TL1451A
DUAL PULSE WIDTH MODULATION CONTROL CIRCUITS
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
1
www.ti.com
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, undervol-
tage lockout circuitry, and dual common-emitter
output transistor circuits.
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
CC
conditions, the undervoltage
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
TA
SMALL
OUTLINE
(D)
SMALL
OUTLINE
(DB)
PLASTIC DIP
(N)
SMALL
OUTLINE
(NS)
TSSOP
(PW)
CHIP
CARRIER
(FK)
CERAMIC
DIP
(J)
20
C to 85
C
TL1451ACD
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).
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
5
6
7
8
16
15
14
13
12
11
10
9
CT
RT
ERROR 1IN+
AMPLIFIER 1 1IN
1FEEDBACK
1DTC
1OUT
GND
REF
SCP
2IN+ ERROR
2IN AMPLIFIER 2
2FEEDBACK
2DTC
2OUT
V
CC
D, DB, N, NS, PW, OR J PACKAGE
(TOP VIEW)
19
20
1
3
2
17
18
16
15
14
13
12
11
9
10
5
4
6
7
8
2IN+
2IN
NC
2FEEDBACK
2DTC
1IN+
1IN
NC
1FEEDBACK
IDTC
RT
CT
NC
REF
SCP
GND
NC
V
2
OUT
1OUT
FK PACKAGE
(TOP VIEW)
CC
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.
TL1451A
DUAL PULSE WIDTH MODULATION CONTROL CIRCUITS
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
2
www.ti.com
functional block diagram
+
+
Oscillator
Reference
Voltage
1/2 Vref
R
S
170 k
UVLO
R
9
2
1
VCC RT
CT
10
16
7
8
REF
GND
PWM
COMP
PWM
COMP
12 k
11
14
13
12
5
15
3
4
6
2 DTC
IN+
IN
2 FEEDBACK
1 FEEDBACK
SCP
IN+
IN
1 DTC
ERROR
AMPLIFIER 2
ERROR
AMPLIFIER 1
1 OUTPUT
2 OUTPUT
COMPONENT COUNT
Resistors
65
Capacitors
8
Transistors
105
JFETs
18
TL1451A
DUAL PULSE WIDTH MODULATION CONTROL CIRCUITS
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
3
www.ti.com
absolute maximum ratings over operating free-air temperature range
Supply voltage, V
CC
51 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier input voltage, V
I
20 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output voltage, V
O
51 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Collector output current, I
O
21 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power total dissipation
See Dissipation Rating Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
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
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.
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
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
11.0 mW/
C
880 mW
715 mW
275 mW
recommended operating conditions
MIN
MAX
UNIT
Supply voltage, VCC
3.6
50
V
Amplifier input voltage, VI
1.05
1.45
V
Collector output voltage, VO
50
V
Collector output current, IO
20
mA
Current into feedback terminal
45
A
Feedback resistor, RF
100
k
Timing capacitor, CT
150
15000
pF
Timing resistor, RT
5.1
100
k
Oscillator frequency
1
500
kHz
C suffix
20
85
Operating free-air temperature, TA
Q suffix
40
125
C
g
, A
M suffix
55
125
TL1451A
DUAL PULSE WIDTH MODULATION CONTROL CIRCUITS
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
4
www.ti.com
electrical characteristics over recommended operating free-air temperature range, V
CC
= 6 V,
f = 200 kHz (unless otherwise noted)
reference section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Output voltage (pin 16)
IO = 1 mA
2.4
2.5
2.6
V
O tp t oltage change
ith temperat re
TA = 20
C to 25
C
0.1%
1%
Output voltage change with temperature
TA = 25
C to 85
C
0.2%
1%
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.
undervoltage lockout section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Upper threshold voltage (VCC)
2.72
V
Lower threshold voltage (VCC)
IO( f) 0 1 mA
TA 25
C
2.6
V
Hysteresis (VCC)
IO(ref) = 0.1 mA,
TA = 25
C
80
120
mV
Reset threshold voltage (VCC)
1.5
1.9
V
All typical values are at TA = 25
C.
short-circuit protection control section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
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
A
Comparator threshold voltage (FEEDBACK)
1.18
V
All typical values are at TA = 25
C.
oscillator section
PARAMETER
TEST CONDITIONS
TL1451C
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Frequency
CT = 330 pF,
RT = 10 k
200
kHz
Standard deviation of frequency
CT = 330 pF,
RT = 10 k
10%
Frequency change with voltage
VCC = 3.6 V to 40 V
1%
Frequency change with temperature
TA = 20
C to 25
C
0.4%
2%
Frequency change with temperature
TA = 25
C to 85
C
0.2%
2%
All typical values are at TA = 25
C.
TL1451A
DUAL PULSE WIDTH MODULATION CONTROL CIRCUITS
SLVS024E FEBRUARY 1983 REVISED NOVEMBER 1999
5
www.ti.com
dead-time control section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input bias current (DTC)
1
A
Latch mode (source) current (DTC)
TA = 25
C
80
145
A
Latched input voltage (DTC)
IO = 40
A
2.3
V
Input threshold voltage at f
10 kHz (DTC)
Zero duty cycle
2.05
2.25
V
Input threshold voltage at f = 10 kHz (DTC)
Maximum duty cycle
1.2
1.45
V
All typical values are at TA = 25
C.
error-amplifier section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
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
1.05
Common-mode input voltage range
VCC = 3.6 V to 40 V
1.05
to
V
Common mode in ut voltage range
VCC = 3.6 V to 40 V
to
1.45
V
Open-loop voltage amplification
RF = 200 k
70
80
dB
Unity-gain bandwidth
1.5
MHz
Common-mode rejection ratio
60
80
dB
Positive output voltage swing
Vref0.1
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
A
All typical values are at TA = 25
C.
output section
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Collector off-state current
VO = 50 V
10
A
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
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input threshold voltage at f
10 kHz (FEEDBACK)
Zero duty cycle
2.05
2.25
V
Input threshold voltage at f = 10 kHz (FEEDBACK)
Maximum duty cycle
1.2
1.45
V
All typical values are at TA = 25
C.
total device
PARAMETER
TEST CONDITIONS
TL1451AC
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Standby supply current
Off-state
1.3
1.8
mA
Average supply current
RT = 10 k
1.7
2.4
mA
All typical values are at TA = 25
C.
PDF 
ZIP