UC3843

現行

具有 8.4V/7.6V UVLO 100% 工作週期、0C 至 70C 的單端 500KHz 電流模式 PWM 控制器

立即訂購

產品規格表

document-pdfAcrobat UCx84x Current-Mode PWM Controllers datasheet (Rev. H) (英文) PDF | HTML

UC3843

現行

產品規格表

立即訂購

產品詳細資料

Topology

Boost, Buck, Buck boost, Flyback, Forward

Control mode

Peak current mode

Features

Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology

Duty cycle (max) (%)

100

Sector

Test & measurement

Topology

Boost, Buck, Buck boost, Flyback, Forward

Control mode

Peak current mode

Features

Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology

Duty cycle (max) (%)

100

Sector

Test & measurement

SOIC (D)

8

29.4 mm² (4.9 mm × 6 mm)

PDIP (P)

8

92.5083 mm² (9.81 mm × 9.43 mm)

SOIC (D)

14

51.9 mm² (8.65 mm × 6 mm)

Optimized for off-line and DC-to-DC converters
Low start-up current (< 1mA)
Automatic feedforward compensation
Pulse-by-pulse current limiting
Enhanced load-response characteristics
Undervoltage lockout with hysteresis
Double-pulse suppression
High-current totem-pole output
Internally trimmed bandgap reference
Up to 500kHz operation
Error amplifier with low output resistance

Optimized for off-line and DC-to-DC converters
Low start-up current (< 1mA)
Automatic feedforward compensation
Pulse-by-pulse current limiting
Enhanced load-response characteristics
Undervoltage lockout with hysteresis
Double-pulse suppression
High-current totem-pole output
Internally trimmed bandgap reference
Up to 500kHz operation
Error amplifier with low output resistance

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, designed for driving N-channel MOSFETs, is low when the output stage is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, designed for driving N-channel MOSFETs, is low when the output stage is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

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UC3843A

現行

具有 8.4V/7.6V UVLO 100% 工作週期、0°C 至 70°C 的 30-V、1A、500KHz 電流模式 PWM 控制器 Pin-to-pin equivalent with reduced startup current

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TL2843B

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現行

工業用 30-V、低功耗電流模式 PWM 控制器、8.4-V/7.6-V UVLO、100% 工作週期 Lower startup and supply current, better reference voltage accuracy and faster overcurrent protection

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現行

具有 8.4V/7.6V UVLO 100% 工作週期、-40C 至 85C 的經濟型單端 500KHz 電流模式 PWM 控制器 Wider temperature range

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重要文件	類型	標題	格式選項	日期
*	資料表	UCx84x Current-Mode PWM Controllers datasheet (Rev. H)	PDF \| HTML	2024/10/11
	應用說明	Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A)	PDF \| HTML	2021/6/11
	應用說明	Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B)		2019/3/12
	選擇指南	Power Management Guide 2018 (Rev. R)		2018/6/25
	技術文章	When should you use PWM controllers?	PDF \| HTML	2016/12/2
	應用說明	UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers		2002/2/7
	應用說明	DN-65 Considerations in Powering BiCMOS ICs		1999/9/5
	應用說明	DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802		1999/9/5
	應用說明	DN-27 UC1842/UC1842A Family - Summary of Functional Differences		1999/9/5
	應用說明	DN-43 Simple Techniques to Generate a Negative Voltage Bias Supply		1999/9/5
	應用說明	DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit		1999/9/5
	應用說明	DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty		1999/9/5
	應用說明	U-111, Practical Considerations in Current Mode Power Supplies		1999/9/5
	應用說明	U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control		1999/9/5
	應用說明	Understanding Buck Power Stages In Switchmode Power Supplies		1999/3/4
	應用說明	Understanding Boost Power Stages In Switchmode Power Supplies		1999/3/4