Offline Controllers | NCP1239

用于反激转换器的固定频率电流模式控制器，带高电压启动

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概览

NCP1239 是一款固定频率电流模式控制器，具有动态自供电功能。此功能可激活内部启动电流源使其在启动期间、瞬变、锁存、待机等期间为控制器供电，大大简化了辅助电源和 Vcc 电容器的设计。 该控制器供电范围高达 35 V，具有带抖动的 65 kHz 或 100 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，同时对峰值电流进行限制，确保轻型负载条件下的卓越能效。 它具有基于计时器的故障检测可确保过载检测，还具有可调节补偿，有助于保持最大功率，而无论输入电压如何。

  • Auxiliary Power
  • Industrial Power
  • AC/DC Power Adapters
  • Set-top Box
  • Fixed-frequency 65-kHz or 100-kHz current-mode control operation
  • Frequency foldback down to 26 kHz and skip mode
  • Adjustable Over Power Protection (OPP) circuit
  • High-voltage Current Source with Brown-out (BO) detection
  • Internal ramp compensation
  • Internal fixed 8-ms soft-start
  • Frequency jittering in normal and frequency foldback modes
  • 64-ms timer-based short-circuit protection with auto-recovery or latched operation
  • Pre-short ready
  • Latched OVP on Vcc (NCP1239 A & B versions)
  • Latched OVP/OTP input for improved robustness
  • 35-V Vcc operation
  • +500 mA/ -500 mA peak source/sink drive capability
  • Internal thermal shutdown
  • Extremely low no-load standby power
  • Pin-to-pin compatible with the existing NCP1236/1247 series

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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

NCP1239AD100R2G

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Pb

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SOIC-7

751U

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260

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2500

Y

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Current Mode

100

Yes

8

Yes

Yes

Yes

35

500 / 500

$0.3419

More Details

NCP1239AD65R2G

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Pb

A

H

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SOIC-7

751U

1

260

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2500

N

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65

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Yes

Yes

Yes

35

500 / 500

$0.3398

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NCP1239BD100R2G

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Pb

A

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SOIC-7

751U

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260

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2500

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Yes

35

500 / 500

$0.3419

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NCP1239BD65R2G

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SOIC-7

751U

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260

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2500

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$0.3419

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NCP1239CD65R2G

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SOIC-7

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NCP1239DD100R2G

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NCP1239DD65R2G

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$0.3419

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NCP1239ED100R2G

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NCP1239ED65R2G

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751U

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2500

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NCP1239FD65R2G

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NCP1239GD100R2G

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NCP1239HD65R2G

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$0.3419

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NCP1239ID65R2G

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$0.3368

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NCP1239JD65R2G

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NCP1239KD65R2G

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$0.3447

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NCP1239LD65R2G

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NCP1239MD65R2G

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$0.3405

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NCP1239ND65R2G

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NCP1239PD65R2G

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$0.3425

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NCP1239QD65R2G

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NCP1239RD65R2G

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35

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$0.322

More Details

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