In The Name of GODeen.iust.ac.ir/profs/Abrishamifar/Switching/Course notes 19-9-84...IUST: SMPS 4/26...
Transcript of In The Name of GODeen.iust.ac.ir/profs/Abrishamifar/Switching/Course notes 19-9-84...IUST: SMPS 4/26...
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Switched Mode Power Supply
In The Name of GOD
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Adib AbrishamifarEE Department
IUST
Lecture 14 – PWM Controllers
Switched Mode Power Supply
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 20053/26
Outline
} PWM Controllers} Basic building blocks} Integrated PWM controllers
• TL494 (Texas Instruments)• HA16666/P (Harris)• TC170• UC2(3)84X (Unitrode Corporation)
} Summary
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 20054/26
} Today’s switching power supplies are of the PWM type} This technique varies the conduction time of the
switching transistor during the on period to control and regulate the output voltage to a predetermined value
} Other methods may be used for control and regulation, but the PWM method offers excellent performance, such as tight line and load regulation, and stability during temperature variations
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 20055/26
Outline
} PWM Controllers} Basic building blocks} Integrated PWM controllers
• TL494 (Texas Instruments)• HA16666/P (Harris)• TC170• UC2(3)84X (Unitrode Corporation)
} Summary
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 20056/26
} Basic building blocks
PWM Controllers
EA
Comparator
FFQ
Q
Vref
Osc.
A
Bــدبك ــاژ في ولت
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 20057/26
} Waveforms
w∂ó
‹w•·
Èã‡ûó ‚öŒ „¶ÍwÀ⁄
PWM Controllers
EA
Comparator
FFQ
Q
Vref
Osc.
A
B ــدبك ــاژ في ولت
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 20058/26
Outline
} PWM Controllers} Basic building blocks} Integrated PWM controllers
• TL494 (Texas Instruments)• HA16666/P (Harris)• TC170• UC2(3)84X (Unitrode Corporation)
} Summary
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 20059/26
} Integrated PWM controllers} In recent years, a number of integrated circuits have been
developed which include all the functions necessary to build a PWM SMPS in a single package with just the addition of a few external components for example:
} SG3524 (Silicon General) } TL494 (Texas Instruments)} MC34060 (Motorola)} HA16666/P (Harris)} TC170} UC2(3)84X (Unitrode Corporation)} TOPXXX
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200510/26
Outline
} PWM Controllers} Basic building blocks} Integrated PWM controllers
• TL494 (Texas Instruments)• HA16666/P (Harris)• TC170• UC2(3)84X (Unitrode Corporation)
} Summary
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200511/26
} TL494 (Texas Instruments)
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200512/26
} TL494 (Texas Instruments) Features} Output mode control} Internal reference voltage} Dead time control
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200513/26
} TL494 (Texas Instruments)
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200514/26
Outline
} PWM Controllers} Basic building blocks} Integrated PWM controllers
• TL494 (Texas Instruments)• HA16666/P (Harris)• TC170• UC2(3)84X (Unitrode Corporation)
} Summary
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200515/26
PWM Controllers
} HA16666/P (Harris)
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200516/26
PWM Controllers
} HA16666/P Features} Voltage mode controller} Switching frequency up to 600KHz} Low standby current (less than 0.3mA)} Low rise and fall times (tr = 80ns, tf = 40ns)} Wide width of PWM signal (D < 0.75)} Wide supply range (11 – 40 Volts) } Internal reference voltage } Output Totem pole} Remote control
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200517/26
PWM Controllers
} HA16666/P
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200518/26
Outline
} PWM Controllers} Basic building blocks} Integrated PWM controllers
• TL494 (Texas Instruments)• UC2(3)84X (Unitrode Corporation)• TC170• HA16666/P (Harris)
} Summary
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200519/26
} TC170
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200520/26
} TC170 Features} Current mode controller} Simple compensation} Cycle to cycle current limiting} Low power consumption} Current sense input} Sync input } Two non- overlap outputs} Shutdown input
PWM Controller
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200521/26
Outline
} PWM Controllers} Basic building blocks} Integrated PWM controllers
• TL494 (Texas Instruments)• HA16666/P (Harris)• TC170• UC2(3)84X (Unitrode Corporation)
} Summary
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200522/26
} UC2(3)84X (Unitrode Corporation)
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200523/26
} UC2(3)84X (Unitrode Corporation) Features} Optimized for DC/DC off the line} Low driving current (less than 1mA)} Cycle to cycle current limiting} Under voltage lockout with hysteresis} High current output Totem pole} Internal Band gap reference voltage} Switching frequency up to 500KHz
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200524/26
} UC2(3)84X (Unitrode Corporation)
PWM Controllers
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200525/26
Outline
} PWM Controllers} Basic building blocks} Integrated PWM controllers
• TL494 (Texas Instruments)• HA16666/P (Harris)• TC170• UC2(3)84X (Unitrode Corporation)
} Summary
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IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200526/26
} In this lecture several integrated circuit PWM controllers for control of SMPS were described
Summary