TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
FEATURES
•
•
•
•
•
•
•
•
•
•
(1)
Controlled Baseline
– One Assembly/Test Site, One Fabrication
Site
Enhanced Diminishing Manufacturing
Sources (DMS) Support
Enhanced Product-Change Notification
Qualification Pedigree (1)
Complete Pulse-Width Modulation (PWM)
Power-Control Circuitry
Completely Synchronized Operation
Internal Undervoltage Lockout Protection
Wide Supply-Voltage Range
Internal Short-Circuit Protection
Oscillator Frequency . . . 500 kHz Max
•
•
Variable Dead Time Provides Control Over
Total Range
Internal Regulator Provides a Stable 2.5-V
Reference Supply
D PACKAGE
(TOP VIEW)
CT
RT
Error
1IN+
Amplifier 1 1IN −
1FEEDBACK
1DTC
1OUT
GND
1
16
2
15
3
14
4
13
5
12
6
7
11
10
8
9
REF
SCP
2IN+ Error
2IN− Amplifier 2
2FEEDBACK
2DTC
2OUT
VCC
Component qualification in accordance with JEDEC and
industry standards to ensure reliable operation over an
extended temperature range. This includes, but is not limited
to, Highly Accelerated Stress Test (HAST) or biased 85/85,
temperature cycle, autoclave or unbiased HAST,
electromigration, bond intermetallic life, and mold compound
life. Such qualification testing should not be viewed as
justifying use of this component beyond specified
performance and environmental limits.
DESCRIPTION/ORDERING INFORMATION
The TL1451A-EP 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-EP
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.
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 VCC conditions, the undervoltage lockout control circuit feature
locks the outputs off until the internal circuitry is operational.
The TL1451A-EP is characterized for operation from –55°C to 125°C.
ORDERING INFORMATION
PACKAGE (1)
TA
–55°C to 125°C
(1)
SOIC – D
Tape and reel
ORDERABLE PART NUMBER
TL1451AMDREP
TOP-SIDE MARKING
TL1451EPG4
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
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.
Copyright © 2005, 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.
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
FUNCTIONAL BLOCK DIAGRAM
2DTC
Error
Amplifier 2
2IN+
2IN−
2 FEEDBACK
1 FEEDBACK
SCP
VCC
RT
9
2
11
14
13
CT
1
10
+
12
Oscillator
1/2 Vref
5
15
16
R
S
1IN−
3
4
REF
UVLO
R
1IN+
PWM
COMP
Reference
Voltage
12 kΩ
170 kΩ
Error
Amplifier 1
2OUT
−
+
7
−
1OUT
PWM
Comparator
1DTC
6
8
GND
COMPONENT COUNT
Resistors
65
Capacitors
8
Transistors
JFETs
105
18
Absolute Maximum Ratings (1)
over operating free-air temperature range
MIN
MAX
UNIT
VCC
Supply voltage
51
V
VI
Amplifier input voltage
20
V
VO
Collector output voltage
51
V
IO
Collector output current
21
mA
Continuous power total dissipation
TA
Operating free-air temperature range
Tstg
Storage temperature range
Lead temperature
(1)
2
See Dissipation Rating Table
M suffix
1,6 mm (1/16 in) from case for 10 s
–55
125
°C
–65
150
°C
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.
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
Dissipation Ratings
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
Recommended Operating Conditions
MIN
VCC
Supply voltage
VI
Amplifier input voltage
VO
IO
MAX
UNIT
3.6
50
V
1.05
1.45
V
Collector output voltage
50
V
Collector output current
20
mA
Current into feedback terminal
45
µA
RF
Feedback resistor
100
CT
Timing capacitor
150
15000
RT
Timing resistor
5.1
100
kΩ
1
500
kHz
–55
125
°C
MAX
UNIT
Oscillator frequency
TA
Operating free-air temperature
M suffix
kΩ
pF
Reference Section Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
Output voltage (pin 16)
TEST CONDITIONS
IO = 1 mA
TA = 25°C
MIN
2.4
2.5
2.6
2.35
2.46
2.65
–0.63%
±4% (2)
2
12.5
TA = 125°C
0.7
15
TA = MIN
0.3
30
1
7.5
TA = 125°C
0.3
14
TA = MIN
0.3
20
10
30
TA = MIN and 125°C
Output voltage change with temperature
TA = 25°C
Input voltage regulation
VCC = 3.6 V to 40 V
TA = 25°C
Output voltage regulation
Short-circuit output current
(1)
(2)
IO = 0.1 mA to 1 mA
VO = 0
TYP (1)
3
V
mV
mV
mA
All typical values are at TA = 25°C, unless otherwise indicated.
These parameters are not production tested.
3
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
Undervoltage Lockout Section Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
Upper threshold voltage (VCC)
TEST CONDITIONS
MIN
TA = 25°C
2.72
TA = 125°C
1.7
TA = MIN
Lower threshold voltage (VCC)
Reset threshold voltage (VCC)
2.6
TA = 125°C
1.65
UNIT
V
V
3.09
TA = 25°C
80
120
TA = 125°C
10
50
TA = MIN
10
60
TA = 25°C
1.5
TA = 125°C
0.95
TA = MIN
(1)
MAX
3.15
TA = 25°C
TA = MIN
Hysteresis (VCC)
TYP (1)
mV
V
1.5
All typical values are at TA = 25°C, unless otherwise indicated.
Short-Circuit Protection Control Section Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Input threshold voltage (SCP)
TYP (1) MAX
TA = 25°C
650
700
750
TA = 125°C
400
478
650
TA = MIN
800
880
950
140
Standby voltage (SCP)
Latched input voltage (SCP)
MIN
185
230
TA = 25°C
60
120
TA = 125°C
70
120
60
120
TA = MIN
UNIT
mV
mV
mV
Equivalent timing resistance
170
kΩ
Comparator threshold voltage (FEEDBACK)
1.18
V
(1)
All typical values are at TA = 25°C, unless otherwise indicated.
Oscillator Section Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
Frequency
Standard deviation of frequency
Frequency change with voltage
TEST CONDITIONS
CT = 330 pF,
RT = 10 kΩ
CT = 330 pF,
VCC = 3.6 V to 40 V
TA = 25°C
200
TA = 125°C
195
TA = MIN
193
RT = 10 kΩ
2%
TA = 25°C
1%
TA = 125°C
1%
TA = MIN
Frequency change with temperature
(1)
(2)
4
All typical values are at TA = 25°C, unless otherwise indicated.
These parameters are not production tested.
MIN TYP (1)
MAX
kHz
3%
1.37%
UNIT
±10% (2)
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
Dead-Time Control Section Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Input bias current (DTC)
1
TA = MIN and 125°C
3
–80
Latched input voltage (DTC)
TA = 25°C
2.3
TA = 125°C
2.22
TA = MIN
2.28
Maximum duty cycle
UNIT
µA
–145
µA
2.32
V
2.4
Zero duty cycle
Input threshold voltage at f = 10 kHz (DTC)
MAX
TA = 25°C
Latch mode (source) current (DTC)
(1)
(2)
TYP (1)
MIN
2.25 (2)
2.05
1.2 (2)
V
1.45
All typical values are at TA = 25°C, unless otherwise indicated.
These parameters are not production tested.
Error-Amplifier Section Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
Input offset voltage
Input offset current
Input bias current
Common-mode input voltage range
Open-loop voltage amplification
TEST CONDITIONS
VO (FEEDBACK) = 1.25 V
VO (FEEDBACK) = 1.25 V
VO (FEEDBACK) = 1.25 V
TYP (1)
±7
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
70
80
TA = 125°C
70
80
TA = MIN
64
Common-mode rejection ratio
60
Positive output voltage swing
2
Output (source) current (FEEDBACK)
(1)
nA
nA
dB
80
MHz
80
dB
V
1
VID = 0.1 V, VO = 1.25 V
mV
1.5
Negative output voltage swing
VID = –0.1 V, VO = 1.25 V
UNIT
V
TA = 25°C
Unity-gain bandwidth
Output (sink) current (FEEDBACK)
MAX
TA = 25°C
VCC = 3.6 V to 40 V
RF = 200 kΩ
MIN
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
V
mA
µA
All typical values are at TA = 25°C, unless otherwise indicated.
5
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
Output Section Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Collector off-state current
MIN
TYP (1)
VO = 50 V
10
TA = 25°C
Output saturation voltage
TA = 125°C
Short-circuit output current
(1)
MAX
1.2
2
1.6
2.4
TA = MIN
1.36
2.2
VO = 6 V
90
UNIT
µA
V
mA
All typical values are at TA = 25°C, unless otherwise indicated.
PWM Comparator Section Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
Zero duty cycle
Input threshold voltage at f = 10 kHz (FEEDBACK)
(1)
(2)
MIN
Maximum duty cycle
1.2 (2)
TYP (1)
MAX
2.05
2.25 (2)
1.45
UNIT
V
All typical values are at TA = 25°C, unless otherwise indicated.
These parameters are not production tested.
Total Device Electrical Characteristics
over recommended operating free-air temperature range, VCC = 6 V, f = 200 kHz (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP (1)
MAX
UNIT
Standby supply current
Off-state
1.3
1.8
mA
Average supply current
RT = 10 kΩ
1.7
2.4
mA
(1)
6
All typical values are at TA = 25°C, unless otherwise indicated.
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
PARAMETER MEASUREMENT INFORMATION
Test
Input
S1
VCC = 5 V
RL
CPE
0.47 µF
4.7 kΩ
OUT1
RL
4.7 kΩ
16 15 14 13 12 11 10
OUT2
9
TL1451A-EP
1
CT
330 pF
2
3
4
5
6
7
8
RT
10 kΩ
Test
Input
Figure 1. Test Circuit
Oscillator Triangle Waveform
Error-Amplifier Output
Dead-Time Input Voltage
Short-Circuit Protection
Comparator Input Voltage
PWM Comparator Output Voltage
2.0 V
1.6 V
1.4 V
1.25 V
H
L
Dead Time 100%
H
Output Transistor Collector
Waveform
L
0.6 V
Protection Enable
Terminal Waveform
0V
tpe(1)
H
Short-Circuit Protection
Comparator Output
Power-Supply Voltage
L
2.8 V TYP
3.6 V
0V
(1) Protection enable time, tpe = (0.051 x 106 x Cpe) in seconds
Figure 2. TL1451A-EP Timing
7
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS
Years Estimated Life
70
60
50
40
30
20
10
0
105
115
125
135
145
Continous Tj – °C
Figure 3. Estimated Deviced Life at Elevated Temperatures for Wirebond Voiding Fail Mode
3
VCC = 5 V
TA = 25°C
CT = 150 pF
100 k
CT = 1500 pF
10 k
CT = 15000 pF
1k
1k
4k
10 k
40 k
100 k
400 k
RT − Timing Resistance − Ω
Figure 4. Triangle Oscillator Frequency
vs Timing Resistance
8
f osc − Oscillator Frequency Variation − %
∆afosc
ffosc
osc − Triangle Oscillator Frequency − Hz
1M
1M
2
1
0
−1
VCC = 3.6 V
RT = 10 kΩ
CT = 330 pF
fosc = 200 kHz
−2
−3
−25
0
25
50
75
TA − Free-Air Temperature − °C
Figure 5. Oscillator Frequency Variation
vs Free-Air Temperature
100
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
102
2.6
VCC = 5 V
RT = 5.1 kΩ
TA = 25°C
Triangle Waveform Period − uS
µs
Triangle Waveform Swing Voltage − V
2.4
2.2
2
1.8
1.6
1.4
1.2
VCC = 5 V
RT = 5.1 kΩ
TA = 25°C
101
100
1
0.8
101
102
103
104
CT − Timing Capacitance − pF
10−1
101
105
30
VCC = 3.6 V
II(ref) = 1 mA
20
10
0
−10
− 20
− 30
− 25
0
25
50
75
TA − Free-Air Temperature − °C
Figure 8. Reference Output Voltage Variation
vs Free-Air Temperature
105
Figure 7. Triangle Waveform Period
vs Timing Capacitance
avref − Reference Output Voltage Variation − mV
∆VO(ref)
avref − Reference Output Voltage Variation − mV
∆VO(ref)
Figure 6. Trangle Waveform Swing Voltage
vs Timing Capacitance
102
103
104
CT − Timing Capacitance − pF
100
30
VCC = 40 V
II(ref) = 1 mA
20
10
0
−10
− 20
− 30
− 25
0
25
50
75
TA − Free-Air Temperature − °C
100
Figure 9. Reference Output Voltage Variation
vs Free-Air Temperature
9
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
1.1
II(ref) = 1 mA
TA = 25°C
2.5
1
Dropout Voltage Variation − V
VO(ref)
Vref − Reference Output Voltage − V
3
2
1.5
1
0.9
0.8
0.7
0.6
0.5
0
5
10
15
20
25
30
VCC − Supply Voltage − V
35
− 25
40
Figure 10. Reference Output Voltage
vs Supply Voltage
− Output Collector Voltage − V
VVCE
CE
TA = 85°C
TA = 25°C
4
3
5V
RL
7,10
I = IO
8
VDE
1
IO = 10 mA
0
0
1
2
3
4
VCC − Supply Voltage − V
Figure 12. Undervoltage Lockout Hysteresis
Characteristics
10
300
3.5
TA = −20°C
5
2
100
Figure 11. Dropout Voltage Variation
vs Free-air Temperature
Undervoltage Lockout Threshold Voltage − V
6
0
25
50
75
TA − Free-Air Temperature − °C
5
3.25
Threshold Voltage −VTH
(Left Scale)
3
250
200
Threshold Voltage −VTL
(Left Scale)
2.75
150
2.5
100
Hysteresis Voltage
(Right Scale)
50
2.25
0
2
−25
0
25
50
75
100
TA − Free-Air Temperature − °C
Figure 13. Undervoltage Lockout Characteristics
Undervoltage Lockout Hystersis Voltage − mV
0
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
Comparator Threshold Voltage − V
Short-Circuit Protection
Latch Reset Supply Voltage
(Right Scale)
1.25
2.5
2
1.20
Short-Circuit Protection
Comparator Threshold Voltage
(Left Scale)
1.15
1.10
− 25
1.5
0
25
50
75
TA − Free-Air Temperature − °C
RS − Latch Reset Supply Voltage − V
3
1.30
1
100
Figure 14. Short-Circuit Protection Characteristics
18
tpe
t pe − Protection Enable Time − s
15
12
9
6
3
0
0
50
100
150
200
CPE − Protection Enable Capacitance − µF
SCP
15
Vref
16
170 kΩ
Short-circuit
Protection
Comparator
12 kΩ
CPE
ERROR AMP 1
ERROR AMP 2
250
Vref
S
R
Protection
Latch
Vref
U.V.L.O.
+
1.25 V
−
Figure 15. Protection Enable Time vs Protection Enable Capacitance
11
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
2
90
VCC = 5 V
TA = 25°C
Open-Loop Voltage Amplification − dB
Error Amp Maximum Output Voltage Swing − V
2.25
1.75
1.5
1.25
1
0.75
0.5
0.25
0
1k
10 k
100 k
f − Frequency − Hz
1M
VCC = 5 V
TA = 25°C
80
70
60
50
40
30
20
10
0
100
10 M
Figure 16. Error Amplifier Maximum Output Voltage
Swing vs Frequency
1k
10 k
100 k
f − Frequency − Hz
Figure 17. Open-Loop Voltage Amplification
vs Frequency
10
VCC = 5 V
TA = 25°C
5
G − Gain − dB
0
−5
−10
−15
−20
1k
10 k
100 k
1M
10 M
f − Frequency − Hz
Figure 18. Gain
(Amplifier in Unity-Gain Configuration vs Frequency)
12
1M 2M
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
70
Phase Shift
(Right Scale)
50
40
47 pF
470 pF
4700 pF
0°
Closed-Loop Gain
(Left Scale)
−10°
−20°
30
−30°
Phase Shift
Closed-Loop Gain − dB
60
CX:
VCC = 5 V
Rref = 150 Ω
Cref = 470 pF
TA = 25°C
−40°
−50°
20
−60°
−70°
10
−80°
0
100
1k
10 k
100 k
−90°
1M
f − Frequency − Hz
Vref
+
−
39 kΩ
Cx
Rref
Cref
39 kΩ
Test Circuit
Figure 19. Closed-Loop Gain and Phase Shift vs Frequency
13
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
70
CX:
Phase Shift
(Right Scale)
50
Closed-Loop Gain
(Left Scale)
40
47 pF
470 pF
4700 pF
0°
−10°
−20°
30
−30°
−40°
−50°
20
−60°
−70°
10
−80°
0
100
1k
10 k
100 k
f − Frequency − Hz
Vref
+
−
39 kΩ
Cx
Rref
Cref
39 kΩ
Test Circuit
Figure 20. Closed-Loop Gain and Phase Shift vs Freqency
14
−90°
1M
Phase Shift
Closed-Loop Gain − dB
60
VCC = 5 V
Rref = 15 Ω
Cref = 470 pF
TA = 25°C
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
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SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
70
CX:
50
40
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
47 pF
470 pF
4700 pF
0°
−10°
−20°
30
−30°
Phase Shift
Closed-Loop Gain − dB
60
VCC = 5 V
Rref = 15 Ω
Cref = 470 pF
TA = 25°C
−40°
−50°
20
−60°
−70°
10
−80°
0
100
1k
10 k
100 k
−90°
1M
f − Frequency − Hz
Vref
+
−
39 kΩ
Cx
Rref
Cref
39 kΩ
Test Circuit
Figure 21. Closed-Loop Gain and Phase Shift vs Frequency
15
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
70
50
0°
40
Closed-Loop Gain
(Left Scale)
Phase Shift
(Right Scale)
30
−10°
−20°
−30°
−40°
−50°
20
−60°
−70°
10
−80°
0
100
1k
10 k
100 k
f − Frequency − Hz
Vref
+
−
39 kΩ
Cref
39 kΩ
Test Circuit
Figure 22. Closed-Loop Gain and Phase Shift vs Frequency
120
TA = − 20°C
110
TA = 25°C
Output Sink Current − mA
100
90
TA = 85°C
80
70
60
50
40
30
20
VCC = 3.6 V
10
0
0
5
10
15
Collector Output Saturation Voltage − V
20
Figure 23. Output Sink Current vs Collector Output Saturation Voltage
16
−90°
1M
Phase Shift
Closed-Loop Gain − dB
60
VCC = 5 V
Cref = 470 pF
TA = 25°C
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
VO(ref) −0.01
1
VO(ref) −0.02
0.9
Maximum Output Voltage
Swing (Right Scale)
VO(ref) −0.03
VO(ref) −0.04
Vref
0.8
0.7
Maximum Output
Voltage Swing (Right Scale)
VO(ref) −0.05
0.6
0.5
VO(ref) −0.06
VOM − Maximum Output Voltage Swing − V
VOM − Maximum Output Voltage Swing − V
TYPICAL CHARACTERISTICS (continued)
33 kΩ
+
33 kΩ
−
RL
100 kΩ
Vvom − 1
VCC = 3.6 V
RL = 100 kΩ
VOM+1 = 1.25 V
VOM −1 = 1.15 V (Right Scale)
VOM −1 = 1.35 V (Left Scale)
TEST CIRCUIT
VO(ref) −0.07
−25
0
25
50
75
TA − Free-Air Temperature − °C
100
Figure 24. Maximum Output Voltage Swing vs Free-Air Temperature
VCC = 3.6 V
RT = 10kΩ
CT = 330 pF
Output Transistor On Duty Cycle − %
10
20
30
40
50
60
70
80
90
100
IICC
CC (Standby) − Standby Current − mA
0
TA = 25°C
2
1.75
1.5
1.25
1
0.75
0.5
0.25
0
0
0.5
1
1.5
2
2.5
3
3.5
Dead-Time Input Voltage − V
Figure 25. Output Transistor On Duty Cycle
vs Dead-Time Input Voltage
4
0
10
20
30
VCC − Supply Voltage − V
40
Figure 26. Standby Current vs Supply Voltage
17
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
I CC − Supply Current − mA
ICC
2
1.75
1.5
Average Supply Current
VCC = 6 V, RT = 10 kΩ,
CT = 330 pF
Stand-By Current, VCC = 40 V, No Load
1.25
1
Stand-By Current, VCC = 3.6 V, No Load
0.75
0.5
0.25
0
−25
0
25
50
75
TA − Free-Air Temperature − °C
100
Figure 27. Sandby Current vs Free-Air Temperature
18
Maximum Continuous Power Dissipation − mW
1200
1100
16-Pin N Plastic Dip
1000
Thermal Resistance
125°C/W
900
800
700
600
16-Pin NS Plastic SO
500
400
300
Thermal Resistance
250°C/W
200
100
0
−25
0
25
50
75
TA − Free-Air Temperature – C
100
Figure 28. Maximum Continuous Power Dissipation
vs Free-Air Temperature
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
www.ti.com
SLVS614 – DECEMBER 2005
APPLICATION INFORMATION
VCC
220 kΩ
0.47 µF
150 Ω
470 Ω
50 kΩ
33 kΩ
L1
330 pF
R1
R2
33 kΩ
R3
33 kΩ
33 kΩ
Step-Up
C2 Output
R4
C1
500 pF
Vref
16 15 14 13 12 11 10
9
TL1451A
1
2
3
4
5
6
7
8
470 Ω
470 Ω
R5
C5
220 Ω
500
pF
1 µF
L2
R6
470 Ω
33 kΩ
33 kΩ
Step-Down
C4 Output
R7
Figure 29. High-Speed Dual Switching Regulator
19
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
TL1451AMDREP
ACTIVE
SOIC
D
16
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-55 to 125
TL1451EP
V62/06611-01XE
ACTIVE
SOIC
D
16
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-55 to 125
TL1451EP
(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)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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