Offline Controllers | NCP1207B

PWM 控制器，空转准谐振电流模式

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NCP1207A/B 组合了真正的电流模式调制器和去磁化检测器，确保了任何负载/线路条件下的完全边界/临界导通模式，且具有最小的漏极电压开关（准谐振运行）。由于其内在的跳过周期功能，该控制器可在电源要求降至预先确定的水平后立即进入突发模式。因为这发生在低峰值电流处，所以不会听到噪声。对于 NCP1207A，一个内部 8.0 微秒计时器可防止空转频率超过 125 kHz（因此低于 150 kHz CISPR-22 EMI 启动限值），而跳过调节功能则使得用户能够选择突发折回发生的频率。对于 NCP1207B，内部计时器持续时间则降至 4.5 微秒，允许在更高频率下运行（最高可达 200 kHz）。动态自供电 (DSS) 大大简化了变压器设计，无需使用辅助绕组来为 NCP1207A/B 供电。 此功能对于输出电压在运行期间会发生变化的应用尤其有用（如电池充电器）。由于其高电压技术，该集成电路直接联接高电压直流轨。因此，短路跳闸点不取决于任何 VCC 辅助电平。 变压器核芯重置检测使用专用引脚实现的辅助绕组完成，还能实现快速过电压保护 (OVP)。一旦检测到 OVP，该集成电路则会永久性锁存关断。 最后，使用过电流故障保护电路 (OCP) 实施的连续反馈信号监控使得最终设计坚固可靠。

  • Auxiliary power supplies
  • AC/DC adapters for notebook
  • Offline battery chargers
  • Free-Running Borderline/Critical Mode Quasi-Resonant Operation
  • Current-Mode with Adjustable Skip-Cycle capability
  • Auto-Recovery Over Current Protection
  • 500 mA Peak Current Source/Sink Capability
  • Internal 1.0 ms SoftStart
  • Internal 4.5 s Minimum TOFF
  • Latched Over Voltage Protection

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NCP1207BDR2G

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A

H

P

SOIC-7

751U

1

260

REEL

2500

N

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Yes

Yes

Yes

Yes

18

500 / 500

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