PWM 控制器,具有峰值功率偏移和高电压启动功能

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NCP1249 是一款高度集成的高电压 PWM 控制器,可提供耐用的高性能离线电源,无负载功耗极低。该控制器供电范围高达 30 V,具有带抖动的 65 kHz 开关电路,在峰值电流模式控制下运行。当辅助侧功率开始降低时,该控制器将其开关频率自动折回至最低 26 kHz 的水平。当功率进一步下降时,该零部件进入跳过周期,同时固定峰值电流设定点。为了帮助构建耐用的转换器,该控制器具有若干重要的保护特性:内部欠压,不受输入电压影响的恒定最大输出电流的无耗散超功率保护,通过专用引脚或 Vcc 输入实现的两个锁存过电压保护输入。控制器架构配置为在电流设定值达到极限时允许瞬变峰值功率偏移。此时,开关频率由 65 kHz 增至 130 kHz,直到峰值需求消失。然后,当转换器越过峰值功率偏移模式(长)或发生短路(短)时,对计时器持续时间进行调制。 与集成高电压启动的 NCP1255 和 NCP1254 类似,NCP1249 提供有效导通 (A&B) 和有效关断 (C&D) 版本。

  • Ac-Dc Adapters
  • Notebook Adapters
  • Printer Power Supplies
  • Integrated High Voltage startup
  • 65kHz operating frequency with 130kHz Frequency Excursion
  • Internal and Adjustable Over Power Protection (OPP) Circuit
  • Adjustable Brown-Out Protection
  • Frequency Foldback down to 26 kHz and Skip-cycle in light load conditions
  • Adjustable Timer-based Auto-recovery Overload/Short-circuit protection with 100% to 25% timer reduction for short-circuit faults
  • Frequency Jittering in Normal and Frequency Foldback Modes
  • Latch Input
  • Double Vcc hiccup in fault mode

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NCP1249AD65R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

35

300 / 500

Price N/A

More Details

NCP1249BD65R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

35

300 / 500

Price N/A

More Details

NCP1249CD65R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

35

300 / 500

Price N/A

More Details

NCP1249DD65R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

35

300 / 500

Price N/A

More Details

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