UNISONIC TECHNOLOGIES CO., LTD
TL1451 LINEAR INTEGRATED CIRCUIT
www.unisonic.com.tw 1 of 14
Copyright © 2008 Unisonic Technologies Co., LTD QW-R103-011.D
DUAL
PULSE-WIDTH-MODULATION
CONTROL CIRCUITS
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.
FEATURES
*Complete PWM power control circuitry
*Completely synchro nized operation
*Internal undervoltage lockout protection
*Wide supply v oltage 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
DIP-16
SOP-16
TSSOP-16
Lead-free: TL1451L
Halogen-free: TL1451G
ORDERING INFORMATION
Ordering Number
Normal Lead Free Halogen Free Package Packing
TL1451-S16-R TL1451L-S16-R TL1451G-S16-R SOP-16 Tape Reel
TL1451-S16-T TL1451L-S16-T TL1451G-S16-T SOP-16 Tube
TL1451-P16-R TL1451L-P16-R TL1451G-P16-R TSSOP-16 Tape Reel
TL1451-P16-T TL1451L-P16-T TL1451G-P16-T TSSOP-16 Tube
TL1451-D16-T TL1451L-D16-T TL1451G-D16-T DIP-16 Tube
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 2 of 14
www.unisonic.com.tw QW-R103-011.D
PIN CONFIGURATION
CT
RT
1 IN+
1 IN-
1 FEEDBACK
1 DTC
1 OUT
GND Vcc
2 OUT
2 DTC
2 IN-
SCP
REF
2 IN+
2 FEEDBACK
ERROR
AMPLIFIER 1 ERROR
AMPLIFIER 2
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
BLOCK DIAGRAM
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 3 of 14
www.unisonic.com.tw QW-R103-011.D
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise specified)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage VCC 51 V
Amplifier Input Voltage VIN 20 V
Collector Output Voltage VOUT 51 V
Collector Output Current IOUT 21 mA
DIP-16 1000
SOP-16 500
Power Dissipation TSSOP-16 PD 700
mW
Junction Temperature TJ +125 °C
Operating Temperature TOPR -20 ~ +85 °C
Storage Temperature TSTG -40 ~ +150 °C
Note: Absolute maximum ratings are those val ues beyond which the device cou ld be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL MIN TYP MAX UNIT
Supply Voltage VCC 3.6 50 V
Amplifier Input Voltage VIN 1.05 1.45 V
Collector Output Voltage VOUT 50 V
Collector Output Current(each Transistor) IOUT 20 mA
Current into Feedback T erminal IFB 45 μA
Feedback Resistor RF 100 kΩ
Timing Capacitor CT 150 15000 pF
Timing Resistor R T 8 100 kΩ
Oscillator frequency FOSC 1 350 kHz
Operating Temperature TOPR -20 85 °C
ELECTRICAL CHARACTERISTICS(VCC=6V, f=200kHz, Ta=25°C, unless otherwise specified.)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Reference Section
Output Voltage VOUT I
OUT=1mA 2.4 2.5 2.6 V
Ta= -20°C ~ 25°C -0.1 ±1
Output Voltage Change with Temperature Ta= 25°C ~ 85°C -0.2 ±1 %
Input Voltage Regulation △VIN Vcc=3.6V ~ 40V 2 12.5 mV
Output Voltage Regulation △VOUT IOUT=0.1mA ~ 1mA 1 7.5 mV
Short-Circuit Output Current IOUT V
OUT=0 3 10 30 mA
Undervoltage Lockout Section Upper 2.72 V
Threshold Voltage (Vcc) Lower VTHR 2.6 V
Hysteresis (Vcc) VHYS 80 120 mV
Reset Threshold voltage (Vcc)
IOUT(REF)=0.1mA
1.5 1.9 V
Short-Circuit Protection Control Section
Input Threshold Voltage(SCP) VIN(THR) 0.65 0.7 0.75 V
Standby Voltage(SCP) VSTN-BY No pullup 140 185 230 mV
Latched Input Voltage (SCP) VIN(LAT) No pullup 60 120 mV
Input (source) Current IIN(source) VIN=0.7V -10 -15 -20 μA
Comparator Threshold Voltage (FEEDBACK) VTHR 1.18 V
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 4 of 14
www.unisonic.com.tw QW-R103-011.D
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Oscillator Section
Frequency F CT=330pF, RT=10kΩ 200 kHz
Standard deviation of frequen cy CT=330pF, RT=10kΩ 10%
Frequency Change with Voltage Vcc=3.6V ~ 40V 1%
TA=-20°C ~ 25°C -0.4 ±2
Frequency Change with Temperature TA=25°C ~ 85°C -0.2 ±2 %
Dead-Time Control Section
Input bias Current (DTC) IIN(BIAS) 1 μA
Latch mode (source) Current (DT C) -80 -145 μA
Latched Input Voltage (DTC) VIN I
OUT=40μA 2.3 V
Zero duty cycle 2.05 2.25
Input threshold Voltage at f=10kHz (DTC) VIN(THR) Maximum duty cycle 1.2 1.45 V
Error-Amplifier Section
Input Offset Voltage VIN(OFF) V
OUT (FEEDBACK)=1.25V ±6 mV
Input Offset Current IIN(OFF) V
OUT (FEEDBACK)=1.25V ±100 nA
Input Bias current IIN(BIAS) V
OUT (FEEDBACK)=1.25V 160 500 nA
Common-Mode Input Voltage Range VIN(CM) Vcc=3.6V ~ 40V 1. 05~
1.45 V
Open-loop Voltage Amplification RF=200kΩ 70 80 dB
Unity-gain Ban dwidth BG 1.5 MHz
Common-mode Rejection Ra tio RR 60 80 dB
Positive Output Voltage Swing VOUT Vref-0.1 V
Negative Output Voltage Swing VOUT 1 V
Output (sink) Current (FEEDBACK) IOUT(SIN) V
ID=-0.1V, VOUT=1.25V 0.5 1.6 mA
Output (source) Current (FEEDBACK) IOUT(SOU) VID=0.1V, VOUT=1.25V -45 -70 μA
Output Section
Collector off-state Current IOFF V
OUT=50V 10 μA
Output Saturation Voltage VOUT(SAT) IOUT=10mA 1.2 2 V
Short-Circuit Output Current IOUT(SHT) VOUT=6V 90 mA
PWM Comparator Section Zero dut y cycle 2.05 2.25
Input Threshold Voltage at f=10kHz
(FEEDBACK) VI(THR) Maximum duty cycle 1.2 1.45 V
TOTAL DEVICE
Standby Supply Current ISTN-BY Off-state 1.3 1.8 mA
Average Supply Current RT=10kΩ 1.7 2.4 mA
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 5 of 14
www.unisonic.com.tw QW-R103-011.D
TEST CIRCUIT
OUT1
OUT2
RL
4.7kΩ
RL
4.7kΩ
16 15 14 13 12 11 10 9
UTC TL1451
12345678
VCC = 5V
Test
Input
Test
Input
RT
10kΩ
CT
330pF
CPE
0.47μF
S1
TIMING DIAGRAM
Dead Time 100%
2.0V
1.6V
1.4V
1.25V
H
L
H
L
0.6V
0V
H
L
Tpe*
3.6V
0V
2.8V TYP
* Protection Enable Time, tpe = (0.051 × 106 × Cpe) in seconds
Power Supply Voltage
Short-Circuit Protection
Comparator Output
Protection Enable
Terminal Waveform
Output Transistor Collector
Waveform
Oscillator Triangle Waveform
Error Amplifier Output
Dead-Time Input Voltage
Short-Circuit Protection
Comparator Input Voltage
PWM Comparator Output Voltage
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 6 of 14
www.unisonic.com.tw QW-R103-011.D
APPLICATION IN FORMATION
HIGH-SPEED DUAL SWITCHING REGULATOR
16 15 14 13 12 11 10 9
UTC TL1451
12345678
50kΩ
0.47μF
220kΩ
33kΩ
33kΩ
R1
R2
C1
500pF
Vref
33kΩ
33kΩ
330pF
470Ω150ΩL1
VCC
R3
R4 C2 Step-Up
Output
470Ω
1μFL2
R6
R7 C4 Step-Down
Output
220Ω
470Ω
470Ω
C5 R5
500pF
33kΩ33kΩ
NOTE A: Values for R1 through R7, C1 through C4, and L1 and L2 depend upon indi vidual application.
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 7 of 14
www.unisonic.com.tw QW-R103-011.D
TYPICAL CHARACTERISTICS
00 150 20050
12
100
Protection Enable Time vs
Protection Enable Capacitance
Protection Enable Capacitance, CPE (μF)
9
18
250
3
Protection Enable Time, tpe (s)
15
6
170kΩ
12kΩRU.V.L.O.
+
ERROR AMP 1
ERROR AMP 2
Short-circuit
Protection
Comparator
15
-
SProtection
Latch
1.25V
CPE
SCP VREF
VREF VREF
16
010k 100k1k
50
100
Closed-Loop Gain and Phase Shift vs Frequency
Frequency, f (Hz)
30
70
1M
10
Closed-Loop Gain (d B)
60
20
VCC = 5V
RREF = 150Ω
CREF = 470pF
Ta= 25℃Closed-Loop Gain
(Left Scale)
Phase Shift
(Right Scale)
CX: 47pF
470pF
4700pF
40
Phase Shift
-90°
-80°
-70°
-60°
-50°
-40°
-30°
-20°
-10°
0°
+
-
VREF
39kΩ
39kΩ
CREF
RREF
CX
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 8 of 14
www.unisonic.com.tw QW-R103-011.D
TYPICAL CHARACTERISTICS(cont.)
010k 100k1k
50
100
Closed-Loop Gain and Phase Shift vs Frequency
Frequency, f (Hz)
30
70
1M
10
Closed-Loop Gain (dB)
60
20
VCC = 5V
RREF = 15Ω
CREF = 470pF
Ta= 25℃Closed-Loop Gain
(Left Scale)
Phase Shift
(Right Scale)
CX: 47pF
470pF
4700pF
40
Phase Shift
-90°
-80°
-70°
-60°
-50°
-40°
-30°
-20°
-10°
0°
+
-
VREF
39kΩ
39kΩ
CREF
RREF
CX
010k 100k1k
50
100
Close d-Loo p Gain and Phas e Shift vs Frequency
Frequency, f (Hz)
30
70
1M
10
Closed-Loop Gai n (d B)
60
20
VCC = 5V
RREF = 15Ω
CREF = 470pF
Ta= 25℃Closed-Loop Gain
(Left S cale)
Phase Shift
(Right Scale)
CX: 47pF
470pF
4700pF
40
Phase Shift
-90°
-80°
-70°
-60°
-50°
-40°
-30°
-20°
-10°
0°
+
-
VREF
39kΩ
39kΩ
CREF
RREF
CX
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 9 of 14
www.unisonic.com.tw QW-R103-011.D
TYPICAL CHARACTERISTICS(Cont.)
010k 100k1k
50
100
Closed-Loop Gain and Phase Shift vs Frequency
Frequency, f (Hz)
30
70
1M
10
Closed-Loop Gain (dB)
60
20
VCC = 5V
CREF = 470pF
Ta= 25℃
Closed-Loop Gain
(Left Scale) Phase Shift
(Right Scale)
40
Phase Shift
-90°
-80°
-70°
-60°
-50°
-40°
-30°
-20°
-10°
0°
+
-
VREF
39kΩ
39kΩ
CREF
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 10 of 14
www.unisonic.com.tw QW-R103-011.D
TYPICAL CHARACTERISTICS(Cont.)
0010
155
80
O utput Sink Current vs
Collector Output S aturation Voltage
Co lle cto r O u tpu t S a tu ration V o lta g e (V )
60
120
20
20
Output Sink Current (mA)
100
40
Ta = -20℃Ta = 25℃
Ta = 85℃
VCC = 3.6V
10
30
50
70
90
110
VO (REF) -0.07-25 50 750
VO (REF) -0.03
Maximum O utput Voltage Swing vs
Free-Air Temperature
Free-Air Temperature, Ta (℃)
VO (REF) -0.04
VO (REF) -0.01
100
VO (REF) -0.06
Maximum Output Voltage Swing, VOM (V)
VO (REF) -0.02
VO (REF) -0.05 Maximum Output
Voltage Swing (Right Scale)
Maximum Output Voltage
Swing (Right Scale)
25
0.8
0.7
1
0.5
0.9
0.6
Maximum Output Voltage Swing, VOM (V)
+
-
VREF
33kΩ
33kΩ
RL
100kΩ
Vvom - 1
VCC = 3.6V
RL = 100kΩ
VOM+1 = 1.25V
VOM-1 = 1.15V (Right Scale)
VOM-1 = 1.35V ( Left Scale)
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 11 of 14
www.unisonic.com.tw QW-R103-011.D
TYPICAL CHARACTERISTICS
Triangle Oscillator Frequency, tOSC (Hz)
1M
1k 40k 400k4k 10k
Triangle Oscillator Frequency vs
Timing Resistance
Timing Resistance, RT(Ω)
Oscillator Frequency Variation, ΔfOSC (%)
3
-2
-25 50 750
1
25
Oscillator Frequency Variation vs
Free-Air Temperature
Free - Air Temperature, Ta ()
0
-3
2
100k
10k
1k
VCC = 3.6V
RT= 10kΩ
CT= 330pF
fOSC = 200kHz
100
CT= 150pF
VCC = 5V
Ta = 25
100k 1M
CT= 1500pF
CT= 15000pF
-1
Triangle Waveform Swing Voltage (V)
2.6
101103
102
Triangle Waveform Awing Voltage vs
Timing Capacita nce
Timing Capacitance, CT (pF)
Triangle Wav e fo rm Period (µs)
102
101
Triangle Waveform Period vs
Timing Capacitance
10-1
2
1.4
0.8 104105
100
VCC = 5V
RT = 5.1kΩ
Ta= 25℃
1.2
1
2.4
2.2
1.8
1.6
101103
102104105
VCC = 5V
RT = 5.1kΩ
Ta= 25℃
Timing Capacitance, CT (pF)
30
-20
-25 50 750
10
25
Reference Output Voltage Variation vs
Free-Air Temperature
Free - Air Temperature, Ta (℃)
0
-30
20
100
-10
Reference Output Voltage Var ia tion , ΔVO(REF) (mV)
30
-20
-25 50 750
10
25
Reference Output Voltage Variation vs
Free-Air Temperature
Free - Air Temperature, Ta (℃)
0
-30
20
VCC = 3.6V
II(REF) = 1mA
100
-10
VCC = 40V
II(REF) = 1mA
Reference Output Voltage Var ia tion , ΔVO(REF) (mV)
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 12 of 14
www.unisonic.com.tw QW-R103-011.D
TYPICAL CHARACTERISTICS(Cont.)
1.1
0.6
-25 50 750
0.9
25
Dropout Voltage Variation vs
Free-Air Temperature
Free - Air Temperature, Ta (℃)
0.8
1
100
0.7
Reference Output Voltage, VO(REF) (V)
3
0.5
025
305
2
15
Reference Output Voltage vs Supply Voltage
Supply Voltage, VCC (V)
1.5
0
2.5
40
1
II(REF) = 1mA
Dropout Voltage Vari a tion ( V)
Ta = 25℃
352010
3.5
2
-25 50 750
3
25
Undervoltage Lockout Characteristics
Free - Air Temperature, Ta (℃)
2.5
3.25
100
2.25
Output Collector Voltage, VCE (V)
6
1
03
41
4
2
Undervoltage Lockout Hysteresis
Characteristics
Supply Voltage, VCC (V)
3
0
5
5
2
II(REF) = 1mA
Undervoltage Lockout Threshold Voltage (V)
Ta = 85℃Ta = 20℃
Ta = 25℃
7,12
8
5V
RL
I = IO
VDE
IO =10mA
2.75
Undervoltage Lockout Hystersis Voltage (mV)
300
0
200
100
250
50
150
Threshold Voltage-VTH
(Left Scale)
Threshold Voltage-VTL
(Left Scale)
Threshold Voltage
(Right Scale)
1.10-25 50 750
1.25
25
Short-Circuit Protection Characteristics
Free - Air Temperature, Ta (℃)
1.20
1.30
100
1.15
Compretor Threshold Voltage (V)
RS-Latch Reset Supply Voltage (V)
1
2.5
2
3
1.5
Short-Circuit Pr otection
Latch Reset Suppl y Voltage
(Right Scale)
Short-Cir c uit Protection
Comparator Threshold Voltage
(Left Scale)
G-Gain (dB)
10
0
Gain (Amplfier In Unity-Gain Configuration) vs
Frequency
-20
-10
1k 100k10k 1M 10M
-15
-5
5
Frequency, f (Hz)
VCC = 5V
Ta= 25℃
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 13 of 14
www.unisonic.com.tw QW-R103-011.D
TYPICAL CHARACTERISTICS(Cont.)
Error Amp Maxmum Output Voltage Swing (V)
2.25
1k 100k
10k
Error Amp Maximum Output Voltage Swing vs
Frequency
Frequency, f (Hz)
Open-Loop Voltage Amplification (dB)
90
60
Open-Loop Voltage Amplification vs
Frequency
0
1.5
1.75
01M 10M
30
VCC = 5V
Ta= 25℃
0.5
0.25
2
1.75
1.25
1
100 10k1k 100k 2M1M
10
20
40
50
70
80
Frequency, f (Hz)
VCC = 5V
Ta= 25℃
0020
3010
1.5
Standby Current vs
Supply Voltage
Supply Voltage, VCC (V) 40
Standby Current, ICC (mA)
0.75
Ta = 25 ℃
0.25
0.5
1
1.25
1.75
2
100 02
31
30
Output Transistor on Duty Cycle vs
Dead-Time Input Voltage
Dead-Time Input Voltage (V)
50
0
4
80
Output Transistor “On” Duty Cycle (%)
70
90
60
40
20
10
1.5 2.50.5 3.5
VCC = 3.6V
RT = 10kΩ
CT = 330pF
0-25 25 750
800
Maximum Continuous Pow er Disspation vs
Free-Air Temperature
100
Maximum Continuous Power Dissipation (mW)
400
100
300
500
700
1000
1100
0-25 0
1.5
Standby Current vs
Free-Air Temperature
100
0.5
Supply Curre n t, ICC (mA)
0.75
0.25
1
1.25
1.75
2
25 50 75
Average Supply Current
VCC = 6V, RT = 10kΩ
CT = 330pF
Stand-By Current, VCC = 3.6V, No Load
Stand-By Current, V
CC
= 40V, No Load
Free-Air Temperature, Ta (℃)
Thermal Resistance
125℃/W
DIP-16
SOP-16
Thermal Resistance
250℃/W
50
Free-Air Temperature, Ta (℃)
200
600
900
1200
TL1451 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 14 of 14
www.unisonic.com.tw QW-R103-011.D
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 param eters) l isted in products specif icat ions of any and all UTC products descr ibed or contai ned
herein. UTC products are not designed for use in life support appliances, devices or systems where
m al functi on of these products can be reasonably ex pected to result i n personal inj ury. Reproducti on i n
whole or in part is prohibited without the prior written consent of the copyright owner. The inf ormation
presented in this docum ent does not f orm part of any quotat ion or cont ract, i s beli eved to be accurate
and rel iable and m ay be c hanged without not ice.
