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UNISONIC TECHNOLOGIES CO., LTD TL1451
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.
LINEAR INTEGRATED CIRCUIT
SOP-16
DIP-16
TSSOP-16
*Pb-free plating product number: TL1451L
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
Order Number Normal Lead free plating TL1451-S16-R TL1451L-S16-R TL1451-S16-T TL1451L-S16-T TL1451-P16-R TL1451L-P16-R TL1451-P16-T TL1451L-P16-T TL1451-D16-T TL1451L-D16-T Package SOP-16 SOP-16 TSSOP-16 TSSOP-16 DIP-16 Packing Tape Reel Tube Tape Reel Tube Tube
www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., LTD
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TL1451
PIN CONFIGURATION
CT RT ERROR AMPLIFIER 1 1 IN+ 1 IN-
LINEAR INTEGRATED CIRCUIT
1 2 3 4 5 6 7 8
16 15
REF SCP ERROR AMPLIFIER 2
14 2 IN+ 13 2 IN12 11 10 9
1 FEEDBACK 1 DTC 1 OUT GND
2 FEEDBACK 2 DTC 2 OUT Vcc
BLOCK DIAGRAM
VCC RT 9 2 CT 1
2 DTC
11
ERROP AMPLIFIER 2
14 IN+ + 13 IN12 2 FEEDBACK 5 1 FEEDBACK SCP 15
10 PWM COMP 16
2 OUTPUT
1/2 Vref
Oscillator Regerence Voltage 170 k UVLO R
12k
REF
R S
ERROP AMPLIFIER 1
IN+ IN-
3 4
+ PWM COMP
7
1 OUTPUT
1 DTC
6 8 GND
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PARAMETER Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25C, unless otherwise specified)
VALUE UNIT 51 V 20 V 51 V 21 mA DIP-16 1000 mW Power Dissipation PD SOP-16 500 TSSOP-16 700 Junction Temperature TJ +125 C Operating Temperature TOPR -20 ~ +85 C Storage Temperature TSTG -40 ~ +150 C Note 1. 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. 2. The device is guaranteed to meet performance specification within 0 ~+70 operating temperature range and assured by design from -20 ~ +85 . 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 15000 100 500 85 UNIT V V V mA A k pF k kHz C
100 150 5.1 1 -20
ELECTRICAL CHARACTERISTICS(VCC=6V, f=200kHz, Ta=25C, unless otherwise specified.)
PARAMETER Reference Section Output Voltage Output Voltage Change with Temperature Input Voltage Regulation Output Voltage Regulation Short-Circuit Output Current Undervoltage Lockout Section Threshold Voltage (Vcc) Upper Lower VIN VOUT IOUT VTHR VHYS IOUT(REF)=0.1mA 80 1.5 0.65 140 -10 SYMBOL VOUT TEST CONDITIONS IOUT=1mA Ta= -20C ~ 25C Ta= 25C ~ 85C Vcc=3.6V ~ 40V IOUT=0.1mA ~ 1mA VOUT=0 MIN 2.4 TYP 2.5 -0.1 -0.2 2 1 10 2.72 2.6 120 1.9 0.7 185 60 -15 1.18 0.75 230 120 -20 MAX 2.6 1 1 12.5 7.5 30 UNIT V % mV mV mA V V mV V V mV mV A V
3
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)
VIN(THR) VSTN-BY VIN(LAT) IIN(source) VTHR
No pullup No pullup VIN=0.7V
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ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER Oscillator Section Frequency Standard deviation of frequency Frequency Change with Voltage Frequency Change with Temperature Dead-Time Control Section Input bias Current (DTC) Latch mode (source) Current (DTC) Latched Input Voltage (DTC) Input threshold Voltage at f=10kHz (DTC) Error-Amplifier Section Input Offset Voltage Input Offset Current Input Bias current Common-Mode Input Voltage Range 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 SYMBOL F
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS CT=330pF, RT=10k CT=330pF, RT=10k Vcc=3.6V ~ 40V TA=-20C ~ 25C TA=25C ~ 85C
MIN
TYP 200 10% 1% -0.4 -0.2
MAX
UNIT kHz
2 2 1
% A A V V
IIN(BIAS) VIN VIN(THR) IOUT=40A Zero duty cycle Maximum duty cycle VOUT (FEEDBACK)=1.25V VOUT (FEEDBACK)=1.25V VOUT (FEEDBACK)=1.25V Vcc=3.6V ~ 40V RF=200k BG RR VOUT VOUT IOUT(SIN) IOUT(SOU) IOFF VOUT(SAT) IOUT(SHT) VID=-0.1V, VOUT=1.25V VID=0.1V, VOUT=1.25V VOUT=50V IOUT=10mA VOUT=6V Zero duty cycle Maximum duty cycle Off-state RT=10k 1. 05~ 1.45 70 60 Vref-0.1 0.5 -45 -80 2.3 1.2 -145 2.05 1.45
2.25
VIN(OFF) IIN(OFF) IIN(BIAS) VIN(CM)
160
6 100 500
mV nA nA V
80 1.5 80 1 1.6 -70 10 2
dB MHz dB V V mA A A V mA
1.2 90 2.05 1.45 1.3 1.7
VI(THR)
2.25
1.2
V
ISTN-BY
1.8 2.4
mA mA
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TEST CIRCUIT
S1 CPE F Test Input
LINEAR INTEGRATED CIRCUIT
VCC = 5V
RL 4.7k OUT1
0.47
16 15 14 13 12 11 10 9
RL 4.7k
OUT2
UTC TL1451
1
2
3
4
5
6
7
8
CT 330pF
RT 10k Test Input
TIMING DIAGRAM
Oscillator Triangle Waveform Error Amplifier Output Dead-Time Input Voltage Short-Circuit Protection Comparator Input Voltage PWM Comparator Output Voltage
2.0V 1.6V 1.4V 1.25V
H L Dead Time 100% H L 0.6V
Output Transistor Collector Waveform Protection Enable Terminal Waveform Short-Circuit Protection Comparator Output Power Supply Voltage * Protection Enable Time, tpe = (0.051 106
2.8V TYP
0V
Tpe*
H L 3.6V 0V Cpe) in seconds
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APPLICATION INFORMATION
LINEAR INTEGRATED CIRCUIT
HIGH-SPEED DUAL SWITCHING REGULATOR
VCC 220k 470 150 L1
0.47 F
50k 33k 33k C1 500pF R1 R2
33k
330pF R3 C2 Step-Up Output
33k
R4
Vref
16 15 14 13 12 11 10 9 UTC TL1451 1 2 3 4 5 6 7 8 470 C5 R5 500pF 33k 33k 470 220 470 1F L2 R6 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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TYPICAL CHARACTERISTICS
18 Protection Enable Time, tpe (s) 15 12 9 6 3 0
LINEAR INTEGRATED CIRCUIT
Protection Enable Time vs Protection Enable Capacitance
0 150 250 50 200 100 Protection Enable Capacitance, CPE ( F)
SCP 15
VREF
16 170k
VREF
VREF
Short-circuit Protection Comparator ERROR AMP 1 ERROR AMP 2 + 1.25V -
12k CPE
S R Protection Latch
U.V.L.O.
Closed-Loop Gain and Phase Shift vs Frequency
70 60 Closed-Loop Gain (dB) 50 40 30 20 10 0 100 1k 10k 100k 1M VCC = 5V RREF = 150 CREF = 470pF Ta = 25 CX: 47pF 470pF 4700pF
Closed-Loop Gain (Left Scale)
Phase Shift (Right Scale) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 Phase Shift
Frequency, f (Hz)
VREF 39k 39k CX
+ -
RREF CREF
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TYPICAL CHARACTERISTICS(cont.)
LINEAR INTEGRATED CIRCUIT
Closed-Loop Gain and Phase Shift vs Frequency
70 60 Closed-Loop Gain (dB) 50 40 30 20 10 0 100 1k 10k 100k 1M VCC = 5V RREF = 15 CREF = 470pF Ta = 25 CX: Phase Shift (Right Scale) 47pF 470pF 4700pF
-50 -60 -70 -80 -90
Frequency, f (Hz)
VREF 39k 39k CX
+ -
RREF CREF
Closed-Loop Gain and Phase Shift vs Frequency
70 60 Closed-Loop Gain (dB) 50 40 30 20 10 0 100 1k 10k 100k 1M VCC = 5V RREF = 15 CREF = 470pF Ta = 25 CX: Phase Shift (Right Scale) 47pF 470pF 4700pF
Closed-Loop Gain (Left Scale)
0 -10 -20 -30 -40 -50 -60 -70 -80 -90
Frequency, f (Hz)
VREF 39k 39k CX
+ -
RREF CREF
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Phase Shift
QW-R103-011,C
Phase Shift
Closed-Loop Gain (Left Scale)
0 -10 -20 -30 -40
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TL1451
TYPICAL CHARACTERISTICS(Cont.)
LINEAR INTEGRATED CIRCUIT
Closed-Loop Gain and Phase Shift vs Frequency
70 60 Closed-Loop Gain (dB) 50 40 30 20 10 0 100 1k 10k 100k 1M Closed-Loop Gain (Left Scale) Phase Shift (Right Scale) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 Phase Shift VCC = 5V CREF = 470pF Ta= 25
Frequency, f (Hz)
VREF 39k 39k
+ -
CREF
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TYPICAL CHARACTERISTICS(Cont.)
O u tp u t S in k C u rre n t v s C o lle c to r O u tp u t S a tu ra tio n V o lta g e
120 110 100 Output Sink Current (mA) 90 80 70 60 50 40 30 20 10 0 0 5 10 V C C = 3 .6 V 15 20 T a = -2 0 Ta = 25 Ta = 85
LINEAR INTEGRATED CIRCUIT
C o lle cto r O u tp u t S a tu ra tio n V o lta g e (V )
Maximum Output Voltage Swing vs Free-Air Temperature
VO (REF) -0.01 Maximum Output Voltage Swing, VOM (V) VO (REF) -0.02 VO (REF) -0.03 VO (REF) -0.04 VO (REF) -0.05 VO (REF) -0.06 VO (REF) -0.07 -25 Maximum Output Voltage Swing (Right Scale) Maximum Output Voltage Swing (Right Scale) 1 Maximum Output Voltage Swing, VOM (V) 0.9 0.8 0.7 0.6 0.5 VREF 33k
+
33k
-
RL Vvom - 1 100k VCC = 3.6V RL = 100k VOM+1 = 1.25V VOM-1 = 1.15V (Right Scale) VOM-1 = 1.35V (Left Scale)
0
25
50
75
100
Free-Air Temperature, Ta ( )
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TYPICAL CHARACTERISTICS
Triangle Oscillator Frequency vs Timing Resistance
1M Triangle Oscillator Frequency, tOSC (Hz) fOSC ( ) VCC = 5V Ta = 25 CT = 150pF 100k
LINEAR INTEGRATED CIRCUIT
Oscillator Frequency Variation vs Free-Air Temperature
3 2 1 0 -1 -2 VCC = 3.6V RT = 10k CT = 330pF fOSC = 200kHz
CT = 1500pF 10k
CT = 15000pF 1k 1k 4k 10k 40k 100k 400k 1M
Oscillator Frequency Variation,
-3 -25 0 25 50 75 100
Timing Resistance, RT ( )
Triangle Waveform Awing Voltage vs Timing Capacitance
2.6 Triangle Waveform Swing Voltage (V) 2.4 2.2 2 1.8 1.6 1.4 1.2 1 0.8 101 102 103 104 105 10-1 101 VCC = 5V RT = 5.1k Ta = 25
Free - Air Temperature, Ta ( )
Triangle Waveform Period vs Timing Capacitance
VCC = 5V RT = 5.1k Ta = 25
102 Triangle Waveform Period ( s)
101
100
102
103
104
105
Timing Capacitance, CT (pF)
Timing Capacitance, CT (pF)
VO(REF) (mV)
30 20 10 0 -10 -20
VO(REF) (mV)
Reference Output Voltage Variation vs Free-Air Temperature
VCC = 3.6V II(REF) = 1mA
Reference Output Voltage Variation vs Free-Air Temperature
30 20 10 0 -10 -20 VCC = 40V II(REF) = 1mA
Reference Output Voltage Variation,
-30 -25 0 25 50 75 100
Reference Output Voltage Variation,
-30 -25 0 25 50 75 100
Free - Air Temperature, Ta (
)
Free - Air Temperature, Ta (
)
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TYPICAL CHARACTERISTICS(Cont.)
Reference Output Voltage vs Supply Voltage
3 Reference Output Voltage, VO(REF) (V)
LINEAR INTEGRATED CIRCUIT
Dropout Voltage Variation vs Free-Air Temperature
1.1 II(REF) = 1mA Dropout Voltage Variation (V) 1 0.9 0.8 0.7 0.6
Ta = 25
2.5 2 1.5 1 0.5 0 0 5 10 15 20 25 30 35 40
-25
0
25
50
75
100
Supply Voltage, VCC (V)
Undervoltage Lockout Hysteresis Characteristics Ta = 85
Output Collector Voltage, VCE (V) 5 4 3 2
7,12 8
Free - Air Temperature, Ta ( )
Undervoltage Lockout Characteristics
II(REF) = 1mA 3.25 3 2.75 2.5 2.25 2 Threshold Voltage (Right Scale) Threshold Voltage-VTH (Left Scale) Threshold Voltage-VTL (Left Scale) 250 200 150 100 50 0 Undervoltage Lockout Hystersis Voltage (mV) Undervoltage Lockout Threshold Voltage (V) 3.5 300
6
Ta = 25
Ta = 20
5V RL I = IO VDE
1
IO =10mA
0 0 1 2 3 4 5
-25
0
25
50
75
100
Supply Voltage, VCC (V)
Free - Air Temperature, Ta ( )
Short-Circuit Protection Characteristics
RS-Latch Reset Supply Voltage (V) 1.30 3
Gain (Amplfier In Unity-Gain Configuration) vs Frequency
10 VCC = 5V Ta = 25
Compretor Threshold Voltage (V)
5 0 G-Gain (dB) -5 -10 -15 -20 1k 10k 100k 1M 10M
1.25
Short-Circuit Protection Latch Reset Supply Voltage (Right Scale)
2.5
1.20
2
1.15
Short-Circuit Protection Comparator Threshold Voltage (Left Scale)
1.5
1.10 -25 0 25 50 75 100
1
Free - Air Temperature, Ta ( )
Frequency, f (Hz)
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TYPICAL CHARACTERISTICS(Cont.)
Error Amp Maximum Output Voltage Swing vs Frequency
Error Amp Maxmum Output Voltage Swing (V) 2.25 2 1.75 1.5 1.25 1 1.75 0.5 0.25 0 1k 10k 100k 1M 10M Open-Loop Voltage Amplification (dB) VCC = 5V Ta = 25
LINEAR INTEGRATED CIRCUIT
Open-Loop Voltage Amplification vs Frequency
90 80 70 60 50 40 30 20 10 0 100 1k 10k 100k 1M 2M VCC = 5V Ta = 25
Frequency, f (Hz)
Frequency, f (Hz)
Output Transistor on Duty Cycle vs Dead-Time Input Voltage
0 Duty Cycle ( ) 10 20 30 40 On 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 4 VCC = 3.6V RT = 10k CT = 330pF Ta = 25 2 Standby Current, ICC (mA) 1.75 1.5 1.25 1 0.75 0.5 0.25 0 0
Standby Current vs Supply Voltage
Output Transistor
10
20
30
40
Dead-Time Input Voltage (V)
Supply Voltage, VCC (V)
Standby Current vs Free-Air Temperature
Maximum Continuous Power Dissipation (mW) 2 Supply Current, ICC (mA) 1.75 1.5 1.25 1 0.75 0.5 0.25 0 -25 0 25 50 75 100 Stand-By Current, VCC = 3.6V, No Load Average Supply Current VCC = 6V, RT = 10k CT = 330pF
Stand-By Current, VCC = 40V, No Load
Maximum Continuous Power Disspation vs Free-Air Temperature
1200 1100 1000 900 800 700 600 500 400 300 200 100 0 -25 0 25 50 75 100 Thermal Resistance 250 /W SOP-16
DIP-16 Thermal Resistance 125 /W
Free-Air Temperature, Ta ( )
Free-Air Temperature, Ta ( )
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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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