Offline Controllers | UC3845B

高性能电流模式 PWM 控制器

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概览

UC3842B、UC3843B 系列为高性能固定频率电流模式控制器。此类器件专门针对离线和 DC-DC 转换器应用而设计，为设计人员提供了外部部件极少的成本高效方案。这些集成电路具有振荡器、温度补偿参考、高增益误差放大器、电流传感比较器和高电流图腾柱输出，适用于驱动功率 MOSFET。还包括了保护功能，有输入和参考欠压锁定且均具有迟滞、按周期电流限制、用于单脉冲计量的锁存，以及每隔一个振荡器周期即对输出进行间隔关断的触发器，可将输出停滞时间编程为 50% 到 70%。此类器件采用 8 引脚双列直插和表面贴装 (SO-8) 塑料封装以及 14 引脚塑料表面贴装 (SO-14) 封装。SO-14 封装具有单独的电源和接地引脚用于图腾柱输出级。UCX844B 的 UVLO 阈值为 16 V（开）和 10 V（关），适用于离线转换器。UCX845B 针对 UVLO 阈值为 8.5 V（开）和 7.6 V（关）的低电压阈值而量身定制。

  • Trimmed Oscillator for Precise Frequency Control
  • Oscillator Frequency Guaranteed at 250 kHz
  • Current Mode Operation to 500 kHz Output Switching Frequency
  • Output Deadtime Adjustable from 50% to 70%
  • Automatic Feed Forward Compensation
  • Latching PWM for Cycle-By-Cycle Current Limiting
  • Internally Trimmed Reference with Undervoltage Lockout
  • High Current Totem Pole Output
  • Undervoltage Lockout with Hysteresis
  • Low Startup and Operating Current
  • Pb-Free Packages are Available

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状态

CAD Models

Compliance

Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

Topology

Control Mode

fsw Typ (kHz)

Stand-by Mode

UVLO (V)

Short Circuit Protection

Latch

Soft Start

VCC Max (V)

Drive Cap. (mA)

Reference Price

UC3845BD1G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-8

751-07

1

260

TUBE

98

N

Step-Up

Current Mode

52

No

Yes

Yes

No

No

25

200 / 200

$0.2565

More Details

UC3845BD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-8

751-07

1

260

REEL

2500

N

Step-Up

Current Mode

52

No

Yes

Yes

No

No

25

200 / 200

$0.2504

More Details

UC3845BDG

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-14

751A-03

1

260

TUBE

55

N

Step-Up

Current Mode

52

No

Yes

Yes

No

No

25

200 / 200

Price N/A

More Details

UC3845BDR2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-14

751A-03

1

260

REEL

2500

N

Step-Up

Current Mode

52

No

Yes

Yes

No

No

25

200 / 200

$0.4076

More Details

UC3845BNG

Loading...

Active

CAD Model

Pb

A

H

P

PDIP-8

626-05

NA

0

TUBE

50

N

Step-Up

Current Mode

52

No

Yes

Yes

No

No

25

200 / 200

$0.3988

More Details

UC3845BVD1G

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-8

751-07

1

260

TUBE

98

N

Step-Up

Current Mode

52

No

Yes

Yes

No

Yes

25

200 / 200

Price N/A

More Details

UC3845BVD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-8

751-07

1

260

REEL

2500

N

Step-Up

Current Mode

52

No

Yes

Yes

No

Yes

25

200 / 200

$0.2589

More Details

UC3845BVDG

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-14

751A-03

1

260

TUBE

55

N

Step-Up

Current Mode

52

No

Yes

Yes

No

Yes

25

200 / 200

Price N/A

More Details

UC3845BVDR2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-14

751A-03

1

260

REEL

2500

N

Step-Up

Current Mode

52

No

Yes

Yes

No

Yes

25

200 / 200

$0.3968

More Details

UC3845BVNG

Loading...

Obsolete

CAD Model

Pb

A

H

P

PDIP-8

626-05

NA

0

TUBE

50

N

Step-Up

Current Mode

52

No

Yes

Yes

No

Yes

25

200 / 200

Price N/A

More Details

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