TL1451 Unisonic Technologies, TL1451 Datasheet

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TL1451

Manufacturer Part Number
TL1451
Description
Manufacturer
Unisonic Technologies
Datasheet

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TL1451
DUAL
PULSE-WIDTH-MODULATION
CONTROL CIRCUITS
functions
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.
*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
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., LTD
The UTC TL1451 incorporates on a single monolithic chip all the
ORDERING INFORMATION
DESCRIPTION
FEATURES
TL1451-S16-R
TL1451-P16-R
TL1451-S16-T
TL1451-P16-T
TL1451-D16-T
required
Normal
UNISONIC TECHNOLOGIES CO., LTD
Order Number
in
the
Lead free plating
TL1451L-S16-R
TL1451L-P16-R
TL1451L-D16-T
TL1451L-S16-T
TL1451L-P16-T
construction
TSSOP-16
TSSOP-16
of
Package
SOP-16
SOP-16
DIP-16
two
Tape Reel
Tape Reel
LINEAR INTEGRATED CIRCUIT
Packing
Tube
Tube
Tube
*Pb-free plating product number: TL1451L
TSSOP-16
SOP-16
DIP-16
QW-R103-011,C
1 of 14

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TL1451 Summary of contents

Page 1

... 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 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 – ...

Page 2

... TL1451 PIN CONFIGURATION ERROR AMPLIFIER 1 1 FEEDBACK 1 DTC 1 OUT BLOCK DIAGRAM 11 2 DTC 14 ERROP IN AMPLIFIER 2 IN FEEDBACK 1/2 Vref 5 1 FEEDBACK 12kΩ 15 SCP 3 IN+ ERROP + 4 AMPLIFIER DTC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com ...

Page 3

... TL1451 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Amplifier Input Voltage Collector Output Voltage Collector Output Current Power Dissipation Junction Temperature Operating Temperature Storage Temperature 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. ...

Page 4

... TL1451 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 ...

Page 5

... Output Transistor Collector Waveform Protection Enable Terminal Waveform Short-Circuit Protection Comparator Output Power Supply Voltage = (0.051 × Protection Enable Time UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Test V Input UTC TL1451 10kΩ Test Input 2.8V TYP 6 × ...

Page 6

... Vref UTC TL1451 33kΩ 33kΩ NOTE A: Values for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 470Ω ...

Page 7

... TL1451 TYPICAL CHARACTERISTICS Short-circuit Protection Comparator ERROR AMP 1 ERROR AMP 2 + 1.25V - 150Ω REF 470pF REF Ta = 25℃ Closed-Loop Gain 50 (Left Scale 100 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Protection Enable Time vs Protection Enable Capacitance ...

Page 8

... TL1451 TYPICAL CHARACTERISTICS(cont 15Ω REF 470pF REF Ta = 25℃ 50 Closed-Loop Gain (Left Scale 100 15Ω REF 470pF REF Ta = 25℃ 100 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Closed-Loop Gain and Phase Shift vs Frequency ...

Page 9

... TL1451 TYPICAL CHARACTERISTICS(Cont 470pF REF 60 Ta= 25℃ Closed-Loop Gain (Left Scale 100 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Closed-Loop Gain and Phase Shift vs Frequency 1k 10k Frequency, f (Hz) V REF + - 39kΩ C REF 39kΩ LINEAR INTEGRATED CIRCUIT 0° -10° ...

Page 10

... TL1451 TYPICAL CHARACTERISTICS(Cont rre lle tio lta ℃ ℃ ...

Page 11

... TL1451 TYPICAL CHARACTERISTICS Triangle Oscillator Frequency vs Timing Resistance 150pF T 100k C = 1500pF T 10k C = 15000pF 10k 40k 100k Timing Resistance, R Triangle Waveform Awing Voltage vs Timing Capacitance 2.6 2.4 2.2 2 1.8 1.6 1.4 1 Timing Capacitance, C Reference Output Voltage Variation vs Free-Air Temperature 3. 1mA ...

Page 12

... TL1451 TYPICAL CHARACTERISTICS(Cont.) Reference Output Voltage vs Supply Voltage 25℃ 2.5 2 1 Supply Voltage, V Undervoltage Lockout Hysteresis Characteristics 25℃ 20℃ 85℃ 7, =10mA Supply Voltage Short-Circuit Protection Characteristics 1 ...

Page 13

... TL1451 TYPICAL CHARACTERISTICS(Cont.) Error Amp Maximum Output Voltage Swing vs Frequency 2. 25℃ 1.75 1.5 1.25 1 1.75 0.5 0. 10k 100k Frequency, f (Hz) Output Transistor on Duty Cycle vs Dead-Time Input Voltage 3. 10kΩ 330pF 100 0 0.5 1 1.5 2 2.5 Dead-Time Input Voltage (V) ...

Page 14

... TL1451 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 ...

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