Offline Controllers | NCP1249

PWM 控制器，具有峰值功率偏移和高电压启动功能

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概览

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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CAD Model

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P

SOIC-9 NB

751BP

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

35

300 / 500

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NCP1249BD65R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-9 NB

751BP

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

35

300 / 500

Price N/A

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NCP1249CD65R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-9 NB

751BP

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

751BP

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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