5 V 1 V

Reference

Voltage

I

DT

2.5 V

TL5001, TL5001A

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS084E – APRIL 1994 – REVISED OCT OBER 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

detailed description

voltage reference

A 2.5-V regulator operating from VCC is used to power the internal circuitry of the TL5001 and TL5001A and
as a reference for the error amplifier and SCP circuits. A resistive divider provides a 1-V reference for the error
amplifier noninverting input which typically is within 2% of nominal over the operating temperature range.

error amplifier

The error amplifier compares a sample of the dc-to-dc converter output voltage to the 1-V reference and
generates an error signal for the PWM comparator. The dc-to-dc converter output voltage is set by selecting
the error-amplifier gain (see Figure 1), using the following expression:

VO = (1 + R1/R2) (1 V)

To PWM
Comparator

V

ref

= 1 V

4

V

I(FB)

3

+

–

R2

R1

COMP

FB

Compensation

Network

TL5001/A

GND

8

Figure 1. Error-Amplifier Gain Setting

The error-amplifier output is brought out as COMP for use in compensating the dc-to-dc converter control loop
for stability . Because the amplifier can only source 45 µA, the total dc load resistance should be 100 kΩ or more.

oscillator/PWM

The oscillator frequency (f

osc

) can be set between 20 kHz and 500 kHz by connecting a resistor between RT
and GND. Acceptable resistor values range from 15 kΩ to 250 kΩ. The oscillator frequency can be determined
by using the graph shown in Figure 5.

The oscillator output is a triangular wave with a minimum value of approximately 0.7 V and a maximum value
of approximately 1.3 V. The PWM comparator compares the error-amplifier output voltage and the DTC input
voltage to the triangular wave and turns the output transistor off whenever the triangular wave is greater than
the lesser of the two inputs.

dead-time control (DTC)

DTC provides a means of limiting the output-switch duty cycle to a value less than 100%, which is critical for
boost and flyback converters. A current source generates a reference current (IDT) at DTC that is nominally
equal to the current at the oscillator timing terminal, RT . Connecting a resistor between DTC and GND generates
a dead-time reference voltage (V

DT

), which the PWM/DTC comparator compares to the oscillator triangle wave
as described in the previous section. Nominally , the maximum duty cycle is 0% when VDT is 0.7 V or less and
100% when VDT is 1.3 V or greater. Because the triangle wave amplitude is a function of frequency and the
source impedance of RT is relatively high (1250 Ω), choosing RDT for a specific maximum duty cycle, D, is
accomplished using the following equation and the voltage limits for the frequency in question as found in
Figure 11 (V

osc

max and V

osc

min are the maximum and minimum oscillator levels):

TL5001, TL5001A
PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS084E – APRIL 1994 – REVISED OCT OBER 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

dead-time control (DTC) (continued)

RDT+ǒRt)

1250

Ǔ

ƪ

DǒV

osc

max – V

osc

minǓ)

V

osc

min

ƫ

Where

RDT and Rt are in ohms, D in decimal

Soft start can be implemented by paralleling the DTC resistor with a capacitor (CDT) as shown in Figure 2. During
soft start, the voltage at DTC is derived by the following equation:

VDT[

IDTR

DT

ǒ

1

–e

ǒ

–tńRDTC

DT

Ǔ

Ǔ

TL5001/A

DTC

C

DT

R

DT

6

Figure 2. Soft-Start Circuit

If the dc-to-dc converter must be in regulation within a specified period of time, the time constant, RDTCDT,
should be t0/3 to t0/5. The TL5001/A remains off until VDT ≈ 0.7 V, the minimum ramp value. CDT is discharged
every time UVLO or SCP becomes active.

undervoltage-lockout (UVLO) protection

The undervoltage-lockout circuit turns the output transistor off and resets the SCP latch whenever the supply
voltage drops too low (approximately 3 V at 25°C) for proper operation. A hysteresis voltage of 200 mV
eliminates false triggering on noise and chattering.

short-circuit protection (SCP)

The TL5001/A includes short-circuit protection (see Figure 3), which turns the power switch off to prevent
damage when the converter output is shorted. When activated, the SCP prevents the switch from being turned
on until the internal latching circuit is reset. The circuit is reset by reducing the input voltage until UVLO becomes
active or until the SCP terminal is pulled to ground externally.

When a short circuit occurs, the error-amplifier output at COMP rises to increase the power-switch duty cycle
in an attempt to maintain the output voltage. SCP comparator 1 starts an RC timing circuit when COMP exceeds

1.5 V . If the short is removed and the error-amplifier output drops below 1.5 V before time out, normal converter
operation continues. If the fault is still present at the end of the time-out period, the timer sets the latching circuit
and turns off the TL5001/A output transistor.

TL5001, TL5001A

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS084E – APRIL 1994 – REVISED OCT OBER 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

short-circuit protection (SCP) (continued)

Q1

12 kΩ

185 kΩ

R

SCP

Q2

SCP
Comparator 2

V

ref

= 1 V

SCP
Comparator 1

1.5 V

From Error

Amp

C

SCP

To Output
Drive Logic

SCP

5

2.5 V

Figure 3. SCP Circuit

The timer operates by charging an external capacitor (C

SCP

), connected between the SCP terminal and ground,

towards 2.5 V through a 185-kΩ resistor (R

SCP

). The circuit begins charging from an initial voltage of
approximately 185 mV and times out when the capacitor voltage reaches 1 V. The output of SCP comparator
2 then goes high, turns on Q2, and latches the timer circuit. The expression for setting the SCP time period is
derived from the following equation:

V

SCP

+(2.5*0.185

)

ǒ

1*e

–tńt

Ǔ

)

0.185

Where

τ = R

SCPCSCP

The end of the time-out period, t

SCP

, occurs when V

SCP

= 1 V. Solving for C

SCP

yields:

C

SCP

+

12.46 t

SCP

Where

t is in seconds, C in µF.

t

SCP

must be much longer (generally 10 to 15 times) than the converter start-up period or the converter will not

start.

output transistor

The output of the TL5001/A is an open-collector transistor with a maximum collector current rating of 21 mA and
a voltage rating of 51 V. The output is turned on under the following conditions: the oscillator triangle wave is
lower than both the DTC voltage and the error-amplifier output voltage, the UVLO circuit is inactive, and the
short-circuit protection circuit is inactive.

TL5001, TL5001A
PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS084E – APRIL 1994 – REVISED OCT OBER 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

†

Supply voltage, VCC (see Note 1) 41 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Amplifier input voltage, V

I(FB)

20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage, VO, OUT 51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output current, I

O

, OUT 21 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output peak current, I

O(peak)

, OUT 100 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Operating ambient temperature range, TA: TL5001C, TL5001AC –20°C to 85°C. . . . . . . . . . . . . . . . . . . . . .

TL5001I, TL5001AI –40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . .

TL5001Q, TL5001AQ –40°C to 125°C. . . . . . . . . . . . . . . . . . . . .

TL5001M, TL5001AM –55°C to 125°C. . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

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

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.

NOTE 1: All voltage values are with respect to network ground terminal.

DISSIPATION RATING TABLE

PACKAGE

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

D 725 mW 5.8 mW/°C 464 mW 377 mW 145 mW
FK 1375 mW 11.0 mW/°C 880 mW 715 mW 275 mW
JG 1050 mW 8.4 mW/°C 672 mW 546 mW 210 mW

P 1000 mW 8.0 mW/°C 640 mW 520 mW 200 mW

recommended operating conditions

MIN MAX UNIT

Supply voltage, V

CC

3.6 40 V

Amplifier input voltage, V

I(FB)

0 1.5 V
Output voltage, VO, OUT 50 V
Output current, IO, OUT 20 mA
COMP source current 45 µA
COMP dc load resistance 100 kΩ
Oscillator timing resistor, R

t

15 250 kΩ

Oscillator frequency, f

osc

20 500 kHz

TL5001C, TL5001AC –20 85

p

p

TL5001I, TL5001AI –40 85

°

Operating ambient temperature, T

A

TL5001Q, TL5001AQ –40 125

°C

TL5001M, TL5001AM –55 125

TL5001, TL5001A

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS084E – APRIL 1994 – REVISED OCT OBER 1999

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f

osc

= 100 kHz (unless otherwise noted)

reference

TL5001C, TL5001I TL5001AC, TL5001AI

PARAMETER

TEST CONDITIONS

MIN TYP†MAX MIN TYP†MAX

UNIT

Output voltage COMP connected to FB 0.95 1 1.05 0.97 1 1.03 V
Input regulation VCC = 3.6 V to 40 V 2 12.5 2 12.5 mV

TA = –20°C to 25°C (C suffix) –10 –1 10 –10 –1 10

Output voltage change with temperature

TA = –40°C to 25°C (I suffix) –10 –1 10 –10 –1 10

mV/V

TA = 25°C to 85°C –10 –2 10 –10 –2 10

†

All typical values are at TA = 25°C.

undervoltage lockout

TL5001C, TL5001I TL5001AC, TL5001AI

PARAMETER

TEST CONDITIONS

MIN TYP†MAX MIN TYP†MAX

UNIT

Upper threshold voltage TA = 25°C 3 3 V
Lower threshold voltage TA = 25°C 2.8 2.8 V
Hysteresis TA = 25°C 100 200 100 200 mV

Reset threshold voltage TA = 25°C 2.1 2.55 2.1 2.55 V

†

All typical values are at TA = 25°C.

short-circuit protection

TL5001C, TL5001I TL5001AC, TL5001AI

PARAMETER

TEST CONDITIONS

MIN TYP†MAX MIN TYP†MAX

UNIT

SCP threshold voltage TA = 25°C 0.95 1.00 1.05 0.97 1.00 1.03 V
SCP voltage, latched No pullup 140 185 230 140 185 230 mV
SCP voltage, UVLO standby No pullup 60 120 60 120 mV
Input source current TA = 25°C –10 –15 –20 –10 –15 –20 µA
SCP comparator 1 threshold voltage 1.5 1.5 V

†

All typical values are at TA = 25°C.

oscillator

TL5001C, TL5001I TL5001AC, TL5001AI

PARAMETER

TEST CONDITIONS

MIN TYP†MAX MIN TYP†MAX

UNIT

Frequency Rt = 100 kΩ 100 100 kHz
Standard deviation of frequency 15 15 kHz
Frequency change with voltage VCC = 3.6 V to 40 V 1 1 kHz

TA = –40°C to 25°C –4 –0.4 4 –4 –0.4 4 kHz

Frequency change with temperature

TA = –20°C to 25°C –4 –0.4 4 –4 –0.4 4 kHz
TA = 25°C to 85°C –4 –0.2 4 –4 –0.2 4 kHz

Voltage at RT 1 1 V

†

All typical values are at TA = 25°C.