Datasheet

UNISONIC TECHNOLOGIES CO., LTD
TL1451
LINEAR INTEGRATED CIRCUIT
DUAL
PULSE-WIDTH-MODULATION
CONTROL CIRCUITS

SOP-16
DESCRIPTION
The UTC TL1451 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 UTC TL1451 contains an on-chip
2.5V regulator, two error amplifiers, an adjustable oscillator, two
dead-time comparators, undervoltage lockout circuitry, and dual
common –emitter output transistor circuits.

DIP-16
TSSOP-16
FEATURES
*Complete PWM power control circuitry
*Completely synchronized operation
*Internal undervoltage lockout protection
*Wide supply voltage range
*Internal Short-Circuit protection
*Oscillator frequency 500kHz max
*Variable dead time provides control over total range
*Internal regulator provides a stable 2.5V reference supply

ORDERING INFORMATION
Ordering Number
Lead Free
TL1451L-D16-T
-

Halogen Free
TL1451G-D16-T
TL1451G-P16-R
TL1451G-S16-R
Package
Packing
DIP-16
TSSOP-16
SOP-16
Tube
Tape Reel
Tape Reel
MARKING
DIP-16
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
SOP-16 / TSSOP-16
1 of 14
QW-R103-011.F
TL1451

LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
CT
1
16
REF
RT
2
15
SCP
1 IN+
3
14 2 IN+
1 IN-
4
13 2 IN-
1 FEEDBACK
5
12
2 FEEDBACK
1 DTC
6
11
2 DTC
1 OUT
7
10
2 OUT
GND
8
9
ERROR
AMPLIFIER 1

ERROR
AMPLIFIER 2
VCC
BLOCK DIAGRAM
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2 of 14
QW-R103-011.F
TL1451

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (TA=25C, unless otherwise specified)
PARAMETER
Supply Voltage
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current
VALUE
UNIT
51
V
20
V
51
V
21
mA
DIP-16
1000
Power Dissipation
PD
mW
SOP-16
500
TSSOP-16
700
Junction Temperature
TJ
+125
C
Operating Temperature
TOPR
-20 ~ +85
C
Storage Temperature
TSTG
-40 ~ +150
C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

SYMBOL
VCC
VIN
VOUT
IOUT
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current(each Transistor)
Current into Feedback Terminal
Feedback Resistor
Timing Capacitor
Timing Resistor
Oscillator frequency
Operating Temperature

SYMBOL
VCC
VIN
VOUT
IOUT
IFB
RF
CT
RT
FOSC
TOPR
MIN
3.6
1.05
TYP
MAX
50
1.45
50
20
45
100
150
8
1
-20
UNIT
V
V
V
mA
μA
kΩ
pF
kΩ
kHz
C
15000
100
350
85
ELECTRICAL CHARACTERISTICS (VCC=6V, f=200kHz, Ta=25C, unless otherwise specified.)
PARAMETER
Reference Section
Output Voltage
SYMBOL
VOUT
Output Voltage Change with Temperature
Input Voltage Regulation
Output Voltage Regulation
Short-Circuit Output Current
Undervoltage Lockout Section
Threshold Voltage (Vcc)
△VIN
△VOUT
IOUT
Upper
Lower
Hysteresis (Vcc)
Reset Threshold voltage (Vcc)
Short-Circuit Protection Control Section
Input Threshold Voltage(SCP)
Standby Voltage(SCP)
Latched Input Voltage (SCP)
Input (source) Current
Comparator Threshold Voltage (FEEDBACK)
IOUT=1mA
Ta= -20C ~ 25C
Ta= 25C ~ 85C
Vcc=3.6V ~ 40V
IOUT=0.1mA ~ 1mA
VOUT=0
MIN
TYP
MAX
UNIT
2.4
2.6
1
1
12.5
7.5
30
V
3
2.5
-0.1
-0.2
2
1
10
1.5
2.72
2.6
120
1.9
VTHR
VHYS
VIN(THR)
VSTN-BY
VIN(LAT)
IIN(source)
VTHR
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TEST CONDITIONS
IOUT(REF)=0.1mA
No pullup
No pullup
VIN=0.7V
0.60
140
-10
0.67
185
60
-15
1.18
%
mV
mV
mA
V
V
mV
V
0.75
230
120
-20
V
mV
mV
μA
V
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TL1451

LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
Oscillator Section
Frequency
Standard deviation of frequency
Frequency Change with Voltage
SYMBOL
F
Frequency Change with Temperature
Dead-Time Control Section
Input bias Current (DTC)
Latch mode (source) Current (DTC)
Latched Input Voltage (DTC)
VIN
VIN(THR)
Error-Amplifier Section
Input Offset Voltage
Input Offset Current
Input Bias current
VIN(OFF)
IIN(OFF)
IIN(BIAS)
Open-loop Voltage Amplification
Unity-gain Bandwidth
Common-mode Rejection Ratio
Positive Output Voltage Swing
Negative Output Voltage Swing
Output (sink) Current (FEEDBACK)
Output (source) Current (FEEDBACK)
Output Section
Collector off-state Current
Output Saturation Voltage
Short-Circuit Output Current
PWM Comparator Section
Input Threshold Voltage at f=10kHz
(FEEDBACK)
TOTAL DEVICE
Standby Supply Current
Average Supply Current
VIN(CM)
CT=330pF, RT=10kΩ
CT=330pF, RT=10kΩ
Vcc=3.6V ~ 40V
TA=-20C ~ 25C
TA=25C ~ 85C
TYP
200
10%
1%
-0.4
-0.2
IOUT=40A
Zero duty cycle
Maximum duty cycle
-80
2.3
1.2
VOUT (FEEDBACK)=1.25V
VOUT (FEEDBACK)=1.25V
VOUT (FEEDBACK)=1.25V
Vcc=3.6V ~ 40V
RF=200kΩ
IOUT(SIN)
IOUT(SOU)
ISTN-BY
2.05
1.45
60
Vref-0.1
2
2
2.25
6
100
500
0.5
-30
Zero duty cycle
Maximum duty cycle
80
1.5
80
Off-state
RT=10kΩ
1.6
-40
1.2
90
1.2
%
μA
μA
V
V
mV
nA
nA
V
1
VID=-0.1V, VOUT=1.25V
VID=0.1V, VOUT=1.25V
UNIT
kHz
-145
160
1. 05~
1.45
70
IOFF
VOUT=50V
VOUT(SAT) IOUT=10mA
IOUT(SHT) VOUT=6V
VI(THR)
MAX
1
BG
RR
VOUT
VOUT
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MIN
IIN(BIAS)
Input threshold Voltage at f=10kHz (DTC)
Common-Mode Input Voltage Range
TEST CONDITIONS
10
2
2.05
1.45
2.25
1.3
1.7
1.8
2.4
dB
MHz
dB
V
V
mA
μA
μA
V
mA
V
mA
mA
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TL1451

LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
Test
Input
S1
VCC = 5V
CPE
0.47μF
RL
4.7kΩ
OUT1
16 15 14 13 12 11 10 9
OUT2
RL
4.7kΩ
UTC TL1451
1
CT
330pF
2
3
4
5
6
7
8
RT
10kΩ
Test
Input

TIMING DIAGRAM
Oscillator Triangle Waveform
2.0V
1.6V
1.4V
1.25V
Error Amplifier Output
Dead-Time Input Voltage
Short-Circuit Protection
Comparator Input Voltage
PWM Comparator Output Voltage
H
L
Dead Time 100%
H
Output Transistor Collector
Waveform
L
0.6V
Protection Enable
Terminal Waveform
Tpe*
H
Short-Circuit Protection
Comparator Output
Power Supply Voltage
0V
2.8V TYP
L
3.6V
0V
* Protection Enable Time, tpe = (0.051 × 106 × Cpe) in seconds
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5 of 14
QW-R103-011.F
TL1451

LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
HIGH-SPEED DUAL SWITCHING REGULATOR
VCC
220kΩ
0.47μF
150Ω
470Ω
50kΩ
33kΩ
L1
330pF
R1
R2
33kΩ
R3
C2
33kΩ
33kΩ
R4
Step-Up
Output
C1
500pF
Vref
16 15 14 13 12 11 10 9
UTC TL1451
1
2
3
4
5
6
7
8
470Ω
470Ω
R5
C5
220Ω
500pF
1μF
L2
R6
33kΩ
470Ω
33kΩ
C4
R7
Step-Down
Output
NOTE A: Values for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application.
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6 of 14
QW-R103-011.F
TL1451
TYPICAL CHARACTERISTICS
Protection Enable Time vs.
Protection Enable Capacitance
Protection Enable Time, tpe (s)
18
15
12
9
6
3
0
100
250
50
200
0
150
Protection Enable Capacitance, CPE (µF)
VREF
SCP
16
15
170kO
Short-circuit
Protection
Comparator
12kO
CPE
ERROR AMP 1
ERROR AMP 2
VREF
VREF
S
R
Protection
Latch
U.V.L.O.
+
1.25V
-
Closed-Loop Gain and Phase Shift vs. Frequency
60
50
VCC = 5V
RREF = 150O
CREF = 470pF
TA = 25°C
CX:
47pF
470pF
4700pF
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
0°
-10°
-20°
-30°
-40°
40
30
Phase Shift
70
Closed-Loop Gain (dB)

LINEAR INTEGRATED CIRCUIT
-50°
-60°
-70°
-80°
-90°
20
10
0
100
10k
1k
100k
1M
Frequency, f (Hz)
VREF
+
-
39kO
39kO
UNISONIC TECHNOLOGIES CO., LTD
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CX
RREF
CREF
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QW-R103-011.F
TL1451
TYPICAL CHARACTERISTICS(cont.)
Closed-Loop Gain and Phase Shift vs. Frequency
VCC = 5V
RREF = 15O
Closed-Loop Gain (dB)
60
CREF = 470pF
TA = 25°C
50
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
47pF
470pF
4700pF
0°
-10°
-20°
-30°
-40°
40
30
Phase Shift
70
-50°
-60°
-70°
-80°
-90°
20
10
0
100
10k
1k
1M
100k
Frequency, f (Hz)
VREF
+
-
CX
39kO
RREF
CREF
39kO
Closed-Loop Gain and Phase Shift vs. Frequency
60
50
VCC = 5V
RREF = 15O
CREF = 470pF
TA = 25°C
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
47pF
470pF
4700pF
0°
-10°
-20°
-30°
-40°
40
30
Phase Shift
70
Closed-Loop Gain (dB)

LINEAR INTEGRATED CIRCUIT
-50°
-60°
-70°
-80°
-90°
20
10
0
100
10k
1k
100k
1M
Frequency, f (Hz)
VREF
+
-
39kO
39kO
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CX
RREF
CREF
8 of 14
QW-R103-011.F
TL1451
TYPICAL CHARACTERISTICS(Cont.)
Closed-Loop Gain and Phase Shift vs. Frequency
70
60
VCC = 5V
CREF = 470pF
TA = 25°C
50
40
Closed-Loop Gain
(Left Scale)
0°
-10°
-20°
-30°
-40°
Phase Shift
(Right Scale)
30
Phase Shift
Closed-Loop Gain (dB)

LINEAR INTEGRATED CIRCUIT
-50°
-60°
-70°
-80°
-90°
20
10
0
100
1k
100k
10k
1M
Frequency, f (Hz)
VREF
+
-
39kO
39kO
UNISONIC TECHNOLOGIES CO., LTD
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CREF
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QW-R103-011.F
TL1451

LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)
O u tp u t S in k C u rre n t vs.
C o lle cto r O u tp u t S a tu ra tio n V o lta g e
12 0
T A = -2 0 ?
11 0
T A = 2 5?
Output Sink Current (mA)
10 0
90
TA = 85?
80
70
60
50
40
30
20
10
0
V C C = 3 .6 V
5
0
15
10
20
C o lle cto r O u tp u t S a tu ra tio n V o lta g e (V )
VO (REF) -0.01
1
VO (REF) -0.02
0.9
Maximum Output Voltage
Swing (Right Scale)
VO (REF) -0.03
0.8
VO (REF) -0.04
VO (REF) -0.05
0.7
Maximum Output
Voltage Swing (Right Scale)
0.6
0.5
VO (REF) -0.06
VO (REF) -0.07
-25
0
25
50
75
Maximum Output Voltage Swing, VOM (V)
Maximum Output Voltage Swing, VOM (V)
Maximum Output Voltage Swing vs.
Free-Air Temperature
VREF
33kO
+
33kO
-
RL
Vvom - 1 100kO
VCC = 3.6V
RL = 100kO
VOM+1 = 1.25V
VOM-1 = 1.15V (Right Scale)
VOM-1 = 1.35V (Left Scale)
100
Free-Air Temperature, TA (°C)
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10 of 14
QW-R103-011.F
TL1451

LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Triangle Oscillator Frequency vs.
Timing Resistance
1M
Oscillator Frequency Variation vs.
Free-Air Temperature
3
VCC = 5V
TA = 25°C
VCC = 3.6V
RT = 10kΩ
CT = 330pF
fOSC = 200kHz
2
CT = 150pF
1
100k
0
CT = 1500pF
-1
10k
-2
CT = 15000pF
1k
1k
4k
10k
40k
100k
400k
-3
1M
-25
Triangle Waveform Awing Voltage vs.
Timing Capacitance
2.6
102
VCC = 5V
RT = 8kΩ
TA = 25°C
2.4
2.2
25
0
50
100
75
Free - Air Temperature, TA (°C)
Timing Resistance, RT (Ω)
Triangle Waveform Period vs.
Timing Capacitance
VCC = 5V
RT = 8kΩ
TA = 25°C
101
2
1.8
1.6
100
1.4
1.2
1
0.8
101
102
103
104
10-1
101
105
Reference Output Voltage Variation vs.
Free-Air Temperature
30
20
VCC = 3.6V
II(REF) = 1mA
10
0
-10
-20
-30
-25
0
50
75
Free - Air Temperature, TA (°C)
25
100
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103
104
105
Timing Capacitance, CT (pF)
Reference Output Voltage Variation, ? VO(REF) (mV)
Reference Output Voltage Variation, ? VO(REF) (mV)
Timing Capacitance, CT (pF)
102
Reference Output Voltage Variation vs.
Free-Air Temperature
30
20
VCC = 40V
II(REF) = 1mA
10
0
-10
-20
-30
-25
0
25
50
100
75
Free - Air Temperature, TA (°C)
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TL1451
TYPICAL CHARACTERISTICS(Cont.)
Dropout Voltage Variation vs.
Free-Air Temperature
Reference Output Voltage vs. Supply Voltage
3
1.1
II(REF) = 1mA
Reference Output Voltage, VO(REF) (V)
TA = 25°C
2
1.5
1
0.5
0
1
Dropout Voltage Variation (V)
2.5
0
10
5
20
15
25
35
30
0.9
0.8
0.7
0.6
-25
40
Undervoltage Lockout Threshold Voltage (V)
Output Collector Voltage, VCE (V)
Undervoltage Lockout Characteristics
TA = 25°C TA = 20°C
TA = 85°C
5
4
3
5V
RL
2
1
7,12
I = IO
8
VDE
IO =10mA
0
0
1
2
5
4
3
100
75
Free - Air Temperature, TA (°C )
Undervoltage Lockout Hysteresis
Characteristics
6
50
25
0
Supply Voltage, VCC (V)
3.5
300
II(REF) = 1mA
3.25
250
Threshold Voltage-VTH
(Left Scale)
3
200
Threshold Voltage-VTL
(Left Scale)
2.75
150
2.5
100
Threshold Voltage
(Right Scale)
2.25
50
2
0
0
-25
Supply Voltage, VCC (V)
25
50
75
Undervoltage Lockout Hystersis Voltage (mV)

LINEAR INTEGRATED CIRCUIT
100
Free - Air Temperature, TA (°C)
Gain (Amplfier In Unity-Gain Configuration) vs.
Frequency
10
Short-Circuit Protection
Latch Reset Supply Voltage
(Right Scale)
1.25
2.5
2
1.20
1.15
Short-Circuit Protection
Comparator Threshold Voltage
(Left Scale)
1.5
5
1
1.10
-25
0
25
50
75
100
Free - Air Temperature, TA (°C)
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VCC = 5V
TA = 25°C
0
G-Gain (dB)
3
1.30
RS-Latch Reset Supply Voltage (V)
Compretor Threshold Voltage (V)
Short-Circuit Protection Characteristics
-5
-10
-15
-20
1k
10k
100k
1M
10M
Frequency, f (Hz)
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TL1451
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)

Open-Loop Voltage Amplification vs.
Frequency
2.25
2
1.75
1.5
1.25
1
1.75
0.5
0.25
0
10k
1k
0
1M
100k
20
60
50
40
30
20
10
1k
100k
1M 2M
Output Transistor on Duty Cycle vs.
Dead-Time Input Voltage
Standby Current vs. Supply Voltage
TA = 25°C
2
40
50
60
70
80
1.75
1.5
1.25
1
0.75
0.5
0.25
90
0
0.5
1
1.5
2
2.5
3
0
4
3.5
0
Stand-By Current, VCC = 40V, No Load
1.25
1
Stand-By Current, VCC = 3.6V, No Load
0.75
0.5
0.25
0
-25
75
Free-Air Temperature, TA (°C)
0
25
50
100
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Maximum Continuous Power Dissipation (mW)
1.5
40
Maximum Continuous Power Disspation vs.
Free-Air Temperature
Average Supply Current
VCC = 6V, RT = 10kO
CT = 330pF
1.75
30
Supply Voltage, VCC (V)
Standby Current vs.
Free-Air Temperature
2
20
10
Dead-Time Input Voltage (V)
Supply Current, ICC (mA)
10k
Frequency, f (Hz)
30
100
70
Frequency, f (Hz)
VCC = 3.6V
RT = 10kO
CT = 330pF
10
VCC = 5V
TA = 25°C
80
0
100
10M
Standby Current, ICC (mA)
Output Transistor “On” Duty Cycle (%)
90
VCC = 5V
TA = 25°C
Open-Loop Voltage Amplification (dB)
Error Amp Maxmum Output Voltage Swing (V)
Error Amp Maximum Output Voltage Swing vs.
Frequency
1200
1100
1000
DIP-16
Thermal Resistance
125°C/W
900
800
700
600
500
SOP-16
400
Thermal Resistance
250°C/W
300
200
100
0
-25
0
25
50
75
100
Free-Air Temperature, TA (°C)
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TL1451
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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QW-R103-011.F
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