Switched Mode Power Supply

In The Name of GOD

Adib AbrishamifarEE Department

IUST

Lecture 14 – PWM Controllers

Switched Mode Power Supply

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

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

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

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

IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 20057/26

} Waveforms

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PWM Controllers

EA

Comparator

FFQ

Q

Vref

Osc.

A

B ــدبك ــاژ في ولت

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

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

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

IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200511/26

} TL494 (Texas Instruments)

PWM Controllers

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

IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200513/26

} TL494 (Texas Instruments)

PWM Controllers

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

IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200515/26

PWM Controllers

} HA16666/P (Harris)

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

IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200517/26

PWM Controllers

} HA16666/P

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

IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200519/26

} TC170

PWM Controllers

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

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

IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200522/26

} UC2(3)84X (Unitrode Corporation)

PWM Controllers

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

IUST: SMPS LECTURE 14: PWM ControllersLECTURE 14: PWM Controllers Adib Abrishamifar 200524/26

} UC2(3)84X (Unitrode Corporation)

PWM Controllers

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

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