Offline Controllers | NCP1377
概览
NCP1377 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 NCP1377，一个内部 8.0µs 计时器可防止空转频率超过 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 NCP1377B, 内部计时器持续时间则降至 3.0µs，允许在更高频率下运行。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。1377 的采样时间为 4.5µs，B 版本的采样时间为 1.5µs。NCP1377 还具有有效保护电路，如果发生过电流情况，则会禁用输出脉冲，进入安全突发模式，尝试重启。一旦故障清除，器件自动恢复。最后，内部 1ms 软启动避免了传统的启动压力。
- AC/DC adapters for notebooks etc.
- Offline battery chargers
- Consumer electronics (DVD players, set-top boxes, TVs, etc.)
- Auxiliary power supplies (USB, appliances, TVs etc.)
- Free-running borderline / critical mode quasi-resonant operation
- Latched Over Voltage Protection
- Auto-recovery short-circuit protection via UVLO crossover
- External latch triggering, e.g. via over-temperature signal
- Current-Mode with adjustable Skip-cycle capability
- Internal 1ms soft-start
- Internal temperature shutdown
- Internal Leading Edge Blanking
- 500mA peak current source/sink capability
- Under Voltage Lockout level of 12.5V (on) and 7.5V (min)
- Direct optocoupler connection
- SPICE models available for TRANsient analysis
- Internal minimum TOFF
- Auxiliary power supplies (USB, appliances, TVs etc.)
- Pb-Free Packages are Available
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Pb
A
H
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SOIC-8
1
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Pb
A
H
P
PDIP-8
NA
0
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50
No
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Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
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Pb
A
H
P
SOIC-7
1
260
REEL
2500
No
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
Last Shipments
Pb
A
H
P
SOIC-8
1
260
REEL
2500
No
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
已停产
Pb
A
H
P
PDIP-8
NA
0
TUBE
50
No
Flyback
Current Mode
Variable
Yes
Yes
No
Yes
Yes
16
500 / 500
Price N/A
More Details
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